202 lines
13 KiB
JSON
202 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2021-47552",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-05-24T15:02:54.832Z",
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"datePublished": "2024-05-24T15:09:55.295Z",
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"dateUpdated": "2026-08-05T08:48:22.040Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:48:22.040Z"
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},
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"descriptions": [
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{
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"lang": "en",
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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't 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 & 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 <48> 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] <TASK>\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] </TASK>\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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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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—not via network packet processing.\nAC:L - An attacker who can issue I/O (scheduling hctx->run_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 “power off”), 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->queuedata 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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"block/blk-core.c",
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"block/blk-mq.c",
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"block/blk-mq.h",
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"block/blk-sysfs.c",
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"block/genhd.c"
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],
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"lessThan": "e03513f58919d9e2bc6df765ca2c9da863d03d90",
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"status": "affected",
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"versionType": "git"
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"lessThan": "2a19b28f7929866e1cec92a3619f4de9f2d20005",
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"status": "affected",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"block/blk-core.c",
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"block/blk-mq.c",
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"block/blk-mq.h",
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"block/blk-sysfs.c",
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{
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"version": "5.2",
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{
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"version": "0",
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"lessThan": "5.2",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.6",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.16",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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}
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"cpeApplicability": [
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}
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"title": "blk-mq: cancel blk-mq dispatch work in both blk_cleanup_queue and disk_release()",
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"content": {
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"timestamp": "2024-06-10T18:51:40.130772Z",
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"id": "CVE-2021-47552",
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"options": [
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