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CVE-2022-49176 (GCVE-0-2022-49176)

Vulnerability from cvelistv5 – Published: 2025-02-26 01:55 – Updated: 2026-08-12 23:58
VLAI
Title
bfq: fix use-after-free in bfq_dispatch_request
Summary
In the Linux kernel, the following vulnerability has been resolved: bfq: fix use-after-free in bfq_dispatch_request KASAN reports a use-after-free report when doing normal scsi-mq test [69832.239032] ================================================================== [69832.241810] BUG: KASAN: use-after-free in bfq_dispatch_request+0x1045/0x44b0 [69832.243267] Read of size 8 at addr ffff88802622ba88 by task kworker/3:1H/155 [69832.244656] [69832.245007] CPU: 3 PID: 155 Comm: kworker/3:1H Not tainted 5.10.0-10295-g576c6382529e #8 [69832.246626] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014 [69832.249069] Workqueue: kblockd blk_mq_run_work_fn [69832.250022] Call Trace: [69832.250541] dump_stack+0x9b/0xce [69832.251232] ? bfq_dispatch_request+0x1045/0x44b0 [69832.252243] print_address_description.constprop.6+0x3e/0x60 [69832.253381] ? __cpuidle_text_end+0x5/0x5 [69832.254211] ? vprintk_func+0x6b/0x120 [69832.254994] ? bfq_dispatch_request+0x1045/0x44b0 [69832.255952] ? bfq_dispatch_request+0x1045/0x44b0 [69832.256914] kasan_report.cold.9+0x22/0x3a [69832.257753] ? bfq_dispatch_request+0x1045/0x44b0 [69832.258755] check_memory_region+0x1c1/0x1e0 [69832.260248] bfq_dispatch_request+0x1045/0x44b0 [69832.261181] ? bfq_bfqq_expire+0x2440/0x2440 [69832.262032] ? blk_mq_delay_run_hw_queues+0xf9/0x170 [69832.263022] __blk_mq_do_dispatch_sched+0x52f/0x830 [69832.264011] ? blk_mq_sched_request_inserted+0x100/0x100 [69832.265101] __blk_mq_sched_dispatch_requests+0x398/0x4f0 [69832.266206] ? blk_mq_do_dispatch_ctx+0x570/0x570 [69832.267147] ? __switch_to+0x5f4/0xee0 [69832.267898] blk_mq_sched_dispatch_requests+0xdf/0x140 [69832.268946] __blk_mq_run_hw_queue+0xc0/0x270 [69832.269840] blk_mq_run_work_fn+0x51/0x60 [69832.278170] process_one_work+0x6d4/0xfe0 [69832.278984] worker_thread+0x91/0xc80 [69832.279726] ? __kthread_parkme+0xb0/0x110 [69832.280554] ? process_one_work+0xfe0/0xfe0 [69832.281414] kthread+0x32d/0x3f0 [69832.282082] ? kthread_park+0x170/0x170 [69832.282849] ret_from_fork+0x1f/0x30 [69832.283573] [69832.283886] Allocated by task 7725: [69832.284599] kasan_save_stack+0x19/0x40 [69832.285385] __kasan_kmalloc.constprop.2+0xc1/0xd0 [69832.286350] kmem_cache_alloc_node+0x13f/0x460 [69832.287237] bfq_get_queue+0x3d4/0x1140 [69832.287993] bfq_get_bfqq_handle_split+0x103/0x510 [69832.289015] bfq_init_rq+0x337/0x2d50 [69832.289749] bfq_insert_requests+0x304/0x4e10 [69832.290634] blk_mq_sched_insert_requests+0x13e/0x390 [69832.291629] blk_mq_flush_plug_list+0x4b4/0x760 [69832.292538] blk_flush_plug_list+0x2c5/0x480 [69832.293392] io_schedule_prepare+0xb2/0xd0 [69832.294209] io_schedule_timeout+0x13/0x80 [69832.295014] wait_for_common_io.constprop.1+0x13c/0x270 [69832.296137] submit_bio_wait+0x103/0x1a0 [69832.296932] blkdev_issue_discard+0xe6/0x160 [69832.297794] blk_ioctl_discard+0x219/0x290 [69832.298614] blkdev_common_ioctl+0x50a/0x1750 [69832.304715] blkdev_ioctl+0x470/0x600 [69832.305474] block_ioctl+0xde/0x120 [69832.306232] vfs_ioctl+0x6c/0xc0 [69832.306877] __se_sys_ioctl+0x90/0xa0 [69832.307629] do_syscall_64+0x2d/0x40 [69832.308362] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [69832.309382] [69832.309701] Freed by task 155: [69832.310328] kasan_save_stack+0x19/0x40 [69832.311121] kasan_set_track+0x1c/0x30 [69832.311868] kasan_set_free_info+0x1b/0x30 [69832.312699] __kasan_slab_free+0x111/0x160 [69832.313524] kmem_cache_free+0x94/0x460 [69832.314367] bfq_put_queue+0x582/0x940 [69832.315112] __bfq_bfqd_reset_in_service+0x166/0x1d0 [69832.317275] bfq_bfqq_expire+0xb27/0x2440 [69832.318084] bfq_dispatch_request+0x697/0x44b0 [69832.318991] __blk_mq_do_dispatch_sched+0x52f/0x830 [69832.319984] __blk_mq_sched_dispatch_requests+0x398/0x4f0 [69832.321087] blk_mq_sched_dispatch_requests+0xdf/0x140 [69832.322225] __blk_mq_run_hw_queue+0xc0/0x270 [69832.323114] blk_mq_run_work_fn+0x51/0x6 ---truncated---
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-27 18:17 UTC
CWE
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 24bfd19bb7890255693ee5cb6dc100d8d215d00b , < 74e610b5ee0d95e751280567100509eb11517efa (git)
Affected: 24bfd19bb7890255693ee5cb6dc100d8d215d00b , < 5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6 (git)
Affected: 24bfd19bb7890255693ee5cb6dc100d8d215d00b , < df6e00b1a53c57dca82c63b5ecbcad5452231bc7 (git)
Affected: 24bfd19bb7890255693ee5cb6dc100d8d215d00b , < 080665e2c3cbfc68359b9a348a3546ed9b908e7a (git)
Affected: 24bfd19bb7890255693ee5cb6dc100d8d215d00b , < 5687958bf18f84384d809f521210d0f5deed03b0 (git)
Affected: 24bfd19bb7890255693ee5cb6dc100d8d215d00b , < 40b4ba0030e0b02cbacd424ebb9f4c8b0976c786 (git)
Affected: 24bfd19bb7890255693ee5cb6dc100d8d215d00b , < ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a (git)
guessed Create a notification for this product.
Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 4.19.238 , ≤ 4.19.* (semver)
Unaffected: 5.4.189 , ≤ 5.4.* (semver)
Unaffected: 5.10.110 , ≤ 5.10.* (semver)
Unaffected: 5.15.33 , ≤ 5.15.* (semver)
Unaffected: 5.16.19 , ≤ 5.16.* (semver)
Unaffected: 5.17.2 , ≤ 5.17.* (semver)
Unaffected: 5.18 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
  "containers": {
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              "baseSeverity": "HIGH",
              "confidentialityImpact": "HIGH",
              "integrityImpact": "HIGH",
              "privilegesRequired": "LOW",
              "scope": "UNCHANGED",
              "userInteraction": "NONE",
              "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
              "version": "3.1"
            }
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                "role": "CISA Coordinator",
                "timestamp": "2025-02-27T18:17:06.859094Z",
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        "providerMetadata": {
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          "shortName": "CISA-ADP"
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            {
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              "version": "0",
              "versionType": "semver"
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            {
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              "version": "4.19.238",
              "versionType": "semver"
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              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.189",
              "versionType": "semver"
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            {
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              "status": "unaffected",
              "version": "5.17.2",
              "versionType": "semver"
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            {
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              "status": "unaffected",
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                  "vulnerable": true
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                {
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                  "versionEndExcluding": "5.4.189",
                  "versionStartIncluding": "4.15",
                  "vulnerable": true
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                {
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                  "versionEndExcluding": "5.10.110",
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                {
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                {
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              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbfq: fix use-after-free in bfq_dispatch_request\n\nKASAN reports a use-after-free report when doing normal scsi-mq test\n\n[69832.239032] ==================================================================\n[69832.241810] BUG: KASAN: use-after-free in bfq_dispatch_request+0x1045/0x44b0\n[69832.243267] Read of size 8 at addr ffff88802622ba88 by task kworker/3:1H/155\n[69832.244656]\n[69832.245007] CPU: 3 PID: 155 Comm: kworker/3:1H Not tainted 5.10.0-10295-g576c6382529e #8\n[69832.246626] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\n[69832.249069] Workqueue: kblockd blk_mq_run_work_fn\n[69832.250022] Call Trace:\n[69832.250541]  dump_stack+0x9b/0xce\n[69832.251232]  ? bfq_dispatch_request+0x1045/0x44b0\n[69832.252243]  print_address_description.constprop.6+0x3e/0x60\n[69832.253381]  ? __cpuidle_text_end+0x5/0x5\n[69832.254211]  ? vprintk_func+0x6b/0x120\n[69832.254994]  ? bfq_dispatch_request+0x1045/0x44b0\n[69832.255952]  ? bfq_dispatch_request+0x1045/0x44b0\n[69832.256914]  kasan_report.cold.9+0x22/0x3a\n[69832.257753]  ? bfq_dispatch_request+0x1045/0x44b0\n[69832.258755]  check_memory_region+0x1c1/0x1e0\n[69832.260248]  bfq_dispatch_request+0x1045/0x44b0\n[69832.261181]  ? bfq_bfqq_expire+0x2440/0x2440\n[69832.262032]  ? blk_mq_delay_run_hw_queues+0xf9/0x170\n[69832.263022]  __blk_mq_do_dispatch_sched+0x52f/0x830\n[69832.264011]  ? blk_mq_sched_request_inserted+0x100/0x100\n[69832.265101]  __blk_mq_sched_dispatch_requests+0x398/0x4f0\n[69832.266206]  ? blk_mq_do_dispatch_ctx+0x570/0x570\n[69832.267147]  ? __switch_to+0x5f4/0xee0\n[69832.267898]  blk_mq_sched_dispatch_requests+0xdf/0x140\n[69832.268946]  __blk_mq_run_hw_queue+0xc0/0x270\n[69832.269840]  blk_mq_run_work_fn+0x51/0x60\n[69832.278170]  process_one_work+0x6d4/0xfe0\n[69832.278984]  worker_thread+0x91/0xc80\n[69832.279726]  ? __kthread_parkme+0xb0/0x110\n[69832.280554]  ? process_one_work+0xfe0/0xfe0\n[69832.281414]  kthread+0x32d/0x3f0\n[69832.282082]  ? kthread_park+0x170/0x170\n[69832.282849]  ret_from_fork+0x1f/0x30\n[69832.283573]\n[69832.283886] Allocated by task 7725:\n[69832.284599]  kasan_save_stack+0x19/0x40\n[69832.285385]  __kasan_kmalloc.constprop.2+0xc1/0xd0\n[69832.286350]  kmem_cache_alloc_node+0x13f/0x460\n[69832.287237]  bfq_get_queue+0x3d4/0x1140\n[69832.287993]  bfq_get_bfqq_handle_split+0x103/0x510\n[69832.289015]  bfq_init_rq+0x337/0x2d50\n[69832.289749]  bfq_insert_requests+0x304/0x4e10\n[69832.290634]  blk_mq_sched_insert_requests+0x13e/0x390\n[69832.291629]  blk_mq_flush_plug_list+0x4b4/0x760\n[69832.292538]  blk_flush_plug_list+0x2c5/0x480\n[69832.293392]  io_schedule_prepare+0xb2/0xd0\n[69832.294209]  io_schedule_timeout+0x13/0x80\n[69832.295014]  wait_for_common_io.constprop.1+0x13c/0x270\n[69832.296137]  submit_bio_wait+0x103/0x1a0\n[69832.296932]  blkdev_issue_discard+0xe6/0x160\n[69832.297794]  blk_ioctl_discard+0x219/0x290\n[69832.298614]  blkdev_common_ioctl+0x50a/0x1750\n[69832.304715]  blkdev_ioctl+0x470/0x600\n[69832.305474]  block_ioctl+0xde/0x120\n[69832.306232]  vfs_ioctl+0x6c/0xc0\n[69832.306877]  __se_sys_ioctl+0x90/0xa0\n[69832.307629]  do_syscall_64+0x2d/0x40\n[69832.308362]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\n[69832.309382]\n[69832.309701] Freed by task 155:\n[69832.310328]  kasan_save_stack+0x19/0x40\n[69832.311121]  kasan_set_track+0x1c/0x30\n[69832.311868]  kasan_set_free_info+0x1b/0x30\n[69832.312699]  __kasan_slab_free+0x111/0x160\n[69832.313524]  kmem_cache_free+0x94/0x460\n[69832.314367]  bfq_put_queue+0x582/0x940\n[69832.315112]  __bfq_bfqd_reset_in_service+0x166/0x1d0\n[69832.317275]  bfq_bfqq_expire+0xb27/0x2440\n[69832.318084]  bfq_dispatch_request+0x697/0x44b0\n[69832.318991]  __blk_mq_do_dispatch_sched+0x52f/0x830\n[69832.319984]  __blk_mq_sched_dispatch_requests+0x398/0x4f0\n[69832.321087]  blk_mq_sched_dispatch_requests+0xdf/0x140\n[69832.322225]  __blk_mq_run_hw_queue+0xc0/0x270\n[69832.323114]  blk_mq_run_work_fn+0x51/0x6\n---truncated---"
        }
      ],
      "metrics": [
        {
          "cvssV3_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",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is in the BFQ block I/O scheduler dispatch path (bfq_dispatch_request), reached when the local block layer dispatches requests from ordinary local I/O (read/write/ioctl) on a BFQ-scheduled device, not via a network protocol handler.\nAC:L - This is a synchronous dangling-pointer UAF within one locked dispatch call (expire/free of in_serv_queue, then bfq_bfqq_wait_request on the freed object), not a race the attacker cannot control; an unprivileged user can drive the needed queue create/expire/free pattern via I/O from short-lived processes.\nPR:L - Any unprivileged local user who can perform I/O on a filesystem backed by a BFQ device creates bfq_queue objects and exercises the same dispatch path; CAP_SYS_ADMIN is not required along the vulnerable path.\nUI:N - The attacker triggers the bug solely through their own I/O activity; no separate victim action is required.\nS:U - This is standard in-host kernel memory corruption / privilege escalation within the same security authority; it does not cross a VM, IOMMU, or other security boundary.\nC:H - Use-after-free of a bfq_queue slab object (and post-unlock use via bfq_update_dispatch_stats/bfqq_group when debug stats are enabled) enables heap reuse/spray and arbitrary kernel read primitives.\nI:H - The same bfq_queue UAF is exploitable for heap spraying and control-flow hijacking / arbitrary write primitives typical of kernel slab UAFs.\nA:H - The UAF produces kernel oops/panic (as shown by the KASAN report in bfq_dispatch_request) and can be triggered repeatedly to deny service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-12T23:58:13.436Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/74e610b5ee0d95e751280567100509eb11517efa"
        },
        {
          "url": "https://git.kernel.org/stable/c/5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6"
        },
        {
          "url": "https://git.kernel.org/stable/c/df6e00b1a53c57dca82c63b5ecbcad5452231bc7"
        },
        {
          "url": "https://git.kernel.org/stable/c/080665e2c3cbfc68359b9a348a3546ed9b908e7a"
        },
        {
          "url": "https://git.kernel.org/stable/c/5687958bf18f84384d809f521210d0f5deed03b0"
        },
        {
          "url": "https://git.kernel.org/stable/c/40b4ba0030e0b02cbacd424ebb9f4c8b0976c786"
        },
        {
          "url": "https://git.kernel.org/stable/c/ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a"
        }
      ],
      "title": "bfq: fix use-after-free in bfq_dispatch_request",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49176",
    "datePublished": "2025-02-26T01:55:30.586Z",
    "dateReserved": "2025-02-26T01:49:39.280Z",
    "dateUpdated": "2026-08-12T23:58:13.436Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-49176",
      "date": "2026-09-14",
      "epss": "0.00272",
      "percentile": "0.19481"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49176\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:00:54.717\",\"lastModified\":\"2026-08-13T00:17:30.217\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbfq: fix use-after-free in bfq_dispatch_request\\n\\nKASAN reports a use-after-free report when doing normal scsi-mq test\\n\\n[69832.239032] ==================================================================\\n[69832.241810] BUG: KASAN: use-after-free in bfq_dispatch_request+0x1045/0x44b0\\n[69832.243267] Read of size 8 at addr ffff88802622ba88 by task kworker/3:1H/155\\n[69832.244656]\\n[69832.245007] CPU: 3 PID: 155 Comm: kworker/3:1H Not tainted 5.10.0-10295-g576c6382529e #8\\n[69832.246626] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\\n[69832.249069] Workqueue: kblockd blk_mq_run_work_fn\\n[69832.250022] Call Trace:\\n[69832.250541]  dump_stack+0x9b/0xce\\n[69832.251232]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.252243]  print_address_description.constprop.6+0x3e/0x60\\n[69832.253381]  ? __cpuidle_text_end+0x5/0x5\\n[69832.254211]  ? vprintk_func+0x6b/0x120\\n[69832.254994]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.255952]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.256914]  kasan_report.cold.9+0x22/0x3a\\n[69832.257753]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.258755]  check_memory_region+0x1c1/0x1e0\\n[69832.260248]  bfq_dispatch_request+0x1045/0x44b0\\n[69832.261181]  ? bfq_bfqq_expire+0x2440/0x2440\\n[69832.262032]  ? blk_mq_delay_run_hw_queues+0xf9/0x170\\n[69832.263022]  __blk_mq_do_dispatch_sched+0x52f/0x830\\n[69832.264011]  ? blk_mq_sched_request_inserted+0x100/0x100\\n[69832.265101]  __blk_mq_sched_dispatch_requests+0x398/0x4f0\\n[69832.266206]  ? blk_mq_do_dispatch_ctx+0x570/0x570\\n[69832.267147]  ? __switch_to+0x5f4/0xee0\\n[69832.267898]  blk_mq_sched_dispatch_requests+0xdf/0x140\\n[69832.268946]  __blk_mq_run_hw_queue+0xc0/0x270\\n[69832.269840]  blk_mq_run_work_fn+0x51/0x60\\n[69832.278170]  process_one_work+0x6d4/0xfe0\\n[69832.278984]  worker_thread+0x91/0xc80\\n[69832.279726]  ? __kthread_parkme+0xb0/0x110\\n[69832.280554]  ? process_one_work+0xfe0/0xfe0\\n[69832.281414]  kthread+0x32d/0x3f0\\n[69832.282082]  ? kthread_park+0x170/0x170\\n[69832.282849]  ret_from_fork+0x1f/0x30\\n[69832.283573]\\n[69832.283886] Allocated by task 7725:\\n[69832.284599]  kasan_save_stack+0x19/0x40\\n[69832.285385]  __kasan_kmalloc.constprop.2+0xc1/0xd0\\n[69832.286350]  kmem_cache_alloc_node+0x13f/0x460\\n[69832.287237]  bfq_get_queue+0x3d4/0x1140\\n[69832.287993]  bfq_get_bfqq_handle_split+0x103/0x510\\n[69832.289015]  bfq_init_rq+0x337/0x2d50\\n[69832.289749]  bfq_insert_requests+0x304/0x4e10\\n[69832.290634]  blk_mq_sched_insert_requests+0x13e/0x390\\n[69832.291629]  blk_mq_flush_plug_list+0x4b4/0x760\\n[69832.292538]  blk_flush_plug_list+0x2c5/0x480\\n[69832.293392]  io_schedule_prepare+0xb2/0xd0\\n[69832.294209]  io_schedule_timeout+0x13/0x80\\n[69832.295014]  wait_for_common_io.constprop.1+0x13c/0x270\\n[69832.296137]  submit_bio_wait+0x103/0x1a0\\n[69832.296932]  blkdev_issue_discard+0xe6/0x160\\n[69832.297794]  blk_ioctl_discard+0x219/0x290\\n[69832.298614]  blkdev_common_ioctl+0x50a/0x1750\\n[69832.304715]  blkdev_ioctl+0x470/0x600\\n[69832.305474]  block_ioctl+0xde/0x120\\n[69832.306232]  vfs_ioctl+0x6c/0xc0\\n[69832.306877]  __se_sys_ioctl+0x90/0xa0\\n[69832.307629]  do_syscall_64+0x2d/0x40\\n[69832.308362]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n[69832.309382]\\n[69832.309701] Freed by task 155:\\n[69832.310328]  kasan_save_stack+0x19/0x40\\n[69832.311121]  kasan_set_track+0x1c/0x30\\n[69832.311868]  kasan_set_free_info+0x1b/0x30\\n[69832.312699]  __kasan_slab_free+0x111/0x160\\n[69832.313524]  kmem_cache_free+0x94/0x460\\n[69832.314367]  bfq_put_queue+0x582/0x940\\n[69832.315112]  __bfq_bfqd_reset_in_service+0x166/0x1d0\\n[69832.317275]  bfq_bfqq_expire+0xb27/0x2440\\n[69832.318084]  bfq_dispatch_request+0x697/0x44b0\\n[69832.318991]  __blk_mq_do_dispatch_sched+0x52f/0x830\\n[69832.319984]  __blk_mq_sched_dispatch_requests+0x398/0x4f0\\n[69832.321087]  blk_mq_sched_dispatch_requests+0xdf/0x140\\n[69832.322225]  __blk_mq_run_hw_queue+0xc0/0x270\\n[69832.323114]  blk_mq_run_work_fn+0x51/0x6\\n---truncated---\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: bfq: se corrige el use-after-free en bfq_dispatch_request KASAN informa un informe de use-after-free al realizar una prueba scsi-mq normal [69832.239032] ======================================================================== [69832.241810] ERROR: KASAN: use-after-free en bfq_dispatch_request+0x1045/0x44b0 [69832.243267] Lectura de tama\u00f1o 8 en la direcci\u00f3n ffff88802622ba88 por la tarea kworker/3:1H/155 [69832.244656] [69832.245007] CPU: 3 PID: 155 Comm: kworker/3:1H No contaminado 5.10.0-10295-g576c6382529e #8 [69832.246626] Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 01/04/2014 [69832.249069] Cola de trabajo: kblockd blk_mq_run_work_fn [69832.250022] Seguimiento de llamadas: [69832.250541] dump_stack+0x9b/0xce [69832.251232] ? bfq_dispatch_request+0x1045/0x44b0 [69832.252243] print_address_description.constprop.6+0x3e/0x60 [69832.253381] ? __cpuidle_text_end+0x5/0x5 [69832.254211] ? vprintk_func+0x6b/0x120 [69832.254994] ? bfq_dispatch_request+0x1045/0x44b0 [69832.255952] ? bfq_dispatch_request+0x1045/0x44b0 [69832.256914] kasan_report.cold.9+0x22/0x3a [69832.257753] ? bfq_dispatch_request+0x1045/0x44b0 [69832.258755] check_memory_region+0x1c1/0x1e0 [69832.260248] bfq_dispatch_request+0x1045/0x44b0 [69832.261181] ? bfq_bfqq_expire+0x2440/0x2440 [69832.262032] ? blk_mq_delay_run_hw_queues+0xf9/0x170 [69832.263022] __blk_mq_do_dispatch_sched+0x52f/0x830 [69832.264011] ? blk_mq_sched_request_inserted+0x100/0x100 [69832.265101] __blk_mq_sched_dispatch_requests+0x398/0x4f0 [69832.266206] ? blk_mq_do_dispatch_ctx+0x570/0x570 [69832.267147] ? __switch_to+0x5f4/0xee0 [69832.267898] blk_mq_sched_dispatch_requests+0xdf/0x140 [69832.268946] __blk_mq_run_hw_queue+0xc0/0x270 [69832.269840] blk_mq_run_work_fn+0x51/0x60 [69832.278170] process_one_work+0x6d4/0xfe0 [69832.278984] worker_thread+0x91/0xc80 [69832.279726] ? __kthread_parkme+0xb0/0x110 [69832.280554] ? process_one_work+0xfe0/0xfe0 [69832.281414] kthread+0x32d/0x3f0 [69832.282082] ? kthread_park+0x170/0x170 [69832.282849] ret_from_fork+0x1f/0x30 [69832.283573] [69832.283886] Asignado por la tarea 7725: [69832.284599] kasan_save_stack+0x19/0x40 [69832.285385] __kasan_kmalloc.constprop.2+0xc1/0xd0 [69832.286350] kmem_cache_alloc_node+0x13f/0x460 [69832.287237] bfq_get_queue+0x3d4/0x1140 [69832.287993] bfq_get_bfqq_handle_split+0x103/0x510 [69832.289015] bfq_init_rq+0x337/0x2d50 [69832.289749] bfq_insert_requests+0x304/0x4e10 [69832.290634] blk_mq_sched_insert_requests+0x13e/0x390 [69832.291629] blk_mq_flush_plug_list+0x4b4/0x760 [69832.292538] blk_flush_plug_list+0x2c5/0x480 [69832.293392] io_schedule_prepare+0xb2/0xd0 [69832.294209] io_schedule_timeout+0x13/0x80 [69832.295014] wait_for_common_io.constprop.1+0x13c/0x270 [69832.296137] submit_bio_wait+0x103/0x1a0 [69832.296932] blkdev_issue_discard+0xe6/0x160 [69832.297794] blk_ioctl_discard+0x219/0x290 [69832.298614] blkdev_common_ioctl+0x50a/0x1750 [69832.304715] blkdev_ioctl+0x470/0x600 [69832.305474] block_ioctl+0xde/0x120 [69832.306232] vfs_ioctl+0x6c/0xc0 [69832.306877] __se_sys_ioctl+0x90/0xa0 [69832.307629] do_syscall_64+0x2d/0x40 [69832.308362] entry_SYSCALL_64_after_hwframe+0x44/0xa9 [69832.309382] [69832.309701] Freed by task 155: [69832.310328] kasan_save_stack+0x19/0x40 [69832.311121] kasan_set_track+0x1c/0x30 [69832.311868] kasan_set_free_info+0x1b/0x30 [69832.312699] __kasan_slab_free+0x111/0x160 [69832.313524] kmem_cache_free+0x94/0x460 [69832.314367] bfq_put_queue+0x582/0x940 [69832.315112] __bfq_bfqd_reset_in_service+0x166/0x1d0 [69832.317275] bfq_bfqq_expire+0xb27/0x2440 [69832.318084] bfq_dispatch_request+0x697/0x44b0 [69832.318991] __blk_mq_do_dispatch_sched+0x52f/0x830 [69832.319984] __blk_mq_sched_dispatch_requests+0x398/0x4f0 [69832.321087] blk_mq_sched_dispatch_requests+0xdf/0x140 [69832.322225] __blk_mq_run_hw_queue+0xc0/0x270 [69832.323114] blk_mq_run_work_fn+0x51/0x6 ---truncado---\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"block/bfq-iosched.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"24bfd19bb7890255693ee5cb6dc100d8d215d00b\",\"lessThan\":\"74e610b5ee0d95e751280567100509eb11517efa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24bfd19bb7890255693ee5cb6dc100d8d215d00b\",\"lessThan\":\"5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24bfd19bb7890255693ee5cb6dc100d8d215d00b\",\"lessThan\":\"df6e00b1a53c57dca82c63b5ecbcad5452231bc7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24bfd19bb7890255693ee5cb6dc100d8d215d00b\",\"lessThan\":\"080665e2c3cbfc68359b9a348a3546ed9b908e7a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24bfd19bb7890255693ee5cb6dc100d8d215d00b\",\"lessThan\":\"5687958bf18f84384d809f521210d0f5deed03b0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24bfd19bb7890255693ee5cb6dc100d8d215d00b\",\"lessThan\":\"40b4ba0030e0b02cbacd424ebb9f4c8b0976c786\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"24bfd19bb7890255693ee5cb6dc100d8d215d00b\",\"lessThan\":\"ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"block/bfq-iosched.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.15\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.15\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.238\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.189\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.110\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.33\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.16.19\",\"lessThanOrEqual\":\"5.16.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.17.2\",\"lessThanOrEqual\":\"5.17.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.18\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2025-02-27T18:17:06.859094Z\",\"id\":\"CVE-2022-49176\",\"options\":[{\"exploitation\":\"none\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"total\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-416\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"4.19.238\",\"matchCriteriaId\":\"E0B62342-F287-4C6B-92AA-C1BC61DDAFFA\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"4.20\",\"versionEndExcluding\":\"5.4.189\",\"matchCriteriaId\":\"8CB6E8F5-C2B1-46F3-A807-0F6104AC340F\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.5\",\"versionEndExcluding\":\"5.10.110\",\"matchCriteriaId\":\"91D3BFD0-D3F3-4018-957C-96CCBF357D79\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.11\",\"versionEndExcluding\":\"5.15.33\",\"matchCriteriaId\":\"27C42AE8-B387-43E2-938A-E1C8B40BE6D5\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.16\",\"versionEndExcluding\":\"5.16.19\",\"matchCriteriaId\":\"20C43679-0439-405A-B97F-685BEE50613B\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"5.17\",\"versionEndExcluding\":\"5.17.2\",\"matchCriteriaId\":\"210C679C-CF84-44A3-8939-E629C87E54BF\"}]}]}],\"references\":[{\"url\":\"https://git.kernel.org/stable/c/080665e2c3cbfc68359b9a348a3546ed9b908e7a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/40b4ba0030e0b02cbacd424ebb9f4c8b0976c786\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/5687958bf18f84384d809f521210d0f5deed03b0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/74e610b5ee0d95e751280567100509eb11517efa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]},{\"url\":\"https://git.kernel.org/stable/c/df6e00b1a53c57dca82c63b5ecbcad5452231bc7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"tags\":[\"Patch\"]}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-29T21:00:31+00:00",
      "cve": "CVE-2022-49176",
      "id": "CVE-2022-49176",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: bfq: fix use-after-free in bfq_dispatch_request",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49176.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-27T00:52:07Z",
      "cve": "CVE-2022-49176",
      "id": "CVE-2022-49176",
      "initial_release_date": "2025-02-27T03:11:06Z",
      "product_status:known_affected": "410",
      "product_status:known_not_affected": "230",
      "product_status:recommended": "249",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49176",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49176.json",
      "version": "53"
    },
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.8, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\", \"integrityImpact\": \"HIGH\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"LOW\", \"confidentialityImpact\": \"HIGH\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2022-49176\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2025-02-27T18:17:06.859094Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-416\", \"description\": \"CWE-416 Use After Free\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2025-02-27T18:17:08.059Z\"}}], \"cna\": {\"title\": \"bfq: fix use-after-free in bfq_dispatch_request\", \"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 in the BFQ block I/O scheduler dispatch path (bfq_dispatch_request), reached when the local block layer dispatches requests from ordinary local I/O (read/write/ioctl) on a BFQ-scheduled device, not via a network protocol handler.\\nAC:L - This is a synchronous dangling-pointer UAF within one locked dispatch call (expire/free of in_serv_queue, then bfq_bfqq_wait_request on the freed object), not a race the attacker cannot control; an unprivileged user can drive the needed queue create/expire/free pattern via I/O from short-lived processes.\\nPR:L - Any unprivileged local user who can perform I/O on a filesystem backed by a BFQ device creates bfq_queue objects and exercises the same dispatch path; CAP_SYS_ADMIN is not required along the vulnerable path.\\nUI:N - The attacker triggers the bug solely through their own I/O activity; no separate victim action is required.\\nS:U - This is standard in-host kernel memory corruption / privilege escalation within the same security authority; it does not cross a VM, IOMMU, or other security boundary.\\nC:H - Use-after-free of a bfq_queue slab object (and post-unlock use via bfq_update_dispatch_stats/bfqq_group when debug stats are enabled) enables heap reuse/spray and arbitrary kernel read primitives.\\nI:H - The same bfq_queue UAF is exploitable for heap spraying and control-flow hijacking / arbitrary write primitives typical of kernel slab UAFs.\\nA:H - The UAF produces kernel oops/panic (as shown by the KASAN report in bfq_dispatch_request) and can be triggered repeatedly to deny service.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"24bfd19bb7890255693ee5cb6dc100d8d215d00b\", \"lessThan\": \"74e610b5ee0d95e751280567100509eb11517efa\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"24bfd19bb7890255693ee5cb6dc100d8d215d00b\", \"lessThan\": \"5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"24bfd19bb7890255693ee5cb6dc100d8d215d00b\", \"lessThan\": \"df6e00b1a53c57dca82c63b5ecbcad5452231bc7\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"24bfd19bb7890255693ee5cb6dc100d8d215d00b\", \"lessThan\": \"080665e2c3cbfc68359b9a348a3546ed9b908e7a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"24bfd19bb7890255693ee5cb6dc100d8d215d00b\", \"lessThan\": \"5687958bf18f84384d809f521210d0f5deed03b0\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"24bfd19bb7890255693ee5cb6dc100d8d215d00b\", \"lessThan\": \"40b4ba0030e0b02cbacd424ebb9f4c8b0976c786\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"24bfd19bb7890255693ee5cb6dc100d8d215d00b\", \"lessThan\": \"ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a\", \"versionType\": \"git\"}], \"programFiles\": [\"block/bfq-iosched.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.15\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.15\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"4.19.238\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"4.19.*\"}, {\"status\": \"unaffected\", \"version\": \"5.4.189\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.4.*\"}, {\"status\": \"unaffected\", \"version\": \"5.10.110\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.33\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"5.16.19\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.16.*\"}, {\"status\": \"unaffected\", \"version\": \"5.17.2\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.17.*\"}, {\"status\": \"unaffected\", \"version\": \"5.18\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"block/bfq-iosched.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/74e610b5ee0d95e751280567100509eb11517efa\"}, {\"url\": \"https://git.kernel.org/stable/c/5117c9ff4c2ebae0f5c2c262d42a25a8fbc086e6\"}, {\"url\": \"https://git.kernel.org/stable/c/df6e00b1a53c57dca82c63b5ecbcad5452231bc7\"}, {\"url\": \"https://git.kernel.org/stable/c/080665e2c3cbfc68359b9a348a3546ed9b908e7a\"}, {\"url\": \"https://git.kernel.org/stable/c/5687958bf18f84384d809f521210d0f5deed03b0\"}, {\"url\": \"https://git.kernel.org/stable/c/40b4ba0030e0b02cbacd424ebb9f4c8b0976c786\"}, {\"url\": \"https://git.kernel.org/stable/c/ab552fcb17cc9e4afe0e4ac4df95fc7b30e8490a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nbfq: fix use-after-free in bfq_dispatch_request\\n\\nKASAN reports a use-after-free report when doing normal scsi-mq test\\n\\n[69832.239032] ==================================================================\\n[69832.241810] BUG: KASAN: use-after-free in bfq_dispatch_request+0x1045/0x44b0\\n[69832.243267] Read of size 8 at addr ffff88802622ba88 by task kworker/3:1H/155\\n[69832.244656]\\n[69832.245007] CPU: 3 PID: 155 Comm: kworker/3:1H Not tainted 5.10.0-10295-g576c6382529e #8\\n[69832.246626] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.14.0-0-g155821a1990b-prebuilt.qemu.org 04/01/2014\\n[69832.249069] Workqueue: kblockd blk_mq_run_work_fn\\n[69832.250022] Call Trace:\\n[69832.250541]  dump_stack+0x9b/0xce\\n[69832.251232]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.252243]  print_address_description.constprop.6+0x3e/0x60\\n[69832.253381]  ? __cpuidle_text_end+0x5/0x5\\n[69832.254211]  ? vprintk_func+0x6b/0x120\\n[69832.254994]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.255952]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.256914]  kasan_report.cold.9+0x22/0x3a\\n[69832.257753]  ? bfq_dispatch_request+0x1045/0x44b0\\n[69832.258755]  check_memory_region+0x1c1/0x1e0\\n[69832.260248]  bfq_dispatch_request+0x1045/0x44b0\\n[69832.261181]  ? bfq_bfqq_expire+0x2440/0x2440\\n[69832.262032]  ? blk_mq_delay_run_hw_queues+0xf9/0x170\\n[69832.263022]  __blk_mq_do_dispatch_sched+0x52f/0x830\\n[69832.264011]  ? blk_mq_sched_request_inserted+0x100/0x100\\n[69832.265101]  __blk_mq_sched_dispatch_requests+0x398/0x4f0\\n[69832.266206]  ? blk_mq_do_dispatch_ctx+0x570/0x570\\n[69832.267147]  ? __switch_to+0x5f4/0xee0\\n[69832.267898]  blk_mq_sched_dispatch_requests+0xdf/0x140\\n[69832.268946]  __blk_mq_run_hw_queue+0xc0/0x270\\n[69832.269840]  blk_mq_run_work_fn+0x51/0x60\\n[69832.278170]  process_one_work+0x6d4/0xfe0\\n[69832.278984]  worker_thread+0x91/0xc80\\n[69832.279726]  ? __kthread_parkme+0xb0/0x110\\n[69832.280554]  ? process_one_work+0xfe0/0xfe0\\n[69832.281414]  kthread+0x32d/0x3f0\\n[69832.282082]  ? kthread_park+0x170/0x170\\n[69832.282849]  ret_from_fork+0x1f/0x30\\n[69832.283573]\\n[69832.283886] Allocated by task 7725:\\n[69832.284599]  kasan_save_stack+0x19/0x40\\n[69832.285385]  __kasan_kmalloc.constprop.2+0xc1/0xd0\\n[69832.286350]  kmem_cache_alloc_node+0x13f/0x460\\n[69832.287237]  bfq_get_queue+0x3d4/0x1140\\n[69832.287993]  bfq_get_bfqq_handle_split+0x103/0x510\\n[69832.289015]  bfq_init_rq+0x337/0x2d50\\n[69832.289749]  bfq_insert_requests+0x304/0x4e10\\n[69832.290634]  blk_mq_sched_insert_requests+0x13e/0x390\\n[69832.291629]  blk_mq_flush_plug_list+0x4b4/0x760\\n[69832.292538]  blk_flush_plug_list+0x2c5/0x480\\n[69832.293392]  io_schedule_prepare+0xb2/0xd0\\n[69832.294209]  io_schedule_timeout+0x13/0x80\\n[69832.295014]  wait_for_common_io.constprop.1+0x13c/0x270\\n[69832.296137]  submit_bio_wait+0x103/0x1a0\\n[69832.296932]  blkdev_issue_discard+0xe6/0x160\\n[69832.297794]  blk_ioctl_discard+0x219/0x290\\n[69832.298614]  blkdev_common_ioctl+0x50a/0x1750\\n[69832.304715]  blkdev_ioctl+0x470/0x600\\n[69832.305474]  block_ioctl+0xde/0x120\\n[69832.306232]  vfs_ioctl+0x6c/0xc0\\n[69832.306877]  __se_sys_ioctl+0x90/0xa0\\n[69832.307629]  do_syscall_64+0x2d/0x40\\n[69832.308362]  entry_SYSCALL_64_after_hwframe+0x44/0xa9\\n[69832.309382]\\n[69832.309701] Freed by task 155:\\n[69832.310328]  kasan_save_stack+0x19/0x40\\n[69832.311121]  kasan_set_track+0x1c/0x30\\n[69832.311868]  kasan_set_free_info+0x1b/0x30\\n[69832.312699]  __kasan_slab_free+0x111/0x160\\n[69832.313524]  kmem_cache_free+0x94/0x460\\n[69832.314367]  bfq_put_queue+0x582/0x940\\n[69832.315112]  __bfq_bfqd_reset_in_service+0x166/0x1d0\\n[69832.317275]  bfq_bfqq_expire+0xb27/0x2440\\n[69832.318084]  bfq_dispatch_request+0x697/0x44b0\\n[69832.318991]  __blk_mq_do_dispatch_sched+0x52f/0x830\\n[69832.319984]  __blk_mq_sched_dispatch_requests+0x398/0x4f0\\n[69832.321087]  blk_mq_sched_dispatch_requests+0xdf/0x140\\n[69832.322225]  __blk_mq_run_hw_queue+0xc0/0x270\\n[69832.323114]  blk_mq_run_work_fn+0x51/0x6\\n---truncated---\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"4.19.238\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.4.189\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.110\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.33\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.16.19\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.17.2\", \"versionStartIncluding\": \"4.15\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.18\", \"versionStartIncluding\": \"4.15\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-12T23:58:13.436Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2022-49176\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-12T23:58:13.436Z\", \"dateReserved\": \"2025-02-26T01:49:39.280Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2025-02-26T01:55:30.586Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.