{"id":"CVE-2021-47178","aliases":["DEBIAN-CVE-2021-47178","EUVD-2021-33826","GHSA-vmqf-grh3-9rrr","RHSA-2022:1988","ROOT-OS-DEBIAN-11-CVE-2021-47178","UBUNTU-CVE-2021-47178"],"status":"published","title":"scsi: target: core: Avoid smp_processor_id() in preemptible code","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Avoid smp_processor_id() in preemptible code\n\nThe BUG message \"BUG: using smp_processor_id() in preemptible [00000000]\ncode\" was observed for TCMU devices with kernel config DEBUG_PREEMPT.\n\nThe message was observed when blktests block/005 was run on TCMU devices\nwith fileio backend or user:zbc backend [1]. The commit 1130b499b4a7\n(\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\") triggered the\nsymptom. The commit modified work queue to handle commands and changed\n'current-\u003enr_cpu_allowed' at smp_processor_id() call.\n\nThe message was also observed at system shutdown when TCMU devices were not\ncleaned up [2]. The function smp_processor_id() was called in SCSI host\nwork queue for abort handling, and triggered the BUG message. This symptom\nwas observed regardless of the commit 1130b499b4a7 (\"scsi: target:\ntcm_loop: Use LIO wq cmd submission helper\").\n\nTo avoid the preemptible code check at smp_processor_id(), get CPU ID with\nraw_smp_processor_id() instead. The CPU ID is used for performance\nimprovement then thread move to other CPU will not affect the code.\n\n[1]\n\n[   56.468103] run blktests block/005 at 2021-05-12 14:16:38\n[   57.369473] check_preemption_disabled: 85 callbacks suppressed\n[   57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511\n[   57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510\n[   57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506\n[   57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.369617] Call Trace:\n[   57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507\n[   57.369628]  dump_stack+0x6d/0x89\n[   57.369642]  check_preemption_disabled+0xc8/0xd0\n[   57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369655]  __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369695]  target_init_cmd+0x76/0x90 [target_core_mod]\n[   57.369732]  tcm_loop_queuecommand+0x109/0x210 [tcm_loop]\n[   57.369744]  scsi_queue_rq+0x38e/0xc40\n[   57.369761]  __blk_mq_try_issue_directly+0x109/0x1c0\n[   57.369779]  blk_mq_try_issue_directly+0x43/0x90\n[   57.369790]  blk_mq_submit_bio+0x4e5/0x5d0\n[   57.369812]  submit_bio_noacct+0x46e/0x4e0\n[   57.369830]  __blkdev_direct_IO_simple+0x1a3/0x2d0\n[   57.369859]  ? set_init_blocksize.isra.0+0x60/0x60\n[   57.369880]  generic_file_read_iter+0x89/0x160\n[   57.369898]  blkdev_read_iter+0x44/0x60\n[   57.369906]  new_sync_read+0x102/0x170\n[   57.369929]  vfs_read+0xd4/0x160\n[   57.369941]  __x64_sys_pread64+0x6e/0xa0\n[   57.369946]  ? lockdep_hardirqs_on+0x79/0x100\n[   57.369958]  do_syscall_64+0x3a/0x70\n[   57.369965]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   57.369973] RIP: 0033:0x7f7ed4c1399f\n[   57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b\n[   57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011\n[   57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f\n[   57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009\n[   57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001\n[   57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70\n[   57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568\n[   57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.370039] Call Trace:\n[   57.370045]  dump_stack+0x6d/0x89\n[   57.370056]  ch\n---truncated---","severity":{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00583,"percentile":0.4819,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-459"],"published":"2024-03-25T09:16:28Z","modified":"2026-10-15T10:02:34Z","fixes":[{"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":"Red Hat:enterprise_linux:8::baseos","package":"bpftool","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:4.18.0-372.9.1.el8"}]}],"bundled":67},{"source":"osv","ecosystem":"Red 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VE-2021-47501","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47501","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-47544","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2283406","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-47544","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47544","tags":["advisory"]},{"url":"https://lore.kernel.org/linux-cve-announce/2024052440-CVE-2021-47544-ceb5@gregkh/T","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-47556","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2283393","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-47556","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47556","tags":["advisory"]},{"url":"https://lore.kernel.org/linux-cve-announce/2024052443-CVE-2021-47556-558e@gregkh/T","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-47590","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2293237","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-47590","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47590","tags":["advisory"]},{"url":"https://lore.kernel.org/linux-cve-announce/2024061919-CVE-2021-47590-6db0@gregkh/T","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-47614","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2293265","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-47614","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-47614","tags":["advisory"]},{"url":"https://lore.kernel.org/linux-cve-announce/2024061908-CVE-2021-47614-6dd2@gregkh/T","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-0001","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-0001","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-0001","tags":["advisory"]},{"url":"https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/technical-documentation/branch-history-injection.html","tags":["article"]},{"url":"https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00598.html","tags":["article"]},{"url":"https://www.vusec.net/projects/bhi-spectre-bhb/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-0002","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-0002","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-0002","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-0286","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-0286","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-0286","tags":["advisory"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=105cd17a866017b45f3c45901b394c711c97bf40","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-0322","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-0322","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-0322","tags":["advisory"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a2d859e3fc97e79d907761550dbc03ff1b36479c","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-0850","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2060606","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-0850","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-0850","tags":["advisory"]},{"url":"https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ce3aba43599f0b50adbebff133df8d08a3d5fffe","tags":["article"]},{"url":"https://syzkaller.appspot.com/bug?id=78e9ad0e6952a3ca16e8234724b2fa92d041b9b8","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-1011","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-1011","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-1011","tags":["advisory"]},{"url":"https://lore.kernel.org/lkml/20220414110839.241541230@linuxfoundation.org/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-3105","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2153067","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-3105","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-3105","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2022-3106","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2153066","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2022-3106","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2022-3106","tags":["advisory"]},{"url":"https://acces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target: core: Avoid smp_processor_id() in preemptible code","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Avoid smp_processor_id() in preemptible code\n\nThe BUG message \"BUG: using smp_processor_id() in preemptible [00000000]\ncode\" was observed for TCMU devices with kernel config DEBUG_PREEMPT.\n\nThe message was observed when blktests block/005 was run on TCMU devices\nwith fileio backend or user:zbc backend [1]. The commit 1130b499b4a7\n(\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\") triggered the\nsymptom. The commit modified work queue to handle commands and changed\n'current-\u003enr_cpu_allowed' at smp_processor_id() call.\n\nThe message was also observed at system shutdown when TCMU devices were not\ncleaned up [2]. The function smp_processor_id() was called in SCSI host\nwork queue for abort handling, and triggered the BUG message. This symptom\nwas observed regardless of the commit 1130b499b4a7 (\"scsi: target:\ntcm_loop: Use LIO wq cmd submission helper\").\n\nTo avoid the preemptible code check at smp_processor_id(), get CPU ID with\nraw_smp_processor_id() instead. The CPU ID is used for performance\nimprovement then thread move to other CPU will not affect the code.\n\n[1]\n\n[   56.468103] run blktests block/005 at 2021-05-12 14:16:38\n[   57.369473] check_preemption_disabled: 85 callbacks suppressed\n[   57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511\n[   57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510\n[   57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506\n[   57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.369617] Call Trace:\n[   57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507\n[   57.369628]  dump_stack+0x6d/0x89\n[   57.369642]  check_preemption_disabled+0xc8/0xd0\n[   57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369655]  __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369695]  target_init_cmd+0x76/0x90 [target_core_mod]\n[   57.369732]  tcm_loop_queuecommand+0x109/0x210 [tcm_loop]\n[   57.369744]  scsi_queue_rq+0x38e/0xc40\n[   57.369761]  __blk_mq_try_issue_directly+0x109/0x1c0\n[   57.369779]  blk_mq_try_issue_directly+0x43/0x90\n[   57.369790]  blk_mq_submit_bio+0x4e5/0x5d0\n[   57.369812]  submit_bio_noacct+0x46e/0x4e0\n[   57.369830]  __blkdev_direct_IO_simple+0x1a3/0x2d0\n[   57.369859]  ? set_init_blocksize.isra.0+0x60/0x60\n[   57.369880]  generic_file_read_iter+0x89/0x160\n[   57.369898]  blkdev_read_iter+0x44/0x60\n[   57.369906]  new_sync_read+0x102/0x170\n[   57.369929]  vfs_read+0xd4/0x160\n[   57.369941]  __x64_sys_pread64+0x6e/0xa0\n[   57.369946]  ? lockdep_hardirqs_on+0x79/0x100\n[   57.369958]  do_syscall_64+0x3a/0x70\n[   57.369965]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   57.369973] RIP: 0033:0x7f7ed4c1399f\n[   57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b\n[   57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011\n[   57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f\n[   57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009\n[   57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001\n[   57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70\n[   57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568\n[   57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.370039] Call Trace:\n[   57.370045]  dump_stack+0x6d/0x89\n[   57.370056]  ch\n---truncated---","status":"published","published":"2024-03-25T09:16:28.024Z","modified":"2026-08-05T08:46:30.525Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"cna"}],"updated_at":"2026-11-02T14:32:56.308189Z"}],"euvd":[{"id":"EUVD-2021-33826","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Avoid smp_processor_id() in preemptible code\n\nThe BUG message \"BUG: using smp_processor_id() in preemptible [00000000]\ncode\" was observed for TCMU devices with kernel config DEBUG_PREEMPT.\n\nThe message was observed when blktests block/005 was run on TCMU devices\nwith fileio backend or user:zbc backend [1]. The commit 1130b499b4a7\n(\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\") triggered the\nsymptom. The commit modified work queue to handle commands and changed\n'current-\u003enr_cpu_allowed' at smp_processor_id() call.\n\nThe message was also observed at system shutdown when TCMU devices were not\ncleaned up [2]. The function smp_processor_id() was called in SCSI host\nwork queue for abort handling, and triggered the BUG message. This symptom\nwas observed regardless of the commit 1130b499b4a7 (\"scsi: target:\ntcm_loop: Use LIO wq cmd submission helper\").\n\nTo avoid the preemptible code check at smp_processor_id(), get CPU ID with\nraw_smp_processor_id() instead. The CPU ID is used for performance\nimprovement then thread move to other CPU will not affect the code.\n\n[1]\n\n[   56.468103] run blktests block/005 at 2021-05-12 14:16:38\n[   57.369473] check_preemption_disabled: 85 callbacks suppressed\n[   57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511\n[   57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510\n[   57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506\n[   57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.369617] Call Trace:\n[   57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507\n[   57.369628]  dump_stack+0x6d/0x89\n[   57.369642]  check_preemption_disabled+0xc8/0xd0\n[   57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369655]  __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369695]  target_init_cmd+0x76/0x90 [target_core_mod]\n[   57.369732]  tcm_loop_queuecommand+0x109/0x210 [tcm_loop]\n[   57.369744]  scsi_queue_rq+0x38e/0xc40\n[   57.369761]  __blk_mq_try_issue_directly+0x109/0x1c0\n[   57.369779]  blk_mq_try_issue_directly+0x43/0x90\n[   57.369790]  blk_mq_submit_bio+0x4e5/0x5d0\n[   57.369812]  submit_bio_noacct+0x46e/0x4e0\n[   57.369830]  __blkdev_direct_IO_simple+0x1a3/0x2d0\n[   57.369859]  ? set_init_blocksize.isra.0+0x60/0x60\n[   57.369880]  generic_file_read_iter+0x89/0x160\n[   57.369898]  blkdev_read_iter+0x44/0x60\n[   57.369906]  new_sync_read+0x102/0x170\n[   57.369929]  vfs_read+0xd4/0x160\n[   57.369941]  __x64_sys_pread64+0x6e/0xa0\n[   57.369946]  ? lockdep_hardirqs_on+0x79/0x100\n[   57.369958]  do_syscall_64+0x3a/0x70\n[   57.369965]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   57.369973] RIP: 0033:0x7f7ed4c1399f\n[   57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b\n[   57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011\n[   57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f\n[   57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009\n[   57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001\n[   57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70\n[   57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568\n[   57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.370039] Call Trace:\n[   57.370045]  dump_stack+0x6d/0x89\n[   57.370056]  ch\n---truncated---","status":"published","published":"2024-03-25T09:16:28Z","modified":"2026-08-05T08:46:30Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T18:02:21.767149Z"}],"ghsa":[{"id":"GHSA-vmqf-grh3-9rrr","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Avoid...","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Avoid smp_processor_id() in preemptible code\n\nThe BUG message \"BUG: using smp_processor_id() in preemptible [00000000]\ncode\" was observed for TCMU devices with kernel config DEBUG_PREEMPT.\n\nThe message was observed when blktests block/005 was run on TCMU devices\nwith fileio backend or user:zbc backend [1]. The commit 1130b499b4a7\n(\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\") triggered the\nsymptom. The commit modified work queue to handle commands and changed\n'current-\u003enr_cpu_allowed' at smp_processor_id() call.\n\nThe message was also observed at system shutdown when TCMU devices were not\ncleaned up [2]. The function smp_processor_id() was called in SCSI host\nwork queue for abort handling, and triggered the BUG message. This symptom\nwas observed regardless of the commit 1130b499b4a7 (\"scsi: target:\ntcm_loop: Use LIO wq cmd submission helper\").\n\nTo avoid the preemptible code check at smp_processor_id(), get CPU ID with\nraw_smp_processor_id() instead. The CPU ID is used for performance\nimprovement then thread move to other CPU will not affect the code.\n\n[1]\n\n[   56.468103] run blktests block/005 at 2021-05-12 14:16:38\n[   57.369473] check_preemption_disabled: 85 callbacks suppressed\n[   57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511\n[   57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510\n[   57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506\n[   57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.369617] Call Trace:\n[   57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507\n[   57.369628]  dump_stack+0x6d/0x89\n[   57.369642]  check_preemption_disabled+0xc8/0xd0\n[   57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369655]  __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369695]  target_init_cmd+0x76/0x90 [target_core_mod]\n[   57.369732]  tcm_loop_queuecommand+0x109/0x210 [tcm_loop]\n[   57.369744]  scsi_queue_rq+0x38e/0xc40\n[   57.369761]  __blk_mq_try_issue_directly+0x109/0x1c0\n[   57.369779]  blk_mq_try_issue_directly+0x43/0x90\n[   57.369790]  blk_mq_submit_bio+0x4e5/0x5d0\n[   57.369812]  submit_bio_noacct+0x46e/0x4e0\n[   57.369830]  __blkdev_direct_IO_simple+0x1a3/0x2d0\n[   57.369859]  ? set_init_blocksize.isra.0+0x60/0x60\n[   57.369880]  generic_file_read_iter+0x89/0x160\n[   57.369898]  blkdev_read_iter+0x44/0x60\n[   57.369906]  new_sync_read+0x102/0x170\n[   57.369929]  vfs_read+0xd4/0x160\n[   57.369941]  __x64_sys_pread64+0x6e/0xa0\n[   57.369946]  ? lockdep_hardirqs_on+0x79/0x100\n[   57.369958]  do_syscall_64+0x3a/0x70\n[   57.369965]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   57.369973] RIP: 0033:0x7f7ed4c1399f\n[   57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b\n[   57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011\n[   57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f\n[   57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009\n[   57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001\n[   57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70\n[   57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568\n[   57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.370039] Call Trace:\n[   57.370045]  dump_stack+0x6d/0x89\n[   57.370056]  ch\n---truncated---","status":"published","published":"2024-03-25T12:30:52Z","modified":"2025-03-17T15:32:42Z","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-459"],"updated_at":"2026-11-02T15:00:19.012519Z"}],"nvd":[{"id":"CVE-2021-47178","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: core: Avoid smp_processor_id() in preemptible code\n\nThe BUG message \"BUG: using smp_processor_id() in preemptible [00000000]\ncode\" was observed for TCMU devices with kernel config DEBUG_PREEMPT.\n\nThe message was observed when blktests block/005 was run on TCMU devices\nwith fileio backend or user:zbc backend [1]. The commit 1130b499b4a7\n(\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\") triggered the\nsymptom. The commit modified work queue to handle commands and changed\n'current-\u003enr_cpu_allowed' at smp_processor_id() call.\n\nThe message was also observed at system shutdown when TCMU devices were not\ncleaned up [2]. The function smp_processor_id() was called in SCSI host\nwork queue for abort handling, and triggered the BUG message. This symptom\nwas observed regardless of the commit 1130b499b4a7 (\"scsi: target:\ntcm_loop: Use LIO wq cmd submission helper\").\n\nTo avoid the preemptible code check at smp_processor_id(), get CPU ID with\nraw_smp_processor_id() instead. The CPU ID is used for performance\nimprovement then thread move to other CPU will not affect the code.\n\n[1]\n\n[   56.468103] run blktests block/005 at 2021-05-12 14:16:38\n[   57.369473] check_preemption_disabled: 85 callbacks suppressed\n[   57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511\n[   57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510\n[   57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506\n[   57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.369617] Call Trace:\n[   57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507\n[   57.369628]  dump_stack+0x6d/0x89\n[   57.369642]  check_preemption_disabled+0xc8/0xd0\n[   57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369655]  __target_init_cmd+0x157/0x170 [target_core_mod]\n[   57.369695]  target_init_cmd+0x76/0x90 [target_core_mod]\n[   57.369732]  tcm_loop_queuecommand+0x109/0x210 [tcm_loop]\n[   57.369744]  scsi_queue_rq+0x38e/0xc40\n[   57.369761]  __blk_mq_try_issue_directly+0x109/0x1c0\n[   57.369779]  blk_mq_try_issue_directly+0x43/0x90\n[   57.369790]  blk_mq_submit_bio+0x4e5/0x5d0\n[   57.369812]  submit_bio_noacct+0x46e/0x4e0\n[   57.369830]  __blkdev_direct_IO_simple+0x1a3/0x2d0\n[   57.369859]  ? set_init_blocksize.isra.0+0x60/0x60\n[   57.369880]  generic_file_read_iter+0x89/0x160\n[   57.369898]  blkdev_read_iter+0x44/0x60\n[   57.369906]  new_sync_read+0x102/0x170\n[   57.369929]  vfs_read+0xd4/0x160\n[   57.369941]  __x64_sys_pread64+0x6e/0xa0\n[   57.369946]  ? lockdep_hardirqs_on+0x79/0x100\n[   57.369958]  do_syscall_64+0x3a/0x70\n[   57.369965]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[   57.369973] RIP: 0033:0x7f7ed4c1399f\n[   57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b\n[   57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011\n[   57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f\n[   57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009\n[   57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001\n[   57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70\n[   57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568\n[   57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34\n[   57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018\n[   57.370039] Call Trace:\n[   57.370045]  dump_stack+0x6d/0x89\n[   57.370056]  ch\n---truncated---","status":"published","published":"2024-03-25T10:15:09.267Z","modified":"2026-08-04T10:16:50.49Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high","assessor":"secondary"},{"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-459"],"updated_at":"2026-11-02T14:07:08.163458Z"}],"osv":[{"id":"DEBIAN-CVE-2021-47178","description":"In the Linux kernel, the following vulnerability has been resolved:  scsi: target: core: Avoid smp_processor_id() in preemptible code  The BUG message \"BUG: using smp_processor_id() in preemptible [00000000] code\" was observed for TCMU devices with kernel config DEBUG_PREEMPT.  The message was observed when blktests block/005 was run on TCMU devices with fileio backend or user:zbc backend [1]. The commit 1130b499b4a7 (\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\") triggered the symptom. The commit modified work queue to handle commands and changed 'current-\u003enr_cpu_allowed' at smp_processor_id() call.  The message was also observed at system shutdown when TCMU devices were not cleaned up [2]. The function smp_processor_id() was called in SCSI host work queue for abort handling, and triggered the BUG message. This symptom was observed regardless of the commit 1130b499b4a7 (\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\").  To avoid the preemptible code check at smp_processor_id(), get CPU ID with raw_smp_processor_id() instead. The CPU ID is used for performance improvement then thread move to other CPU will not affect the code.  [1]  [   56.468103] run blktests block/005 at 2021-05-12 14:16:38 [   57.369473] check_preemption_disabled: 85 callbacks suppressed [   57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511 [   57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510 [   57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506 [   57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod] [   57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34 [   57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018 [   57.369617] Call Trace: [   57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507 [   57.369628]  dump_stack+0x6d/0x89 [   57.369642]  check_preemption_disabled+0xc8/0xd0 [   57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod] [   57.369655]  __target_init_cmd+0x157/0x170 [target_core_mod] [   57.369695]  target_init_cmd+0x76/0x90 [target_core_mod] [   57.369732]  tcm_loop_queuecommand+0x109/0x210 [tcm_loop] [   57.369744]  scsi_queue_rq+0x38e/0xc40 [   57.369761]  __blk_mq_try_issue_directly+0x109/0x1c0 [   57.369779]  blk_mq_try_issue_directly+0x43/0x90 [   57.369790]  blk_mq_submit_bio+0x4e5/0x5d0 [   57.369812]  submit_bio_noacct+0x46e/0x4e0 [   57.369830]  __blkdev_direct_IO_simple+0x1a3/0x2d0 [   57.369859]  ? set_init_blocksize.isra.0+0x60/0x60 [   57.369880]  generic_file_read_iter+0x89/0x160 [   57.369898]  blkdev_read_iter+0x44/0x60 [   57.369906]  new_sync_read+0x102/0x170 [   57.369929]  vfs_read+0xd4/0x160 [   57.369941]  __x64_sys_pread64+0x6e/0xa0 [   57.369946]  ? lockdep_hardirqs_on+0x79/0x100 [   57.369958]  do_syscall_64+0x3a/0x70 [   57.369965]  entry_SYSCALL_64_after_hwframe+0x44/0xae [   57.369973] RIP: 0033:0x7f7ed4c1399f [   57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b [   57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011 [   57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f [   57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009 [   57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001 [   57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70 [   57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568 [   57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34 [   57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018 [   57.370039] Call Trace: [   57.370045]  dump_stack+0x6d/0x89 [   57.370056]  ch ---truncated---","status":"withdrawn","published":"2024-03-25T10:15:09.267Z","modified":"2025-12-22T07:49:26.2339Z","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":"RHSA-2022:1988","title":"Red Hat Security Advisory: kernel security, bug fix, and enhancement update","status":"published","published":"2024-09-16T06:30:36Z","modified":"2026-10-15T10:02:34Z","cvss":[{"version":"3.1","score":8.2,"vector":"CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:09.62945Z"},{"id":"UBUNTU-CVE-2021-47178","description":"In the Linux kernel, the following vulnerability has been resolved: scsi: target: core: Avoid smp_processor_id() in preemptible code The BUG message \"BUG: using smp_processor_id() in preemptible [00000000] code\" was observed for TCMU devices with kernel config DEBUG_PREEMPT. The message was observed when blktests block/005 was run on TCMU devices with fileio backend or user:zbc backend [1]. The commit 1130b499b4a7 (\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\") triggered the symptom. The commit modified work queue to handle commands and changed 'current-\u003enr_cpu_allowed' at smp_processor_id() call. The message was also observed at system shutdown when TCMU devices were not cleaned up [2]. The function smp_processor_id() was called in SCSI host work queue for abort handling, and triggered the BUG message. This symptom was observed regardless of the commit 1130b499b4a7 (\"scsi: target: tcm_loop: Use LIO wq cmd submission helper\"). To avoid the preemptible code check at smp_processor_id(), get CPU ID with raw_smp_processor_id() instead. The CPU ID is used for performance improvement then thread move to other CPU will not affect the code. [1] [   56.468103] run blktests block/005 at 2021-05-12 14:16:38 [   57.369473] check_preemption_disabled: 85 callbacks suppressed [   57.369480] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1511 [   57.369506] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1510 [   57.369512] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1506 [   57.369552] caller is __target_init_cmd+0x157/0x170 [target_core_mod] [   57.369606] CPU: 4 PID: 1506 Comm: fio Not tainted 5.13.0-rc1+ #34 [   57.369613] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018 [   57.369617] Call Trace: [   57.369621] BUG: using smp_processor_id() in preemptible [00000000] code: fio/1507 [   57.369628]  dump_stack+0x6d/0x89 [   57.369642]  check_preemption_disabled+0xc8/0xd0 [   57.369628] caller is __target_init_cmd+0x157/0x170 [target_core_mod] [   57.369655]  __target_init_cmd+0x157/0x170 [target_core_mod] [   57.369695]  target_init_cmd+0x76/0x90 [target_core_mod] [   57.369732]  tcm_loop_queuecommand+0x109/0x210 [tcm_loop] [   57.369744]  scsi_queue_rq+0x38e/0xc40 [   57.369761]  __blk_mq_try_issue_directly+0x109/0x1c0 [   57.369779]  blk_mq_try_issue_directly+0x43/0x90 [   57.369790]  blk_mq_submit_bio+0x4e5/0x5d0 [   57.369812]  submit_bio_noacct+0x46e/0x4e0 [   57.369830]  __blkdev_direct_IO_simple+0x1a3/0x2d0 [   57.369859]  ? set_init_blocksize.isra.0+0x60/0x60 [   57.369880]  generic_file_read_iter+0x89/0x160 [   57.369898]  blkdev_read_iter+0x44/0x60 [   57.369906]  new_sync_read+0x102/0x170 [   57.369929]  vfs_read+0xd4/0x160 [   57.369941]  __x64_sys_pread64+0x6e/0xa0 [   57.369946]  ? lockdep_hardirqs_on+0x79/0x100 [   57.369958]  do_syscall_64+0x3a/0x70 [   57.369965]  entry_SYSCALL_64_after_hwframe+0x44/0xae [   57.369973] RIP: 0033:0x7f7ed4c1399f [   57.369979] Code: 08 89 3c 24 48 89 4c 24 18 e8 7d f3 ff ff 4c 8b 54 24 18 48 8b 54 24 10 41 89 c0 48 8b 74 24 08 8b 3c 24 b8 11 00 00 00 0f 05 \u003c48\u003e 3d 00 f0 ff ff 77 31 44 89 c7 48 89 04 24 e8 cd f3 ff ff 48 8b [   57.369983] RSP: 002b:00007ffd7918c580 EFLAGS: 00000293 ORIG_RAX: 0000000000000011 [   57.369990] RAX: ffffffffffffffda RBX: 00000000015b4540 RCX: 00007f7ed4c1399f [   57.369993] RDX: 0000000000001000 RSI: 00000000015de000 RDI: 0000000000000009 [   57.369996] RBP: 00000000015b4540 R08: 0000000000000000 R09: 0000000000000001 [   57.369999] R10: 0000000000e5c000 R11: 0000000000000293 R12: 00007f7eb5269a70 [   57.370002] R13: 0000000000000000 R14: 0000000000001000 R15: 00000000015b4568 [   57.370031] CPU: 7 PID: 1507 Comm: fio Not tainted 5.13.0-rc1+ #34 [   57.370036] Hardware name: System manufacturer System Product Name/PRIME Z270-A, BIOS 1302 03/15/2018 [   57.370039] Call Trace: [   57.370045]  dump_stack+0x6d/0x89 [   57.370056]  ch ---truncated---","status":"published","published":"2024-03-25T10:15:00Z","modified":"2026-08-06T03:07:34.848430402Z","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"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T16:53:48.688001Z"},{"id":"ROOT-OS-DEBIAN-11-CVE-2021-47178","title":"CVE-2021-47178 in linux - Patched by Root","description":"Root has patched CVE-2021-47178 in the linux package for Root:Debian:11. Multiple fixed versions available.","status":"published","published":"2026-08-23T09:13:41Z","modified":"2026-08-23T10:19:22.085923217Z","updated_at":"2026-11-02T15:53:28.544053Z"}]}}