{"id":"CVE-2026-23181","aliases":["BELL-CVE-2026-23181","DEBIAN-CVE-2026-23181","EUVD-2026-6110","GHSA-4fxm-jm89-7f7q","ROOT-OS-UBUNTU-2204-CVE-2026-23181","ROOT-OS-UBUNTU-2404-CVE-2026-23181","UBUNTU-CVE-2026-23181"],"status":"published","title":"btrfs: sync read disk super and set block size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: sync read disk super and set block size\n\nWhen the user performs a btrfs mount, the block device is not set\ncorrectly. The user sets the block size of the block device to 0x4000\nby executing the BLKBSZSET command.\nSince the block size change also changes the mapping-\u003eflags value, this\nfurther affects the result of the mapping_min_folio_order() calculation.\n\nLet's analyze the following two scenarios:\n\nScenario 1: Without executing the BLKBSZSET command, the block size is\n0x1000, and mapping_min_folio_order() returns 0;\n\nScenario 2: After executing the BLKBSZSET command, the block size is\n0x4000, and mapping_min_folio_order() returns 2.\n\ndo_read_cache_folio() allocates a folio before the BLKBSZSET command\nis executed. This results in the allocated folio having an order value\nof 0. Later, after BLKBSZSET is executed, the block size increases to\n0x4000, and the mapping_min_folio_order() calculation result becomes 2.\n\nThis leads to two undesirable consequences:\n\n1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c\nmapping_min_folio_order(mapping)) assertion.\n\n2. The syzbot report [1] shows a null pointer dereference in\ncreate_empty_buffers() due to a buffer head allocation failure.\n\nSynchronization should be established based on the inode between the\nBLKBSZSET command and read cache page to prevent inconsistencies in\nblock size or mapping flags before and after folio allocation.\n\n[1]\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694\nCall Trace:\n folio_create_buffers+0x109/0x150 fs/buffer.c:1802\n block_read_full_folio+0x14c/0x850 fs/buffer.c:2403\n filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496\n do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096\n do_read_cache_page mm/filemap.c:4162 [inline]\n read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195\n btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","epss":{"day":"2026-11-12","score":0.00185,"percentile":0.08227,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"published":"2026-02-14T16:27:12Z","modified":"2026-11-11T09:39:26Z","fixes":[{"ecosystem":"Alpaquita:stream","package":"linux-lts","fixed_in":["6.18.35-r1"],"sources":["osv"]},{"ecosystem":"Linux","package":"Kernel","fixed_in":["6.18.10"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"linux","fixed_in":["6.18.10-1"],"sources":["osv"]},{"ecosystem":"Root:Ubuntu:22.04","package":"linux","fixed_in":["5.15.0-203.213.aikido.119"],"sources":["osv"]},{"ecosystem":"Root:Ubuntu:22.04","package":"rootio-linux","fixed_in":["5.15.0-203.213.aikido.119"],"sources":["osv"]},{"ecosystem":"Root:Ubuntu:24.04","package":"linux","fixed_in":["6.8.0-149.149.aikido.91"],"sources":["osv"]},{"ecosystem":"Root:Ubuntu:24.04","package":"rootio-linux","fixed_in":["6.8.0-149.149.aikido.91"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpaquita:stream","package":"linux-lts","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.12.92-r1"},{"fixed":"6.18.35-r1"}]}]},{"source":"osv","ecosystem":"Linux","package":"Kernel","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"6.15.0"},{"fixed":"6.18.10"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.18.10-1"}]}],"versions":["6.12.100-1","6.12.101-1","6.12.105-1","6.12.107-1","6.12.111-1","6.12.38-1","6.12.41-1","6.12.43-1","6.12.43-1~bpo12+1","6.12.48-1","6.12.57-1","6.12.57-1~bpo12+1","6.12.63-1","6.12.63-1~bpo12+1","6.12.69-1","6.12.69-1~bpo12+1","6.12.73-1","6.12.73-1~bpo12+1","6.12.74-1","6.12.74-2","6.12.74-2~bpo12+1","6.12.85-1","6.12.85-1~bpo12+1","6.12.86-1","6.12.86-1~bpo12+1","6.12.88-1","6.12.88-1~bpo12+1","6.12.90-1","6.12.90-1~bpo12+1","6.12.90-2","6.12.90-2~bpo12+1","6.12.94-1","6.12.94-1~bpo12+1","6.12.95-1","6.12.95-1~bpo12+1","6.12.96-1","6.13.10-1~exp1","6.13.11-1~exp1","6.13.2-1~exp1","6.13.3-1~exp1","6.13.4-1~exp1","6.13.5-1~exp1","6.13.6-1~exp1","6.13.7-1~exp1","6.13.8-1~exp1","6.13.9-1~exp1","6.13~rc6-1~exp1","6.13~rc7-1~exp1","6.14.3-1~exp1","6.14.5-1~exp1","6.14.6-1~exp1","6.15-1~exp1","6.15.1-1~exp1","6.15.2-1~exp1","6.15.3-1~exp1","6.15.4-1~exp1","6.15.5-1~exp1","6.15.6-1~exp1","6.15~rc7-1~exp1","6.16-1~exp1","6.16.1-1~exp1","6.16.10-1","6.16.11-1","6.16.12-1","6.16.12-1~bpo13+1","6.16.12-2","6.16.3-1","6.16.3-1~bpo13+1","6.16.5-1","6.16.6-1","6.16.7-1","6.16.8-1","6.16.9-1","6.16~rc7-1~exp1","6.17.10-1","6.17.11-1","6.17.12-1","6.17.13-1","6.17.13-1~bpo13+1","6.17.2-1~exp1","6.17.5-1~exp1","6.17.6-1","6.17.7-1","6.17.7-2","6.17.8-1","6.17.8-1~bpo13+1","6.17.9-1","6.18.1-1~exp1","6.18.2-1~exp1","6.18.3-1","6.18.5-1","6.18.5-1~bpo13+1","6.18.8-1","6.18.9-1","6.18.9-1~bpo13+1","6.18~rc4-1~exp1","6.18~rc4-1~exp2","6.18~rc5-1~exp1","6.18~rc6-1~exp1","6.18~rc7-1~exp1"]},{"source":"osv","ecosystem":"Root:Ubuntu:22.04","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.0-203.213.aikido.119"}]}]},{"source":"osv","ecosystem":"Root:Ubuntu:22.04","package":"rootio-linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.15.0-203.213.aikido.119"}]}]},{"source":"osv","ecosystem":"Root:Ubuntu:24.04","package":"linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.0-149.149.aikido.91"}]}]},{"source":"osv","ecosystem":"Root:Ubuntu:24.04","package":"rootio-linux","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.8.0-149.149.aikido.91"}]}]},{"source":"osv","ecosystem":"Ubuntu:16.04:LTS","package":"linux-hwe-edge","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.8.0-28.30~16.04.1","4.8.0-30.32~16.04.1","4.8.0-32.34~16.04.1","4.8.0-34.36~16.04.1","4.10.0-14.16~16.04.1","4.10.0-19.21~16.04.1","4.10.0-20.22~16.04.1","4.10.0-21.23~16.04.1","4.10.0-22.24~16.04.1","4.10.0-24.28~16.04.1","4.10.0-26.30~16.04.1","4.11.0-13.19~16.04.1","4.11.0-14.20~16.04.1","4.13.0-16.19~16.04.3","4.13.0-17.20~16.04.1","4.13.0-19.22~16.04.1","4.13.0-21.24~16.04.1","4.13.0-25.29~16.04.2","4.15.0-13.14~16.04.1","4.15.0-15.16~16.04.1","4.15.0-20.21~16.04.1","4.15.0-22.24~16.04.1","4.15.0-23.25~16.04.1"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-aws-5.0","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.0.0-1021.24~18.04.1","5.0.0-1022.25~18.04.1","5.0.0-1023.26~18.04.1","5.0.0-1024.27~18.04.1","5.0.0-1025.28","5.0.0-1027.30"]},{"source":"osv","ecosystem":"Ubuntu:18.04:LTS","package":"linux-aws-5.3","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-1016.17~18.04.1","5.3.0-1017.18~18.04.1","5.3.0-1019.21~18.04.1","5.3.0-1023.25~18.04.1","5.3.0-1028.30~18.04.1","5.3.0-1030.32~18.04.1","5.3.0-1032.34~18.04.2","5.3.0-1033.35","5.3.0-1034.36","5.3.0-1035.37"]},{"source":"osv","ecosystem":"U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sync read disk super and set block size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: sync read disk super and set block size\n\nWhen the user performs a btrfs mount, the block device is not set\ncorrectly. The user sets the block size of the block device to 0x4000\nby executing the BLKBSZSET command.\nSince the block size change also changes the mapping-\u003eflags value, this\nfurther affects the result of the mapping_min_folio_order() calculation.\n\nLet's analyze the following two scenarios:\n\nScenario 1: Without executing the BLKBSZSET command, the block size is\n0x1000, and mapping_min_folio_order() returns 0;\n\nScenario 2: After executing the BLKBSZSET command, the block size is\n0x4000, and mapping_min_folio_order() returns 2.\n\ndo_read_cache_folio() allocates a folio before the BLKBSZSET command\nis executed. This results in the allocated folio having an order value\nof 0. Later, after BLKBSZSET is executed, the block size increases to\n0x4000, and the mapping_min_folio_order() calculation result becomes 2.\n\nThis leads to two undesirable consequences:\n\n1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c\nmapping_min_folio_order(mapping)) assertion.\n\n2. The syzbot report [1] shows a null pointer dereference in\ncreate_empty_buffers() due to a buffer head allocation failure.\n\nSynchronization should be established based on the inode between the\nBLKBSZSET command and read cache page to prevent inconsistencies in\nblock size or mapping flags before and after folio allocation.\n\n[1]\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694\nCall Trace:\n folio_create_buffers+0x109/0x150 fs/buffer.c:1802\n block_read_full_folio+0x14c/0x850 fs/buffer.c:2403\n filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496\n do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096\n do_read_cache_page mm/filemap.c:4162 [inline]\n read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195\n btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","status":"published","published":"2026-02-14T16:27:12.137Z","modified":"2026-05-11T22:01:53.361Z","updated_at":"2026-11-02T13:42:15.603999Z"}],"euvd":[{"id":"EUVD-2026-6110","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: sync read disk super and set block size\n\nWhen the user performs a btrfs mount, the block device is not set\ncorrectly. The user sets the block size of the block device to 0x4000\nby executing the BLKBSZSET command.\nSince the block size change also changes the mapping-\u003eflags value, this\nfurther affects the result of the mapping_min_folio_order() calculation.\n\nLet's analyze the following two scenarios:\n\nScenario 1: Without executing the BLKBSZSET command, the block size is\n0x1000, and mapping_min_folio_order() returns 0;\n\nScenario 2: After executing the BLKBSZSET command, the block size is\n0x4000, and mapping_min_folio_order() returns 2.\n\ndo_read_cache_folio() allocates a folio before the BLKBSZSET command\nis executed. This results in the allocated folio having an order value\nof 0. Later, after BLKBSZSET is executed, the block size increases to\n0x4000, and the mapping_min_folio_order() calculation result becomes 2.\n\nThis leads to two undesirable consequences:\n\n1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c\nmapping_min_folio_order(mapping)) assertion.\n\n2. The syzbot report [1] shows a null pointer dereference in\ncreate_empty_buffers() due to a buffer head allocation failure.\n\nSynchronization should be established based on the inode between the\nBLKBSZSET command and read cache page to prevent inconsistencies in\nblock size or mapping flags before and after folio allocation.\n\n[1]\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694\nCall Trace:\n folio_create_buffers+0x109/0x150 fs/buffer.c:1802\n block_read_full_folio+0x14c/0x850 fs/buffer.c:2403\n filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496\n do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096\n do_read_cache_page mm/filemap.c:4162 [inline]\n read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195\n btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","status":"published","published":"2026-02-14T16:27:12Z","modified":"2026-05-11T22:01:53Z","updated_at":"2026-11-02T19:04:44.984644Z"}],"ghsa":[{"id":"GHSA-4fxm-jm89-7f7q","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: sync read disk super...","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: sync read disk super and set block size\n\nWhen the user performs a btrfs mount, the block device is not set\ncorrectly. The user sets the block size of the block device to 0x4000\nby executing the BLKBSZSET command.\nSince the block size change also changes the mapping-\u003eflags value, this\nfurther affects the result of the mapping_min_folio_order() calculation.\n\nLet's analyze the following two scenarios:\n\nScenario 1: Without executing the BLKBSZSET command, the block size is\n0x1000, and mapping_min_folio_order() returns 0;\n\nScenario 2: After executing the BLKBSZSET command, the block size is\n0x4000, and mapping_min_folio_order() returns 2.\n\ndo_read_cache_folio() allocates a folio before the BLKBSZSET command\nis executed. This results in the allocated folio having an order value\nof 0. Later, after BLKBSZSET is executed, the block size increases to\n0x4000, and the mapping_min_folio_order() calculation result becomes 2.\n\nThis leads to two undesirable consequences:\n\n1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c\nmapping_min_folio_order(mapping)) assertion.\n\n2. The syzbot report [1] shows a null pointer dereference in\ncreate_empty_buffers() due to a buffer head allocation failure.\n\nSynchronization should be established based on the inode between the\nBLKBSZSET command and read cache page to prevent inconsistencies in\nblock size or mapping flags before and after folio allocation.\n\n[1]\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694\nCall Trace:\n folio_create_buffers+0x109/0x150 fs/buffer.c:1802\n block_read_full_folio+0x14c/0x850 fs/buffer.c:2403\n filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496\n do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096\n do_read_cache_page mm/filemap.c:4162 [inline]\n read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195\n btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","status":"published","published":"2026-02-14T18:30:15Z","modified":"2026-02-14T18:30:16Z","updated_at":"2026-11-02T15:06:13.022126Z"}],"nvd":[{"id":"CVE-2026-23181","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: sync read disk super and set block size\n\nWhen the user performs a btrfs mount, the block device is not set\ncorrectly. The user sets the block size of the block device to 0x4000\nby executing the BLKBSZSET command.\nSince the block size change also changes the mapping-\u003eflags value, this\nfurther affects the result of the mapping_min_folio_order() calculation.\n\nLet's analyze the following two scenarios:\n\nScenario 1: Without executing the BLKBSZSET command, the block size is\n0x1000, and mapping_min_folio_order() returns 0;\n\nScenario 2: After executing the BLKBSZSET command, the block size is\n0x4000, and mapping_min_folio_order() returns 2.\n\ndo_read_cache_folio() allocates a folio before the BLKBSZSET command\nis executed. This results in the allocated folio having an order value\nof 0. Later, after BLKBSZSET is executed, the block size increases to\n0x4000, and the mapping_min_folio_order() calculation result becomes 2.\n\nThis leads to two undesirable consequences:\n\n1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c\nmapping_min_folio_order(mapping)) assertion.\n\n2. The syzbot report [1] shows a null pointer dereference in\ncreate_empty_buffers() due to a buffer head allocation failure.\n\nSynchronization should be established based on the inode between the\nBLKBSZSET command and read cache page to prevent inconsistencies in\nblock size or mapping flags before and after folio allocation.\n\n[1]\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694\nCall Trace:\n folio_create_buffers+0x109/0x150 fs/buffer.c:1802\n block_read_full_folio+0x14c/0x850 fs/buffer.c:2403\n filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496\n do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096\n do_read_cache_page mm/filemap.c:4162 [inline]\n read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195\n btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","status":"published","published":"2026-02-14T17:15:55.853Z","modified":"2026-06-17T10:21:03.047Z","updated_at":"2026-11-02T14:12:05.908608Z"}],"osv":[{"id":"BELL-CVE-2026-23181","status":"published","published":"2026-02-19T06:09:22.302307Z","modified":"2026-06-25T07:18:33.943368042Z","updated_at":"2026-11-02T15:28:23.315185Z"},{"id":"CVE-2026-23181","title":"btrfs: sync read disk super and set block size","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: sync read disk super and set block size\n\nWhen the user performs a btrfs mount, the block device is not set\ncorrectly. The user sets the block size of the block device to 0x4000\nby executing the BLKBSZSET command.\nSince the block size change also changes the mapping-\u003eflags value, this\nfurther affects the result of the mapping_min_folio_order() calculation.\n\nLet's analyze the following two scenarios:\n\nScenario 1: Without executing the BLKBSZSET command, the block size is\n0x1000, and mapping_min_folio_order() returns 0;\n\nScenario 2: After executing the BLKBSZSET command, the block size is\n0x4000, and mapping_min_folio_order() returns 2.\n\ndo_read_cache_folio() allocates a folio before the BLKBSZSET command\nis executed. This results in the allocated folio having an order value\nof 0. Later, after BLKBSZSET is executed, the block size increases to\n0x4000, and the mapping_min_folio_order() calculation result becomes 2.\n\nThis leads to two undesirable consequences:\n\n1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c\nmapping_min_folio_order(mapping)) assertion.\n\n2. The syzbot report [1] shows a null pointer dereference in\ncreate_empty_buffers() due to a buffer head allocation failure.\n\nSynchronization should be established based on the inode between the\nBLKBSZSET command and read cache page to prevent inconsistencies in\nblock size or mapping flags before and after folio allocation.\n\n[1]\nKASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\nRIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694\nCall Trace:\n folio_create_buffers+0x109/0x150 fs/buffer.c:1802\n block_read_full_folio+0x14c/0x850 fs/buffer.c:2403\n filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496\n do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096\n do_read_cache_page mm/filemap.c:4162 [inline]\n read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195\n btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","status":"published","published":"2026-02-14T16:27:12.137Z","modified":"2026-10-28T02:30:54.333568184Z","updated_at":"2026-11-02T15:44:58.749922Z"},{"id":"DEBIAN-CVE-2026-23181","description":"In the Linux kernel, the following vulnerability has been resolved:  btrfs: sync read disk super and set block size  When the user performs a btrfs mount, the block device is not set correctly. The user sets the block size of the block device to 0x4000 by executing the BLKBSZSET command. Since the block size change also changes the mapping-\u003eflags value, this further affects the result of the mapping_min_folio_order() calculation.  Let's analyze the following two scenarios:  Scenario 1: Without executing the BLKBSZSET command, the block size is 0x1000, and mapping_min_folio_order() returns 0;  Scenario 2: After executing the BLKBSZSET command, the block size is 0x4000, and mapping_min_folio_order() returns 2.  do_read_cache_folio() allocates a folio before the BLKBSZSET command is executed. This results in the allocated folio having an order value of 0. Later, after BLKBSZSET is executed, the block size increases to 0x4000, and the mapping_min_folio_order() calculation result becomes 2.  This leads to two undesirable consequences:  1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c mapping_min_folio_order(mapping)) assertion.  2. The syzbot report [1] shows a null pointer dereference in create_empty_buffers() due to a buffer head allocation failure.  Synchronization should be established based on the inode between the BLKBSZSET command and read cache page to prevent inconsistencies in block size or mapping flags before and after folio allocation.  [1] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694 Call Trace:  folio_create_buffers+0x109/0x150 fs/buffer.c:1802  block_read_full_folio+0x14c/0x850 fs/buffer.c:2403  filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496  do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096  do_read_cache_page mm/filemap.c:4162 [inline]  read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195  btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","status":"published","published":"2026-02-14T17:15:55.853Z","modified":"2026-10-01T02:47:55.251182409Z","updated_at":"2026-11-02T15:45:53.516942Z"},{"id":"ROOT-OS-UBUNTU-2204-CVE-2026-23181","title":"CVE-2026-23181 in linux - Patched by Root","description":"Root has patched CVE-2026-23181 in the linux package for Root:Ubuntu:22.04. Multiple fixed versions available.","status":"published","published":"2026-11-06T13:52:25Z","modified":"2026-11-06T14:15:28.755993646Z","updated_at":"2026-11-06T14:57:22.237547Z"},{"id":"ROOT-OS-UBUNTU-2404-CVE-2026-23181","title":"CVE-2026-23181 in linux - Patched by Root","description":"Root has patched CVE-2026-23181 in the linux package for Root:Ubuntu:24.04. Multiple fixed versions available.","status":"published","published":"2026-11-06T15:54:27Z","modified":"2026-11-06T16:17:33.36433166Z","updated_at":"2026-11-06T16:59:13.602872Z"},{"id":"UBUNTU-CVE-2026-23181","description":"In the Linux kernel, the following vulnerability has been resolved: btrfs: sync read disk super and set block size When the user performs a btrfs mount, the block device is not set correctly. The user sets the block size of the block device to 0x4000 by executing the BLKBSZSET command. Since the block size change also changes the mapping-\u003eflags value, this further affects the result of the mapping_min_folio_order() calculation. Let's analyze the following two scenarios: Scenario 1: Without executing the BLKBSZSET command, the block size is 0x1000, and mapping_min_folio_order() returns 0; Scenario 2: After executing the BLKBSZSET command, the block size is 0x4000, and mapping_min_folio_order() returns 2. do_read_cache_folio() allocates a folio before the BLKBSZSET command is executed. This results in the allocated folio having an order value of 0. Later, after BLKBSZSET is executed, the block size increases to 0x4000, and the mapping_min_folio_order() calculation result becomes 2. This leads to two undesirable consequences: 1. filemap_add_folio() triggers a VM_BUG_ON_FOLIO(folio_order(folio) \u003c mapping_min_folio_order(mapping)) assertion. 2. The syzbot report [1] shows a null pointer dereference in create_empty_buffers() due to a buffer head allocation failure. Synchronization should be established based on the inode between the BLKBSZSET command and read cache page to prevent inconsistencies in block size or mapping flags before and after folio allocation. [1] KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:create_empty_buffers+0x4d/0x480 fs/buffer.c:1694 Call Trace:  folio_create_buffers+0x109/0x150 fs/buffer.c:1802  block_read_full_folio+0x14c/0x850 fs/buffer.c:2403  filemap_read_folio+0xc8/0x2a0 mm/filemap.c:2496  do_read_cache_folio+0x266/0x5c0 mm/filemap.c:4096  do_read_cache_page mm/filemap.c:4162 [inline]  read_cache_page_gfp+0x29/0x120 mm/filemap.c:4195  btrfs_read_disk_super+0x192/0x500 fs/btrfs/volumes.c:1367","status":"published","published":"2026-02-14T17:15:00Z","modified":"2026-11-11T09:39:26.576439688Z","updated_at":"2026-11-11T10:01:22.47238Z"}]}}