{"id":"CVE-2021-46987","aliases":["DEBIAN-CVE-2021-46987","DLA-4327-1","EUVD-2021-33635","GHSA-85xw-cv8g-9227","OESA-2024-1298","OESA-2024-1299","OESA-2024-1300","OESA-2024-1301","ROOT-OS-DEBIAN-11-CVE-2021-46987","SUSE-SU-2025:02846-1","UBUNTU-CVE-2021-46987"],"status":"published","title":"btrfs: fix deadlock when cloning inline extents and using qgroups","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock when cloning inline extents and using qgroups\n\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\n\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination's inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\").\n\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode's iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\n\nWhen this issue happens, stack traces like the following are reported:\n\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\n\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\n\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---","severity":{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.00181,"percentile":0.0777,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-667"],"published":"2024-02-28T08:13:14Z","modified":"2026-11-11T09:37:07Z","fixes":[{"ecosystem":"Debian:12","package":"linux","fixed_in":["5.14.6-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"linux","fixed_in":["5.14.6-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["5.14.6-1"],"sources":["osv"]},{"ecosystem":"Root:Debian:11","package":"linux","fixed_in":["5.10.262-1.aikido.113","5.10.262-1.aikido.114"],"sources":["osv"]},{"ecosystem":"Root:Debian:11","package":"rootio-linux","fixed_in":["5.10.262-1.aikido.113","5.10.262-1.aikido.114"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Debian:12","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.14.6-1"}]}]},{"source":"osv","ecosystem":"Debian:11","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.244-1"}]}],"versions":["5.10.103-1","5.10.103-1~bpo10+1","5.10.106-1","5.10.113-1","5.10.120-1","5.10.120-1~bpo10+1","5.10.127-1","5.10.127-2","5.10.127-2~bpo10+1","5.10.136-1","5.10.140-1","5.10.148-1","5.10.149-1","5.10.149-2","5.10.158-1","5.10.158-2","5.10.162-1","5.10.178-1","5.10.178-2","5.10.178-3","5.10.179-1","5.10.179-2","5.10.179-3","5.10.179-4","5.10.179-5","5.10.191-1","5.10.197-1","5.10.205-1","5.10.205-2","5.10.209-1","5.10.209-2","5.10.216-1","5.10.218-1","5.10.221-1","5.10.223-1","5.10.226-1","5.10.234-1","5.10.237-1","5.10.46-4","5.10.46-5","5.10.70-1","5.10.70-1~bpo10+1","5.10.84-1","5.10.92-1","5.10.92-1~bpo10+1","5.10.92-2"],"bundled":331},{"source":"osv","ecosystem":"openEuler:22.03-LTS","package":"kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.0-60.130.0.157.oe2203"}]}],"bundled":5},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP1","package":"kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.0-136.68.0.148.oe2203sp1"}]}],"bundled":5},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP2","package":"kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.0-153.47.0.125.oe2203sp2"}]}],"bundled":5},{"source":"osv","ecosystem":"openEuler:22.03-LTS-SP3","package":"kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.0-192.0.0.105.oe2203sp3"}]}],"bundled":5},{"source":"osv","ecosystem":"Root:Debian:11","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.262-1.aikido.113"},{"fixed":"5.10.262-1.aikido.114"}]}]},{"source":"osv","ecosystem":"Root:Debian:11","package":"rootio-linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.10.262-1.aikido.113"},{"fixed":"5.10.262-1.aikido.114"}]}]},{"source":"osv","ecosystem":"SUSE:Linux 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["web"]},{"url":"https://www.suse.com/security/cve/CVE-2023-53118","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-26974","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-26982","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-44963","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-46713","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2024-49861","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-21731","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-21928","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-23163","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-37798","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-37856","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-37885","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-37920","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38034","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38035","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38040","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38051","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38058","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38064","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38068","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38074","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38079","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38094","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38105","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38108","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38112","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38115","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38126","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38147","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38157","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38161","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38166","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38177","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38180","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38181","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38192","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38193","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38198","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38200","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38211","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38212","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38213","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38222","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38249","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38250","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38264","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38312","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38319","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38323","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38337","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38350","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38375","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38391","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38403","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38415","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38420","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38468","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38477","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38494","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2025-38495","tags":["web"]},{"url":"https://ubuntu.com/security/CVE-2021-46987","tags":["report"]},{"url":"https://git.kernel.org/linus/f9baa501b4fd6962257853d46ddffbc21f27e344","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-46987","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-46987","title":"btrfs: fix deadlock when cloning inline extents and using qgroups","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock when cloning inline extents and using qgroups\n\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\n\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination's inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\").\n\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode's iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\n\nWhen this issue happens, stack traces like the following are reported:\n\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\n\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\n\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---","status":"published","published":"2024-02-28T08:13:14.69Z","modified":"2026-05-23T15:18:53.69Z","updated_at":"2026-11-02T14:33:03.320536Z"}],"euvd":[{"id":"EUVD-2021-33635","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock when cloning inline extents and using qgroups\n\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\n\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination's inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\").\n\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode's iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\n\nWhen this issue happens, stack traces like the following are reported:\n\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\n\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\n\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---","status":"published","published":"2024-02-28T08:13:14Z","modified":"2026-05-23T15:18:53Z","updated_at":"2026-11-02T18:21:12.112235Z"}],"ghsa":[{"id":"GHSA-85xw-cv8g-9227","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock when...","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock when cloning inline extents and using qgroups\n\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\n\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination's inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\").\n\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode's iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\n\nWhen this issue happens, stack traces like the following are reported:\n\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\n\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\n\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---","status":"published","published":"2024-02-28T09:30:37Z","modified":"2025-11-03T18:31:13Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T15:04:17.06099Z"}],"nvd":[{"id":"CVE-2021-46987","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock when cloning inline extents and using qgroups\n\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\n\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination's inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\").\n\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode's iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\n\nWhen this issue happens, stack traces like the following are reported:\n\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\n\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\n\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---","status":"published","published":"2024-02-28T09:15:37.583Z","modified":"2026-06-17T04:16:05.287Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium","assessor":"primary"}],"cwes":["CWE-667"],"updated_at":"2026-11-02T14:07:08.163458Z"}],"osv":[{"id":"CVE-2021-46987","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: fix deadlock when cloning inline extents and using qgroups\n\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\n\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination's inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\").\n\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode's iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\n\nWhen this issue happens, stack traces like the following are reported:\n\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\n\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\n\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---","status":"published","published":"2024-02-28T09:15:37.583Z","modified":"2026-03-14T11:18:52.893208Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:44:22.18434Z"},{"id":"DEBIAN-CVE-2021-46987","description":"In the Linux kernel, the following vulnerability has been resolved:  btrfs: fix deadlock when cloning inline extents and using qgroups  There are a few exceptional cases where cloning an inline extent needs to copy the inline extent data into a page of the destination inode.  When this happens, we end up starting a transaction while having a dirty page for the destination inode and while having the range locked in the destination's inode iotree too. Because when reserving metadata space for a transaction we may need to flush existing delalloc in case there is not enough free space, we have a mechanism in place to prevent a deadlock, which was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when cloning inline extent and low on free metadata space\").  However when using qgroups, a transaction also reserves metadata qgroup space, which can also result in flushing delalloc in case there is not enough available space at the moment. When this happens we deadlock, since flushing delalloc requires locking the file range in the inode's iotree and the range was already locked at the very beginning of the clone operation, before attempting to start the transaction.  When this issue happens, stack traces like the following are reported:    [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000   [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)   [72747.556271] Call Trace:   [72747.556273]  __schedule+0x296/0x760   [72747.556277]  schedule+0x3c/0xa0   [72747.556279]  io_schedule+0x12/0x40   [72747.556284]  __lock_page+0x13c/0x280   [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70   [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]   [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160   [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]   [72747.556362]  ? update_group_capacity+0x25/0x210   [72747.556366]  ? cpumask_next_and+0x1a/0x20   [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]   [72747.556394]  do_writepages+0x41/0xd0   [72747.556398]  __writeback_single_inode+0x39/0x2a0   [72747.556403]  writeback_sb_inodes+0x1ea/0x440   [72747.556407]  __writeback_inodes_wb+0x5f/0xc0   [72747.556410]  wb_writeback+0x235/0x2b0   [72747.556414]  ? get_nr_inodes+0x35/0x50   [72747.556417]  wb_workfn+0x354/0x490   [72747.556420]  ? newidle_balance+0x2c5/0x3e0   [72747.556424]  process_one_work+0x1aa/0x340   [72747.556426]  worker_thread+0x30/0x390   [72747.556429]  ? create_worker+0x1a0/0x1a0   [72747.556432]  kthread+0x116/0x130   [72747.556435]  ? kthread_park+0x80/0x80   [72747.556438]  ret_from_fork+0x1f/0x30    [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]   [72747.566961] Call Trace:   [72747.566964]  __schedule+0x296/0x760   [72747.566968]  ? finish_wait+0x80/0x80   [72747.566970]  schedule+0x3c/0xa0   [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]   [72747.566999]  ? finish_wait+0x80/0x80   [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]   [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]   [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380   [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]   [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]   [72747.567106]  ? update_load_avg+0x7e/0x5f0   [72747.567109]  ? enqueue_entity+0xf4/0x6f0   [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]   [72747.567137]  ? enqueue_task_fair+0x93/0x6f0   [72747.567140]  do_writepages+0x41/0xd0   [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100   [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]   [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]   [72747.567200]  process_one_work+0x1aa/0x340   [72747.567202]  worker_thread+0x30/0x390   [72747.567205]  ? create_worker+0x1a0/0x1a0   [72747.567208]  kthread+0x116/0x130   [72747.567211]  ? kthread_park+0x80/0x80   [72747.567214]  ret_from_fork+0x1f/0x30    [72747.569686] task:fsstress        state:D stack:     ---truncated---","status":"published","published":"2024-02-28T09:15:37.583Z","modified":"2026-10-23T18:05:06.786521966Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:45:36.081807Z"},{"id":"OESA-2024-1298","title":"kernel security update","description":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbtrfs: fix deadlock when cloning inline extents and using qgroups\r\n\r\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\r\n\r\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination\u0026apos;s inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\u0026quot;btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\u0026quot;).\r\n\r\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode\u0026apos;s iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\r\n\r\nWhen this issue happens, stack traces like the following are reported:\r\n\r\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---(CVE-2021-46987)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Defer the free of inner map when necessary\r\n\r\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops-\u0026gt;map_free() in a kworker. But for now, most .map_free() callbacks\ndon\u0026apos;t use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops-\u0026gt;map_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\r\n\r\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map.(CVE-2023-52447)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\ngfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump\r\n\r\nSyzkaller has reported a NULL pointer dereference when accessing\nrgd-\u0026gt;rd_rgl in gfs2_rgrp_dump().  This can happen when creating\nrgd-\u0026gt;rd_gl fails in read_rindex_entry().  Add a NULL pointer check in\ngfs2_rgrp_dump() to prevent that.(CVE-2023-52448)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nmtd: Fix gluebi NULL pointer dereference caused by ftl notifier\r\n\r\nIf both ftl.ko and gluebi.ko are loaded, the notifier of ftl\ntriggers NULL pointer dereference when trying to access\n‘gluebi-\u0026gt;desc’ in gluebi_read().\r\n\r\nubi_gluebi_init\n  ubi_register_volume_notifier\n    ubi_enumerate_volumes\n      ubi_notify_all\n        gluebi_notify    nb-\u0026gt;notifier_call()\n          gluebi_create\n            mtd_device_register\n              mtd_device_parse_register\n                add_mtd_device\n                  blktrans_notify_add   not-\u0026gt;add()\n                    ftl_add_mtd         tr-\u0026gt;add_mtd()\n                      scan_header\n                        mtd_read\n                          mtd_read_oob\n                            mtd_read_oob_std\n                              gluebi_read   mtd-\u0026gt;read()\n                                gluebi-\u0026gt;desc - NULL\r\n\r\nDetailed reproduction information available at the Link [1],\r\n\r\nIn the normal case, obtain gluebi-\u0026gt;desc in the gluebi_get_device(),\nand access gluebi-\u0026gt;desc in the gluebi_read(). However,\ngluebi_get_device() is not executed in advance in the\nftl_add_mtd() process, which leads to NULL pointer dereference.\r\n\r\nThe solution for the gluebi module is to run jffs2 on the UBI\nvolume without considering working with ftl or mtdblock [2].\nTherefore, this problem can be avoided by preventing gluebi from\ncreating the mtdblock device after creating mtd partition of the\ntype MTD_UBIVOLUME.(CVE-2023-52449)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Fix accesses to uninit stack slots\r\n\r\nPrivileged programs are supposed to be able to read uninitialized stack\nmemory (ever since 6715df8d5) but, before this patch, these accesses\nwere permitted inconsistently. In particular, accesses were permitted\nabove state-\u0026gt;allocated_stack, but not below it. In other words, if the\nstack was already \u0026quot;large enough\u0026quot;, the access was permitted, but\notherwise the access was rejected instead of being allowed to \u0026quot;grow the\nstack\u0026quot;. This undesired rejection was happening in two places:\n- in check_stack_slot_within_bounds()\n- in check_stack_range_initialized()\nThis patch arranges for these accesses to be permitted. A bunch of tests\nthat were relying on the old rejection had to change; all of them were\nchanged to add also run unprivileged, in which case the old behavior\npersists. One tests couldn\u0026apos;t be updated - global_func16 - because it\ncan\u0026apos;t run unprivileged for other reasons.\r\n\r\nThis patch also fixes the tracking of the stack size for variable-offset\nreads. This second fix is bundled in the same commit as the first one\nbecause they\u0026apos;re inter-related. Before this patch, writes to the stack\nusing registers containing a variable offset (as opposed to registers\nwith fixed, known values) were not properly contributing to the\nfunction\u0026apos;s needed stack size. As a result, it was possible for a program\nto verify, but then to attempt to read out-of-bounds data at runtime\nbecause a too small stack had been allocated for it.\r\n\r\nEach function tracks the size of the stack it needs in\nbpf_subprog_info.stack_depth, which is maintained by\nupdate_stack_depth(). For regular memory accesses, check_mem_access()\nwas calling update_state_depth() but it was passing in only the fixed\npart of the offset register, ignoring the variable offset. This was\nincorrect; the minimum possible value of that register should be used\ninstead.\r\n\r\nThis tracking is now fixed by centralizing the tracking of stack size in\ngrow_stack_state(), and by lifting the calls to grow_stack_state() to\ncheck_stack_access_within_bounds() as suggested by Andrii. The code is\nnow simpler and more convincingly tracks the correct maximum stack size.\ncheck_stack_range_initialized() can now rely on enough stack having been\nallocated for the access; this helps with the fix for the first issue.\r\n\r\nA few tests were changed to also check the stack depth computation. The\none that fails without this patch is verifier_var_off:stack_write_priv_vs_unpriv.(CVE-2023-52452)","status":"published","published":"2024-03-22T11:06:44Z","modified":"2026-08-18T01:18:19.041555397Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"low"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"OESA-2024-1299","title":"kernel security update","description":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbtrfs: fix deadlock when cloning inline extents and using qgroups\r\n\r\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\r\n\r\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination\u0026apos;s inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\u0026quot;btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\u0026quot;).\r\n\r\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode\u0026apos;s iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\r\n\r\nWhen this issue happens, stack traces like the following are reported:\r\n\r\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---(CVE-2021-46987)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Defer the free of inner map when necessary\r\n\r\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops-\u0026gt;map_free() in a kworker. But for now, most .map_free() callbacks\ndon\u0026apos;t use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops-\u0026gt;map_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\r\n\r\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map.(CVE-2023-52447)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\ngfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump\r\n\r\nSyzkaller has reported a NULL pointer dereference when accessing\nrgd-\u0026gt;rd_rgl in gfs2_rgrp_dump().  This can happen when creating\nrgd-\u0026gt;rd_gl fails in read_rindex_entry().  Add a NULL pointer check in\ngfs2_rgrp_dump() to prevent that.(CVE-2023-52448)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nmtd: Fix gluebi NULL pointer dereference caused by ftl notifier\r\n\r\nIf both ftl.ko and gluebi.ko are loaded, the notifier of ftl\ntriggers NULL pointer dereference when trying to access\n‘gluebi-\u0026gt;desc’ in gluebi_read().\r\n\r\nubi_gluebi_init\n  ubi_register_volume_notifier\n    ubi_enumerate_volumes\n      ubi_notify_all\n        gluebi_notify    nb-\u0026gt;notifier_call()\n          gluebi_create\n            mtd_device_register\n              mtd_device_parse_register\n                add_mtd_device\n                  blktrans_notify_add   not-\u0026gt;add()\n                    ftl_add_mtd         tr-\u0026gt;add_mtd()\n                      scan_header\n                        mtd_read\n                          mtd_read_oob\n                            mtd_read_oob_std\n                              gluebi_read   mtd-\u0026gt;read()\n                                gluebi-\u0026gt;desc - NULL\r\n\r\nDetailed reproduction information available at the Link [1],\r\n\r\nIn the normal case, obtain gluebi-\u0026gt;desc in the gluebi_get_device(),\nand access gluebi-\u0026gt;desc in the gluebi_read(). However,\ngluebi_get_device() is not executed in advance in the\nftl_add_mtd() process, which leads to NULL pointer dereference.\r\n\r\nThe solution for the gluebi module is to run jffs2 on the UBI\nvolume without considering working with ftl or mtdblock [2].\nTherefore, this problem can be avoided by preventing gluebi from\ncreating the mtdblock device after creating mtd partition of the\ntype MTD_UBIVOLUME.(CVE-2023-52449)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Fix accesses to uninit stack slots\r\n\r\nPrivileged programs are supposed to be able to read uninitialized stack\nmemory (ever since 6715df8d5) but, before this patch, these accesses\nwere permitted inconsistently. In particular, accesses were permitted\nabove state-\u0026gt;allocated_stack, but not below it. In other words, if the\nstack was already \u0026quot;large enough\u0026quot;, the access was permitted, but\notherwise the access was rejected instead of being allowed to \u0026quot;grow the\nstack\u0026quot;. This undesired rejection was happening in two places:\n- in check_stack_slot_within_bounds()\n- in check_stack_range_initialized()\nThis patch arranges for these accesses to be permitted. A bunch of tests\nthat were relying on the old rejection had to change; all of them were\nchanged to add also run unprivileged, in which case the old behavior\npersists. One tests couldn\u0026apos;t be updated - global_func16 - because it\ncan\u0026apos;t run unprivileged for other reasons.\r\n\r\nThis patch also fixes the tracking of the stack size for variable-offset\nreads. This second fix is bundled in the same commit as the first one\nbecause they\u0026apos;re inter-related. Before this patch, writes to the stack\nusing registers containing a variable offset (as opposed to registers\nwith fixed, known values) were not properly contributing to the\nfunction\u0026apos;s needed stack size. As a result, it was possible for a program\nto verify, but then to attempt to read out-of-bounds data at runtime\nbecause a too small stack had been allocated for it.\r\n\r\nEach function tracks the size of the stack it needs in\nbpf_subprog_info.stack_depth, which is maintained by\nupdate_stack_depth(). For regular memory accesses, check_mem_access()\nwas calling update_state_depth() but it was passing in only the fixed\npart of the offset register, ignoring the variable offset. This was\nincorrect; the minimum possible value of that register should be used\ninstead.\r\n\r\nThis tracking is now fixed by centralizing the tracking of stack size in\ngrow_stack_state(), and by lifting the calls to grow_stack_state() to\ncheck_stack_access_within_bounds() as suggested by Andrii. The code is\nnow simpler and more convincingly tracks the correct maximum stack size.\ncheck_stack_range_initialized() can now rely on enough stack having been\nallocated for the access; this helps with the fix for the first issue.\r\n\r\nA few tests were changed to also check the stack depth computation. The\none that fails without this patch is verifier_var_off:stack_write_priv_vs_unpriv.(CVE-2023-52452)","status":"published","published":"2024-03-22T11:06:44Z","modified":"2026-08-18T01:17:12.760985587Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"low"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"OESA-2024-1300","title":"kernel security update","description":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbtrfs: fix deadlock when cloning inline extents and using qgroups\r\n\r\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\r\n\r\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination\u0026apos;s inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\u0026quot;btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\u0026quot;).\r\n\r\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode\u0026apos;s iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\r\n\r\nWhen this issue happens, stack traces like the following are reported:\r\n\r\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---(CVE-2021-46987)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Defer the free of inner map when necessary\r\n\r\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops-\u0026gt;map_free() in a kworker. But for now, most .map_free() callbacks\ndon\u0026apos;t use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops-\u0026gt;map_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\r\n\r\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map.(CVE-2023-52447)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\ngfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump\r\n\r\nSyzkaller has reported a NULL pointer dereference when accessing\nrgd-\u0026gt;rd_rgl in gfs2_rgrp_dump().  This can happen when creating\nrgd-\u0026gt;rd_gl fails in read_rindex_entry().  Add a NULL pointer check in\ngfs2_rgrp_dump() to prevent that.(CVE-2023-52448)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nmtd: Fix gluebi NULL pointer dereference caused by ftl notifier\r\n\r\nIf both ftl.ko and gluebi.ko are loaded, the notifier of ftl\ntriggers NULL pointer dereference when trying to access\n‘gluebi-\u0026gt;desc’ in gluebi_read().\r\n\r\nubi_gluebi_init\n  ubi_register_volume_notifier\n    ubi_enumerate_volumes\n      ubi_notify_all\n        gluebi_notify    nb-\u0026gt;notifier_call()\n          gluebi_create\n            mtd_device_register\n              mtd_device_parse_register\n                add_mtd_device\n                  blktrans_notify_add   not-\u0026gt;add()\n                    ftl_add_mtd         tr-\u0026gt;add_mtd()\n                      scan_header\n                        mtd_read\n                          mtd_read_oob\n                            mtd_read_oob_std\n                              gluebi_read   mtd-\u0026gt;read()\n                                gluebi-\u0026gt;desc - NULL\r\n\r\nDetailed reproduction information available at the Link [1],\r\n\r\nIn the normal case, obtain gluebi-\u0026gt;desc in the gluebi_get_device(),\nand access gluebi-\u0026gt;desc in the gluebi_read(). However,\ngluebi_get_device() is not executed in advance in the\nftl_add_mtd() process, which leads to NULL pointer dereference.\r\n\r\nThe solution for the gluebi module is to run jffs2 on the UBI\nvolume without considering working with ftl or mtdblock [2].\nTherefore, this problem can be avoided by preventing gluebi from\ncreating the mtdblock device after creating mtd partition of the\ntype MTD_UBIVOLUME.(CVE-2023-52449)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Fix accesses to uninit stack slots\r\n\r\nPrivileged programs are supposed to be able to read uninitialized stack\nmemory (ever since 6715df8d5) but, before this patch, these accesses\nwere permitted inconsistently. In particular, accesses were permitted\nabove state-\u0026gt;allocated_stack, but not below it. In other words, if the\nstack was already \u0026quot;large enough\u0026quot;, the access was permitted, but\notherwise the access was rejected instead of being allowed to \u0026quot;grow the\nstack\u0026quot;. This undesired rejection was happening in two places:\n- in check_stack_slot_within_bounds()\n- in check_stack_range_initialized()\nThis patch arranges for these accesses to be permitted. A bunch of tests\nthat were relying on the old rejection had to change; all of them were\nchanged to add also run unprivileged, in which case the old behavior\npersists. One tests couldn\u0026apos;t be updated - global_func16 - because it\ncan\u0026apos;t run unprivileged for other reasons.\r\n\r\nThis patch also fixes the tracking of the stack size for variable-offset\nreads. This second fix is bundled in the same commit as the first one\nbecause they\u0026apos;re inter-related. Before this patch, writes to the stack\nusing registers containing a variable offset (as opposed to registers\nwith fixed, known values) were not properly contributing to the\nfunction\u0026apos;s needed stack size. As a result, it was possible for a program\nto verify, but then to attempt to read out-of-bounds data at runtime\nbecause a too small stack had been allocated for it.\r\n\r\nEach function tracks the size of the stack it needs in\nbpf_subprog_info.stack_depth, which is maintained by\nupdate_stack_depth(). For regular memory accesses, check_mem_access()\nwas calling update_state_depth() but it was passing in only the fixed\npart of the offset register, ignoring the variable offset. This was\nincorrect; the minimum possible value of that register should be used\ninstead.\r\n\r\nThis tracking is now fixed by centralizing the tracking of stack size in\ngrow_stack_state(), and by lifting the calls to grow_stack_state() to\ncheck_stack_access_within_bounds() as suggested by Andrii. The code is\nnow simpler and more convincingly tracks the correct maximum stack size.\ncheck_stack_range_initialized() can now rely on enough stack having been\nallocated for the access; this helps with the fix for the first issue.\r\n\r\nA few tests were changed to also check the stack depth computation. The\none that fails without this patch is verifier_var_off:stack_write_priv_vs_unpriv.(CVE-2023-52452)","status":"published","published":"2024-03-22T11:06:44Z","modified":"2026-08-18T01:17:12.721290966Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"low"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"OESA-2024-1301","title":"kernel security update","description":"The Linux Kernel, the operating system core itself.\r\n\r\nSecurity Fix(es):\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbtrfs: fix deadlock when cloning inline extents and using qgroups\r\n\r\nThere are a few exceptional cases where cloning an inline extent needs to\ncopy the inline extent data into a page of the destination inode.\r\n\r\nWhen this happens, we end up starting a transaction while having a dirty\npage for the destination inode and while having the range locked in the\ndestination\u0026apos;s inode iotree too. Because when reserving metadata space\nfor a transaction we may need to flush existing delalloc in case there is\nnot enough free space, we have a mechanism in place to prevent a deadlock,\nwhich was introduced in commit 3d45f221ce627d (\u0026quot;btrfs: fix deadlock when\ncloning inline extent and low on free metadata space\u0026quot;).\r\n\r\nHowever when using qgroups, a transaction also reserves metadata qgroup\nspace, which can also result in flushing delalloc in case there is not\nenough available space at the moment. When this happens we deadlock, since\nflushing delalloc requires locking the file range in the inode\u0026apos;s iotree\nand the range was already locked at the very beginning of the clone\noperation, before attempting to start the transaction.\r\n\r\nWhen this issue happens, stack traces like the following are reported:\r\n\r\n  [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:     2 flags:0x00004000\n  [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)\n  [72747.556271] Call Trace:\n  [72747.556273]  __schedule+0x296/0x760\n  [72747.556277]  schedule+0x3c/0xa0\n  [72747.556279]  io_schedule+0x12/0x40\n  [72747.556284]  __lock_page+0x13c/0x280\n  [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70\n  [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]\n  [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160\n  [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]\n  [72747.556362]  ? update_group_capacity+0x25/0x210\n  [72747.556366]  ? cpumask_next_and+0x1a/0x20\n  [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.556394]  do_writepages+0x41/0xd0\n  [72747.556398]  __writeback_single_inode+0x39/0x2a0\n  [72747.556403]  writeback_sb_inodes+0x1ea/0x440\n  [72747.556407]  __writeback_inodes_wb+0x5f/0xc0\n  [72747.556410]  wb_writeback+0x235/0x2b0\n  [72747.556414]  ? get_nr_inodes+0x35/0x50\n  [72747.556417]  wb_workfn+0x354/0x490\n  [72747.556420]  ? newidle_balance+0x2c5/0x3e0\n  [72747.556424]  process_one_work+0x1aa/0x340\n  [72747.556426]  worker_thread+0x30/0x390\n  [72747.556429]  ? create_worker+0x1a0/0x1a0\n  [72747.556432]  kthread+0x116/0x130\n  [72747.556435]  ? kthread_park+0x80/0x80\n  [72747.556438]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]\n  [72747.566961] Call Trace:\n  [72747.566964]  __schedule+0x296/0x760\n  [72747.566968]  ? finish_wait+0x80/0x80\n  [72747.566970]  schedule+0x3c/0xa0\n  [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]\n  [72747.566999]  ? finish_wait+0x80/0x80\n  [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]\n  [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]\n  [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380\n  [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]\n  [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]\n  [72747.567106]  ? update_load_avg+0x7e/0x5f0\n  [72747.567109]  ? enqueue_entity+0xf4/0x6f0\n  [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]\n  [72747.567137]  ? enqueue_task_fair+0x93/0x6f0\n  [72747.567140]  do_writepages+0x41/0xd0\n  [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100\n  [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]\n  [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]\n  [72747.567200]  process_one_work+0x1aa/0x340\n  [72747.567202]  worker_thread+0x30/0x390\n  [72747.567205]  ? create_worker+0x1a0/0x1a0\n  [72747.567208]  kthread+0x116/0x130\n  [72747.567211]  ? kthread_park+0x80/0x80\n  [72747.567214]  ret_from_fork+0x1f/0x30\r\n\r\n  [72747.569686] task:fsstress        state:D stack:    \n---truncated---(CVE-2021-46987)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Defer the free of inner map when necessary\r\n\r\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops-\u0026gt;map_free() in a kworker. But for now, most .map_free() callbacks\ndon\u0026apos;t use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops-\u0026gt;map_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\r\n\r\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map.(CVE-2023-52447)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\ngfs2: Fix kernel NULL pointer dereference in gfs2_rgrp_dump\r\n\r\nSyzkaller has reported a NULL pointer dereference when accessing\nrgd-\u0026gt;rd_rgl in gfs2_rgrp_dump().  This can happen when creating\nrgd-\u0026gt;rd_gl fails in read_rindex_entry().  Add a NULL pointer check in\ngfs2_rgrp_dump() to prevent that.(CVE-2023-52448)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nmtd: Fix gluebi NULL pointer dereference caused by ftl notifier\r\n\r\nIf both ftl.ko and gluebi.ko are loaded, the notifier of ftl\ntriggers NULL pointer dereference when trying to access\n‘gluebi-\u0026gt;desc’ in gluebi_read().\r\n\r\nubi_gluebi_init\n  ubi_register_volume_notifier\n    ubi_enumerate_volumes\n      ubi_notify_all\n        gluebi_notify    nb-\u0026gt;notifier_call()\n          gluebi_create\n            mtd_device_register\n              mtd_device_parse_register\n                add_mtd_device\n                  blktrans_notify_add   not-\u0026gt;add()\n                    ftl_add_mtd         tr-\u0026gt;add_mtd()\n                      scan_header\n                        mtd_read\n                          mtd_read_oob\n                            mtd_read_oob_std\n                              gluebi_read   mtd-\u0026gt;read()\n                                gluebi-\u0026gt;desc - NULL\r\n\r\nDetailed reproduction information available at the Link [1],\r\n\r\nIn the normal case, obtain gluebi-\u0026gt;desc in the gluebi_get_device(),\nand access gluebi-\u0026gt;desc in the gluebi_read(). However,\ngluebi_get_device() is not executed in advance in the\nftl_add_mtd() process, which leads to NULL pointer dereference.\r\n\r\nThe solution for the gluebi module is to run jffs2 on the UBI\nvolume without considering working with ftl or mtdblock [2].\nTherefore, this problem can be avoided by preventing gluebi from\ncreating the mtdblock device after creating mtd partition of the\ntype MTD_UBIVOLUME.(CVE-2023-52449)\r\n\r\nIn the Linux kernel, the following vulnerability has been resolved:\r\n\r\nbpf: Fix accesses to uninit stack slots\r\n\r\nPrivileged programs are supposed to be able to read uninitialized stack\nmemory (ever since 6715df8d5) but, before this patch, these accesses\nwere permitted inconsistently. In particular, accesses were permitted\nabove state-\u0026gt;allocated_stack, but not below it. In other words, if the\nstack was already \u0026quot;large enough\u0026quot;, the access was permitted, but\notherwise the access was rejected instead of being allowed to \u0026quot;grow the\nstack\u0026quot;. This undesired rejection was happening in two places:\n- in check_stack_slot_within_bounds()\n- in check_stack_range_initialized()\nThis patch arranges for these accesses to be permitted. A bunch of tests\nthat were relying on the old rejection had to change; all of them were\nchanged to add also run unprivileged, in which case the old behavior\npersists. One tests couldn\u0026apos;t be updated - global_func16 - because it\ncan\u0026apos;t run unprivileged for other reasons.\r\n\r\nThis patch also fixes the tracking of the stack size for variable-offset\nreads. This second fix is bundled in the same commit as the first one\nbecause they\u0026apos;re inter-related. Before this patch, writes to the stack\nusing registers containing a variable offset (as opposed to registers\nwith fixed, known values) were not properly contributing to the\nfunction\u0026apos;s needed stack size. As a result, it was possible for a program\nto verify, but then to attempt to read out-of-bounds data at runtime\nbecause a too small stack had been allocated for it.\r\n\r\nEach function tracks the size of the stack it needs in\nbpf_subprog_info.stack_depth, which is maintained by\nupdate_stack_depth(). For regular memory accesses, check_mem_access()\nwas calling update_state_depth() but it was passing in only the fixed\npart of the offset register, ignoring the variable offset. This was\nincorrect; the minimum possible value of that register should be used\ninstead.\r\n\r\nThis tracking is now fixed by centralizing the tracking of stack size in\ngrow_stack_state(), and by lifting the calls to grow_stack_state() to\ncheck_stack_access_within_bounds() as suggested by Andrii. The code is\nnow simpler and more convincingly tracks the correct maximum stack size.\ncheck_stack_range_initialized() can now rely on enough stack having been\nallocated for the access; this helps with the fix for the first issue.\r\n\r\nA few tests were changed to also check the stack depth computation. The\none that fails without this patch is verifier_var_off:stack_write_priv_vs_unpriv.(CVE-2023-52452)","status":"published","published":"2024-03-22T11:06:44Z","modified":"2026-08-18T01:18:19.858132151Z","cvss":[{"version":"3.1","score":3.9,"vector":"CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:L/I:L/A:L","level":"low"}],"updated_at":"2026-11-02T15:52:40.71472Z"},{"id":"ROOT-OS-DEBIAN-11-CVE-2021-46987","title":"CVE-2021-46987 in linux - Patched by Root","description":"Root has patched CVE-2021-46987 in the linux package for Root:Debian:11. Multiple fixed versions available.","status":"published","published":"2026-08-23T09:13:41Z","modified":"2026-08-23T10:17:48.892350506Z","cvss":[{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:28.544053Z"},{"id":"UBUNTU-CVE-2021-46987","description":"In the Linux kernel, the following vulnerability has been resolved: btrfs: fix deadlock when cloning inline extents and using qgroups There are a few exceptional cases where cloning an inline extent needs to copy the inline extent data into a page of the destination inode. When this happens, we end up starting a transaction while having a dirty page for the destination inode and while having the range locked in the destination's inode iotree too. Because when reserving metadata space for a transaction we may need to flush existing delalloc in case there is not enough free space, we have a mechanism in place to prevent a deadlock, which was introduced in commit 3d45f221ce627d (\"btrfs: fix deadlock when cloning inline extent and low on free metadata space\"). However when using qgroups, a transaction also reserves metadata qgroup space, which can also result in flushing delalloc in case there is not enough available space at the moment. When this happens we deadlock, since flushing delalloc requires locking the file range in the inode's iotree and the range was already locked at the very beginning of the clone operation, before attempting to start the transaction. When this issue happens, stack traces like the following are reported:   [72747.556262] task:kworker/u81:9   state:D stack:    0 pid:  225 ppid:   2 flags:0x00004000   [72747.556268] Workqueue: writeback wb_workfn (flush-btrfs-1142)   [72747.556271] Call Trace:   [72747.556273]  __schedule+0x296/0x760   [72747.556277]  schedule+0x3c/0xa0   [72747.556279]  io_schedule+0x12/0x40   [72747.556284]  __lock_page+0x13c/0x280   [72747.556287]  ? generic_file_readonly_mmap+0x70/0x70   [72747.556325]  extent_write_cache_pages+0x22a/0x440 [btrfs]   [72747.556331]  ? __set_page_dirty_nobuffers+0xe7/0x160   [72747.556358]  ? set_extent_buffer_dirty+0x5e/0x80 [btrfs]   [72747.556362]  ? update_group_capacity+0x25/0x210   [72747.556366]  ? cpumask_next_and+0x1a/0x20   [72747.556391]  extent_writepages+0x44/0xa0 [btrfs]   [72747.556394]  do_writepages+0x41/0xd0   [72747.556398]  __writeback_single_inode+0x39/0x2a0   [72747.556403]  writeback_sb_inodes+0x1ea/0x440   [72747.556407]  __writeback_inodes_wb+0x5f/0xc0   [72747.556410]  wb_writeback+0x235/0x2b0   [72747.556414]  ? get_nr_inodes+0x35/0x50   [72747.556417]  wb_workfn+0x354/0x490   [72747.556420]  ? newidle_balance+0x2c5/0x3e0   [72747.556424]  process_one_work+0x1aa/0x340   [72747.556426]  worker_thread+0x30/0x390   [72747.556429]  ? create_worker+0x1a0/0x1a0   [72747.556432]  kthread+0x116/0x130   [72747.556435]  ? kthread_park+0x80/0x80   [72747.556438]  ret_from_fork+0x1f/0x30   [72747.566958] Workqueue: btrfs-flush_delalloc btrfs_work_helper [btrfs]   [72747.566961] Call Trace:   [72747.566964]  __schedule+0x296/0x760   [72747.566968]  ? finish_wait+0x80/0x80   [72747.566970]  schedule+0x3c/0xa0   [72747.566995]  wait_extent_bit.constprop.68+0x13b/0x1c0 [btrfs]   [72747.566999]  ? finish_wait+0x80/0x80   [72747.567024]  lock_extent_bits+0x37/0x90 [btrfs]   [72747.567047]  btrfs_invalidatepage+0x299/0x2c0 [btrfs]   [72747.567051]  ? find_get_pages_range_tag+0x2cd/0x380   [72747.567076]  __extent_writepage+0x203/0x320 [btrfs]   [72747.567102]  extent_write_cache_pages+0x2bb/0x440 [btrfs]   [72747.567106]  ? update_load_avg+0x7e/0x5f0   [72747.567109]  ? enqueue_entity+0xf4/0x6f0   [72747.567134]  extent_writepages+0x44/0xa0 [btrfs]   [72747.567137]  ? enqueue_task_fair+0x93/0x6f0   [72747.567140]  do_writepages+0x41/0xd0   [72747.567144]  __filemap_fdatawrite_range+0xc7/0x100   [72747.567167]  btrfs_run_delalloc_work+0x17/0x40 [btrfs]   [72747.567195]  btrfs_work_helper+0xc2/0x300 [btrfs]   [72747.567200]  process_one_work+0x1aa/0x340   [72747.567202]  worker_thread+0x30/0x390   [72747.567205]  ? create_worker+0x1a0/0x1a0   [72747.567208]  kthread+0x116/0x130   [72747.567211]  ? kthread_park+0x80/0x80   [72747.567214]  ret_from_fork+0x1f/0x30   [72747.569686] task:fsstress        state:D stack: ---truncated---","status":"published","published":"2024-02-28T09:15:00Z","modified":"2026-11-11T09:37:07.755341806Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","level":"medium"},{"version":"3.1","score":5.5,"vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-11T09:58:38.809003Z"},{"id":"DLA-4327-1","title":"linux - security update","status":"published","published":"2025-10-13T00:00:00Z","modified":"2026-03-09T02:11:02.149849Z","updated_at":"2026-11-02T15:46:12.7027Z"},{"id":"SUSE-SU-2025:02846-1","title":"Security update for the Linux Kernel","description":"\nThe SUSE Linux Enterprise 12 SP5 kernel was updated to receive various security bugfixes.\n\n\nThe following security bugs were fixed:\n\n- CVE-2021-46984: Fixed an out of bounds access in kyber_bio_merge() in kyber (bsc#1220631).\n- CVE-2021-46987: btrfs: fix deadlock when cloning inline extents and using qgroups (bsc#1220704).\n- CVE-2022-4129: Fixed a denial of service with the Layer 2 Tunneling Protocol (L2TP). A missing lock when clearing sk_user_data can lead to a race condition and NULL pointer dereference (bsc#1205711).\n- CVE-2022-49138: Bluetooth: hci_event: Fix checking conn for le_conn_complete_evt (bsc#1238160).\n- CVE-2022-49319: iommu/arm-smmu-v3: check return value after calling platform_get_resource() (bsc#1238374).\n- CVE-2022-49323: iommu/arm-smmu: fix possible null-ptr-deref in arm_smmu_device_probe() (bsc#1238400).\n- CVE-2022-49768: 9p/fd: fix issue of list_del corruption in p9_fd_cancel() (bsc#1242446).\n- CVE-2022-49825: ata: libata-transport: fix error handling in ata_tport_add() (bsc#1242548).\n- CVE-2022-49934: wifi: mac80211: Fix UAF in ieee80211_scan_rx() (bsc#1245051).\n- CVE-2022-49948: vt: Clear selection before changing the font (bsc#1245058).\n- CVE-2022-49969: drm/amd/display: clear optc underflow before turn off odm clock (bsc#1245060).\n- CVE-2022-49993: loop: Check for overflow while configuring loop (bsc#1245121).\n- CVE-2022-50025: cxl: Fix a memory leak in an error handling path (bsc#1245132).\n- CVE-2022-50027: scsi: lpfc: Fix possible memory leak when failing to issue CMF WQE (bsc#1245073).\n- CVE-2022-50030: scsi: lpfc: Prevent buffer overflow crashes in debugfs with malformed user input (bsc#1245265).\n- CVE-2022-50033: usb: host: ohci-ppc-of: Fix refcount leak bug (bsc#1245139).\n- CVE-2022-50103: sched, cpuset: Fix dl_cpu_busy() panic due to empty cs-\u003ecpus_allowed (bsc#1244840).\n- CVE-2022-50149: driver core: fix potential deadlock in __driver_attach (bsc#1244883).\n- CVE-2022-50226: crypto: ccp - Use kzalloc for sev ioctl interfaces to prevent kernel memory leak (bsc#1244860).\n- CVE-2023-2176: Fixed an out-of-boundary read in compare_netdev_and_ip in drivers/infiniband/core/cma.c in RDMA (bsc#1210629).\n- CVE-2023-52878: can: dev: can_put_echo_skb(): do not crash kernel if can_priv::echo_skb is accessed out of bounds (bsc#1225000).\n- CVE-2023-53020: l2tp: close all race conditions in l2tp_tunnel_register() (bsc#1240224).\n- CVE-2023-53117: fs: prevent out-of-bounds array speculation when closing a file descriptor (bsc#1242780).\n- CVE-2023-53118: scsi: core: Fix a procfs host directory removal regression (bsc#1242365).\n- CVE-2024-26974: crypto: qat - resolve race condition during AER recovery (bsc#1223638).\n- CVE-2024-26982: Fixed Squashfs inode number check not to be an invalid value of zero (bsc#1223634).\n- CVE-2024-44963: btrfs: do not BUG_ON() when freeing tree block after error (bsc#1230216).\n- CVE-2024-46713: kabi fix for perf/aux: Fix AUX buffer serialization (bsc#1230581).\n- CVE-2024-49861: net: clear the dst when changing skb protocol (bsc#1245954).\n- CVE-2025-21731: nbd: do not allow reconnect after disconnect (bsc#1237881).\n- CVE-2025-21928: HID: intel-ish-hid: Fix use-after-free issue in ishtp_hid_remove() (bsc#1240722).\n- CVE-2025-23163: net: vlan: do not propagate flags on open (bsc#1242837).\n- CVE-2025-37856: btrfs: harden block_group::bg_list against list_del() races (bsc#1243068).\n- CVE-2025-37885: KVM: x86: Reset IRTE to host control if *new* route isn't postable (bsc#1242960).\n- CVE-2025-37920: kABI workaround for xsk: Fix race condition in AF_XDP generic RX path (bsc#1243479).\n- CVE-2025-38034: btrfs: correct the order of prelim_ref arguments in btrfs__prelim_ref (bsc#1244792).\n- CVE-2025-38035: nvmet-tcp: do not restore null sk_state_change (bsc#1244801).\n- CVE-2025-38040: serial: mctrl_gpio: split disable_ms into sync and no_sync APIs (bsc#1245078).\n- CVE-2025-38051: smb: client: Fix use-after-free in cifs_fill_dirent (bsc#1244750).\n- CVE-2025-38058: __legitimize_mnt(): check for MNT_SYNC_UMOUNT should be under mount_lock (bsc#1245151).\n- CVE-2025-38064: virtio: break and reset virtio devices on device_shutdown() (bsc#1245201).\n- CVE-2025-38068: crypto: lzo - Fix compression buffer overrun (bsc#1245210).\n- CVE-2025-38074: vhost-scsi: protect vq-\u003elog_used with vq-\u003emutex (bsc#1244735).\n- CVE-2025-38079: crypto: algif_hash - fix double free in hash_accept (bsc#1245217).\n- CVE-2025-38094: net: cadence: macb: Fix a possible deadlock in macb_halt_tx (bsc#1245649).\n- CVE-2025-38105: ALSA: usb-audio: Kill timer properly at removal (bsc#1245682).\n- CVE-2025-38108: net_sched: red: fix a race in __red_change() (bsc#1245675).\n- CVE-2025-38112: net: Fix TOCTOU issue in sk_is_readable() (bsc#1245668).\n- CVE-2025-38115: net_sched: sch_sfq: fix a potential crash on gso_skb handling (bsc#1245689).\n- CVE-2025-38126: net: stmmac: make sure that ptp_rate is not 0 before configuring timestamping (bsc#1245708).\n- CVE-2025-38147: calipso: unlock rcu before returning -EAFNOSUPPORT (bsc#1245768).\n- CVE-2025-38157: wifi: ath9k_htc: Abort software beacon handling if disabled (bsc#1245747).\n- CVE-2025-38161: RDMA/mlx5: Fix error flow upon firmware failure for RQ destruction (bsc#1245777).\n- CVE-2025-38166: bpf: fix ktls panic with sockmap (bsc#1245758).\n- CVE-2025-38180: net: atm: fix /proc/net/atm/lec handling (bsc#1245970).\n- CVE-2025-38181: calipso: Fix null-ptr-deref in calipso_req_{set,del}attr() (bsc#1246000).\n- CVE-2025-38193: net_sched: sch_sfq: reject invalid perturb period (bsc#1245945).\n- CVE-2025-38198: fbcon: Make sure modelist not set on unregistered console (bsc#1245952).\n- CVE-2025-38200: i40e: fix MMIO write access to an invalid page in i40e_clear_hw (bsc#1246045).\n- CVE-2025-38211: RDMA/iwcm: Fix use-after-free of work objects after cm_id destruction (bsc#1246008).\n- CVE-2025-38212: ipc: fix to protect IPCS lookups using RCU (bsc#1246029).\n- CVE-2025-38213: vgacon: Add check for vc_origin address range in vgacon_scroll() (bsc#1246037).\n- CVE-2025-38222: ext4: inline: fix len overflow in ext4_prepare_inline_data (bsc#1245976).\n- CVE-2025-38249: ALSA: usb-audio: Fix out-of-bounds read in snd_usb_get_audioformat_uac3() (bsc#1246171).\n- CVE-2025-38250: kABI workaround for bluetooth hci_dev changes (bsc#1246182).\n- CVE-2025-38264: llist: add interface to check if a node is on a list (bsc#1246387).\n- CVE-2025-38312: fbdev: core: fbcvt: avoid division by 0 in fb_cvt_hperiod() (bsc#1246386).\n- CVE-2025-38319: drm/amd/pp: Fix potential NULL pointer dereference in atomctrl_initialize_mc_reg_table (bsc#1246243).\n- CVE-2025-38323: net: atm: add lec_mutex (bsc#1246473).\n- CVE-2025-38337: jbd2: fix data-race and null-ptr-deref in jbd2_journal_dirty_metadata() (bsc#1246253).\n- CVE-2025-38350: net/sched: Always pass notifications when child class becomes empty (bsc#1246781).\n- CVE-2025-38375: virtio-net: ensure the received length does not exceed allocated size (bsc#1247177).\n- CVE-2025-38391: usb: typec: altmodes/displayport: do not index invalid pin_assignments (bsc#1247181).\n- CVE-2025-38403: vsock/vmci: Clear the vmci transport packet properly when initializing it (bsc#1247141).\n- CVE-2025-38415: Squashfs: check return result of sb_min_blocksize (bsc#1247147).\n- CVE-2025-38420: wifi: carl9170: do not ping device which has failed to load firmware (bsc#1247279).\n- CVE-2025-38468: net/sched: Return NULL when htb_lookup_leaf encounters an empty rbtree (bsc#1247437).\n- CVE-2025-38477: net/sched: sch_qfq: Avoid triggering might_sleep in atomic context in qfq_delete_class (bsc#1247314).\n- CVE-2025-38494: HID: core: do not bypass hid_hw_raw_request (bsc#1247349).\n- CVE-2025-38495: HID: core: ensure the allocated report buffer can contain the reserved report ID (bsc#1247348).\n\nThe following non-security bugs were fixed:\n\n- RDMA/core: Always release restrack object (git-fixes)\n- bdi: Fix up kabi for dev_name addition (bsc#1171844).\n- bdi: add a -\u003edev_name field to struct backing_dev_info (bsc#1171844).\n- l2tp: Do not sleep and disable BH under writer-side sk_callback_lock (git-fixes).\n- l2tp: fix a sock refcnt leak in l2tp_tunnel_register (git-fixes).\n- scsi: core: Fix a source code comment (git-fixes).\n- scsi: core: Fix unremoved procfs host directory regression (git-fixes).\n- scsi: drivers: base: Propagate errors through the transport component (bsc#1242548)\n- scsi: drivers: base: Support atomic version of attribute_container_device_trigger (bsc#1242548)\n- virtgpu: do not reset on shutdown (git-fixes).\n","status":"published","published":"2025-08-18T15:47:45Z","modified":"2026-02-04T03:59:07.214191Z","updated_at":"2026-11-02T15:53:57.111474Z"}]}}