CVE-2021-47552 (GCVE-0-2021-47552)
Vulnerability from cvelistv5
Published
2024-05-24 15:09
Modified
2026-08-05 08:48
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release() For avoiding to slow down queue destroy, we don't call blk_mq_quiesce_queue() in blk_cleanup_queue(), instead of delaying to cancel dispatch work in blk_release_queue(). However, this way has caused kernel oops[1], reported by Changhui. The log shows that scsi_device can be freed before running blk_release_queue(), which is expected too since scsi_device is released after the scsi disk is closed and the scsi_device is removed. Fixes the issue by canceling blk-mq dispatch work in both blk_cleanup_queue() and disk_release(): 1) when disk_release() is run, the disk has been closed, and any sync dispatch activities have been done, so canceling dispatch work is enough to quiesce filesystem I/O dispatch activity. 2) in blk_cleanup_queue(), we only focus on passthrough request, and passthrough request is always explicitly allocated & freed by its caller, so once queue is frozen, all sync dispatch activity for passthrough request has been done, then it is enough to just cancel dispatch work for avoiding any dispatch activity. [1] kernel panic log [12622.769416] BUG: kernel NULL pointer dereference, address: 0000000000000300 [12622.777186] #PF: supervisor read access in kernel mode [12622.782918] #PF: error_code(0x0000) - not-present page [12622.788649] PGD 0 P4D 0 [12622.791474] Oops: 0000 [#1] PREEMPT SMP PTI [12622.796138] CPU: 10 PID: 744 Comm: kworker/10:1H Kdump: loaded Not tainted 5.15.0+ #1 [12622.804877] Hardware name: Dell Inc. PowerEdge R730/0H21J3, BIOS 1.5.4 10/002/2015 [12622.813321] Workqueue: kblockd blk_mq_run_work_fn [12622.818572] RIP: 0010:sbitmap_get+0x75/0x190 [12622.823336] Code: 85 80 00 00 00 41 8b 57 08 85 d2 0f 84 b1 00 00 00 45 31 e4 48 63 cd 48 8d 1c 49 48 c1 e3 06 49 03 5f 10 4c 8d 6b 40 83 f0 01 <48> 8b 33 44 89 f2 4c 89 ef 0f b6 c8 e8 fa f3 ff ff 83 f8 ff 75 58 [12622.844290] RSP: 0018:ffffb00a446dbd40 EFLAGS: 00010202 [12622.850120] RAX: 0000000000000001 RBX: 0000000000000300 RCX: 0000000000000004 [12622.858082] RDX: 0000000000000006 RSI: 0000000000000082 RDI: ffffa0b7a2dfe030 [12622.866042] RBP: 0000000000000004 R08: 0000000000000001 R09: ffffa0b742721334 [12622.874003] R10: 0000000000000008 R11: 0000000000000008 R12: 0000000000000000 [12622.881964] R13: 0000000000000340 R14: 0000000000000000 R15: ffffa0b7a2dfe030 [12622.889926] FS: 0000000000000000(0000) GS:ffffa0baafb40000(0000) knlGS:0000000000000000 [12622.898956] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [12622.905367] CR2: 0000000000000300 CR3: 0000000641210001 CR4: 00000000001706e0 [12622.913328] Call Trace: [12622.916055] <TASK> [12622.918394] scsi_mq_get_budget+0x1a/0x110 [12622.922969] __blk_mq_do_dispatch_sched+0x1d4/0x320 [12622.928404] ? pick_next_task_fair+0x39/0x390 [12622.933268] __blk_mq_sched_dispatch_requests+0xf4/0x140 [12622.939194] blk_mq_sched_dispatch_requests+0x30/0x60 [12622.944829] __blk_mq_run_hw_queue+0x30/0xa0 [12622.949593] process_one_work+0x1e8/0x3c0 [12622.954059] worker_thread+0x50/0x3b0 [12622.958144] ? rescuer_thread+0x370/0x370 [12622.962616] kthread+0x158/0x180 [12622.966218] ? set_kthread_struct+0x40/0x40 [12622.970884] ret_from_fork+0x22/0x30 [12622.974875] </TASK> [12622.977309] Modules linked in: scsi_debug rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs sunrpc dm_multipath intel_rapl_msr intel_rapl_common dell_wmi_descriptor sb_edac rfkill video x86_pkg_temp_thermal intel_powerclamp dcdbas coretemp kvm_intel kvm mgag200 irqbypass i2c_algo_bit rapl drm_kms_helper ipmi_ssif intel_cstate intel_uncore syscopyarea sysfillrect sysimgblt fb_sys_fops pcspkr cec mei_me lpc_ich mei ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter drm fuse xfs libcrc32c sr_mod cdrom sd_mod t10_pi sg ixgbe ahci libahci crct10dif_pclmul crc32_pclmul crc32c_intel libata megaraid_sas ghash_clmulni_intel tg3 wdat_w ---truncated---
References
Impacted products
Vendor Product Version
Linux Linux Version: 1b97871b501f1bac0fd39a073c4c8473ee457a55
Version: 1b97871b501f1bac0fd39a073c4c8473ee457a55
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()\n\nFor avoiding to slow down queue destroy, we don\u0027t call\nblk_mq_quiesce_queue() in blk_cleanup_queue(), instead of delaying to\ncancel dispatch work in blk_release_queue().\n\nHowever, this way has caused kernel oops[1], reported by Changhui. The log\nshows that scsi_device can be freed before running blk_release_queue(),\nwhich is expected too since scsi_device is released after the scsi disk\nis closed and the scsi_device is removed.\n\nFixes the issue by canceling blk-mq dispatch work in both blk_cleanup_queue()\nand disk_release():\n\n1) when disk_release() is run, the disk has been closed, and any sync\ndispatch activities have been done, so canceling dispatch work is enough to\nquiesce filesystem I/O dispatch activity.\n\n2) in blk_cleanup_queue(), we only focus on passthrough request, and\npassthrough request is always explicitly allocated \u0026 freed by\nits caller, so once queue is frozen, all sync dispatch activity\nfor passthrough request has been done, then it is enough to just cancel\ndispatch work for avoiding any dispatch activity.\n\n[1] kernel panic log\n[12622.769416] BUG: kernel NULL pointer dereference, address: 0000000000000300\n[12622.777186] #PF: supervisor read access in kernel mode\n[12622.782918] #PF: error_code(0x0000) - not-present page\n[12622.788649] PGD 0 P4D 0\n[12622.791474] Oops: 0000 [#1] PREEMPT SMP PTI\n[12622.796138] CPU: 10 PID: 744 Comm: kworker/10:1H Kdump: loaded Not tainted 5.15.0+ #1\n[12622.804877] Hardware name: Dell Inc. PowerEdge R730/0H21J3, BIOS 1.5.4 10/002/2015\n[12622.813321] Workqueue: kblockd blk_mq_run_work_fn\n[12622.818572] RIP: 0010:sbitmap_get+0x75/0x190\n[12622.823336] Code: 85 80 00 00 00 41 8b 57 08 85 d2 0f 84 b1 00 00 00 45 31 e4 48 63 cd 48 8d 1c 49 48 c1 e3 06 49 03 5f 10 4c 8d 6b 40 83 f0 01 \u003c48\u003e 8b 33 44 89 f2 4c 89 ef 0f b6 c8 e8 fa f3 ff ff 83 f8 ff 75 58\n[12622.844290] RSP: 0018:ffffb00a446dbd40 EFLAGS: 00010202\n[12622.850120] RAX: 0000000000000001 RBX: 0000000000000300 RCX: 0000000000000004\n[12622.858082] RDX: 0000000000000006 RSI: 0000000000000082 RDI: ffffa0b7a2dfe030\n[12622.866042] RBP: 0000000000000004 R08: 0000000000000001 R09: ffffa0b742721334\n[12622.874003] R10: 0000000000000008 R11: 0000000000000008 R12: 0000000000000000\n[12622.881964] R13: 0000000000000340 R14: 0000000000000000 R15: ffffa0b7a2dfe030\n[12622.889926] FS:  0000000000000000(0000) GS:ffffa0baafb40000(0000) knlGS:0000000000000000\n[12622.898956] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[12622.905367] CR2: 0000000000000300 CR3: 0000000641210001 CR4: 00000000001706e0\n[12622.913328] Call Trace:\n[12622.916055]  \u003cTASK\u003e\n[12622.918394]  scsi_mq_get_budget+0x1a/0x110\n[12622.922969]  __blk_mq_do_dispatch_sched+0x1d4/0x320\n[12622.928404]  ? pick_next_task_fair+0x39/0x390\n[12622.933268]  __blk_mq_sched_dispatch_requests+0xf4/0x140\n[12622.939194]  blk_mq_sched_dispatch_requests+0x30/0x60\n[12622.944829]  __blk_mq_run_hw_queue+0x30/0xa0\n[12622.949593]  process_one_work+0x1e8/0x3c0\n[12622.954059]  worker_thread+0x50/0x3b0\n[12622.958144]  ? rescuer_thread+0x370/0x370\n[12622.962616]  kthread+0x158/0x180\n[12622.966218]  ? set_kthread_struct+0x40/0x40\n[12622.970884]  ret_from_fork+0x22/0x30\n[12622.974875]  \u003c/TASK\u003e\n[12622.977309] Modules linked in: scsi_debug rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs sunrpc dm_multipath intel_rapl_msr intel_rapl_common dell_wmi_descriptor sb_edac rfkill video x86_pkg_temp_thermal intel_powerclamp dcdbas coretemp kvm_intel kvm mgag200 irqbypass i2c_algo_bit rapl drm_kms_helper ipmi_ssif intel_cstate intel_uncore syscopyarea sysfillrect sysimgblt fb_sys_fops pcspkr cec mei_me lpc_ich mei ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter drm fuse xfs libcrc32c sr_mod cdrom sd_mod t10_pi sg ixgbe ahci libahci crct10dif_pclmul crc32_pclmul crc32c_intel libata megaraid_sas ghash_clmulni_intel tg3 wdat_w\n---truncated---"
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      "title": "blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()",
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    "datePublished": "2024-05-24T15:09:55.295Z",
    "dateReserved": "2024-05-24T15:02:54.832Z",
    "dateUpdated": "2026-08-05T08:48:22.040Z",
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      "containers": "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e03513f58919d9e2bc6df765ca2c9da863d03d90\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://git.kernel.org/stable/c/2a19b28f7929866e1cec92a3619f4de9f2d20005\", \"tags\": [\"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T05:39:59.804Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2021-47552\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-06-10T18:51:40.130772Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-06-10T18:51:47.272Z\"}}], \"cna\": {\"title\": \"blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 7.8, \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:L - The bug is reached through local block-layer teardown (SCSI device removal / disk_release / blk_cleanup_queue), for example via sysfs delete, module unload, or removable USB storage power-off\\u2014not via network packet processing.\\nAC:L - An attacker who can issue I/O (scheduling hctx-\u003erun_work) and then remove the device controls both sides of the lifetime gap; the pending dispatch work reliably runs after scsi_device is freed because cancel was deferred to blk_release_queue.\\nPR:L - A normal local user can trigger removal of removable SCSI/USB block devices they are allowed to use (e.g. desktop seat polkit/udisks \\u201cpower off\\u201d), without needing real init-namespace root or userns-unreachable capabilities.\\nUI:N - The attacker performs I/O and device removal themselves; no separate victim action is required.\\nS:U - Impact stays within the local kernel/host authority (UAF in blk-mq/SCSI), with no VM/IOMMU/sandbox boundary crossing.\\nC:H - q-\u003equeuedata remains a dangling pointer to the freed scsi_device while dispatch work can still call scsi_mq_get_budget/sbitmap_get; that UAF can be sprayed to obtain arbitrary kernel read primitives.\\nI:H - The same post-free scsi_device/sbitmap object is attacker-controllable via heap spray, enabling corrupted map pointers and write/control-flow primitives through the dispatch get_budget path.\\nA:H - The reported failure is a kernel NULL deref/oops in sbitmap_get from kblockd (and any UAF here can equally crash the kernel), so availability impact is high.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"1b97871b501f1bac0fd39a073c4c8473ee457a55\", \"lessThan\": \"e03513f58919d9e2bc6df765ca2c9da863d03d90\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"1b97871b501f1bac0fd39a073c4c8473ee457a55\", \"lessThan\": \"2a19b28f7929866e1cec92a3619f4de9f2d20005\", \"versionType\": \"git\"}], \"programFiles\": [\"block/blk-core.c\", \"block/blk-mq.c\", \"block/blk-mq.h\", \"block/blk-sysfs.c\", \"block/genhd.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.2\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.2\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.15.6\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"block/blk-core.c\", \"block/blk-mq.c\", \"block/blk-mq.h\", \"block/blk-sysfs.c\", \"block/genhd.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/e03513f58919d9e2bc6df765ca2c9da863d03d90\"}, {\"url\": \"https://git.kernel.org/stable/c/2a19b28f7929866e1cec92a3619f4de9f2d20005\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nblk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()\\n\\nFor avoiding to slow down queue destroy, we don\u0027t call\\nblk_mq_quiesce_queue() in blk_cleanup_queue(), instead of delaying to\\ncancel dispatch work in blk_release_queue().\\n\\nHowever, this way has caused kernel oops[1], reported by Changhui. The log\\nshows that scsi_device can be freed before running blk_release_queue(),\\nwhich is expected too since scsi_device is released after the scsi disk\\nis closed and the scsi_device is removed.\\n\\nFixes the issue by canceling blk-mq dispatch work in both blk_cleanup_queue()\\nand disk_release():\\n\\n1) when disk_release() is run, the disk has been closed, and any sync\\ndispatch activities have been done, so canceling dispatch work is enough to\\nquiesce filesystem I/O dispatch activity.\\n\\n2) in blk_cleanup_queue(), we only focus on passthrough request, and\\npassthrough request is always explicitly allocated \u0026 freed by\\nits caller, so once queue is frozen, all sync dispatch activity\\nfor passthrough request has been done, then it is enough to just cancel\\ndispatch work for avoiding any dispatch activity.\\n\\n[1] kernel panic log\\n[12622.769416] BUG: kernel NULL pointer dereference, address: 0000000000000300\\n[12622.777186] #PF: supervisor read access in kernel mode\\n[12622.782918] #PF: error_code(0x0000) - not-present page\\n[12622.788649] PGD 0 P4D 0\\n[12622.791474] Oops: 0000 [#1] PREEMPT SMP PTI\\n[12622.796138] CPU: 10 PID: 744 Comm: kworker/10:1H Kdump: loaded Not tainted 5.15.0+ #1\\n[12622.804877] Hardware name: Dell Inc. PowerEdge R730/0H21J3, BIOS 1.5.4 10/002/2015\\n[12622.813321] Workqueue: kblockd blk_mq_run_work_fn\\n[12622.818572] RIP: 0010:sbitmap_get+0x75/0x190\\n[12622.823336] Code: 85 80 00 00 00 41 8b 57 08 85 d2 0f 84 b1 00 00 00 45 31 e4 48 63 cd 48 8d 1c 49 48 c1 e3 06 49 03 5f 10 4c 8d 6b 40 83 f0 01 \u003c48\u003e 8b 33 44 89 f2 4c 89 ef 0f b6 c8 e8 fa f3 ff ff 83 f8 ff 75 58\\n[12622.844290] RSP: 0018:ffffb00a446dbd40 EFLAGS: 00010202\\n[12622.850120] RAX: 0000000000000001 RBX: 0000000000000300 RCX: 0000000000000004\\n[12622.858082] RDX: 0000000000000006 RSI: 0000000000000082 RDI: ffffa0b7a2dfe030\\n[12622.866042] RBP: 0000000000000004 R08: 0000000000000001 R09: ffffa0b742721334\\n[12622.874003] R10: 0000000000000008 R11: 0000000000000008 R12: 0000000000000000\\n[12622.881964] R13: 0000000000000340 R14: 0000000000000000 R15: ffffa0b7a2dfe030\\n[12622.889926] FS:  0000000000000000(0000) GS:ffffa0baafb40000(0000) knlGS:0000000000000000\\n[12622.898956] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[12622.905367] CR2: 0000000000000300 CR3: 0000000641210001 CR4: 00000000001706e0\\n[12622.913328] Call Trace:\\n[12622.916055]  \u003cTASK\u003e\\n[12622.918394]  scsi_mq_get_budget+0x1a/0x110\\n[12622.922969]  __blk_mq_do_dispatch_sched+0x1d4/0x320\\n[12622.928404]  ? pick_next_task_fair+0x39/0x390\\n[12622.933268]  __blk_mq_sched_dispatch_requests+0xf4/0x140\\n[12622.939194]  blk_mq_sched_dispatch_requests+0x30/0x60\\n[12622.944829]  __blk_mq_run_hw_queue+0x30/0xa0\\n[12622.949593]  process_one_work+0x1e8/0x3c0\\n[12622.954059]  worker_thread+0x50/0x3b0\\n[12622.958144]  ? rescuer_thread+0x370/0x370\\n[12622.962616]  kthread+0x158/0x180\\n[12622.966218]  ? set_kthread_struct+0x40/0x40\\n[12622.970884]  ret_from_fork+0x22/0x30\\n[12622.974875]  \u003c/TASK\u003e\\n[12622.977309] Modules linked in: scsi_debug rpcsec_gss_krb5 auth_rpcgss nfsv4 dns_resolver nfs lockd grace fscache netfs sunrpc dm_multipath intel_rapl_msr intel_rapl_common dell_wmi_descriptor sb_edac rfkill video x86_pkg_temp_thermal intel_powerclamp dcdbas coretemp kvm_intel kvm mgag200 irqbypass i2c_algo_bit rapl drm_kms_helper ipmi_ssif intel_cstate intel_uncore syscopyarea sysfillrect sysimgblt fb_sys_fops pcspkr cec mei_me lpc_ich mei ipmi_si ipmi_devintf ipmi_msghandler acpi_power_meter drm fuse xfs libcrc32c sr_mod cdrom sd_mod t10_pi sg ixgbe ahci libahci crct10dif_pclmul crc32_pclmul crc32c_intel libata megaraid_sas ghash_clmulni_intel tg3 wdat_w\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.6\", \"versionStartIncluding\": \"5.2\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16\", \"versionStartIncluding\": \"5.2\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T08:48:22.040Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2021-47552\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T08:48:22.040Z\", \"dateReserved\": \"2024-05-24T15:02:54.832Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-05-24T15:09:55.295Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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