Vulnerability-Lookup

GHSA-W9CR-RPV2-57QV

Vulnerability from github – Published: 2024-05-21 15:31 – Updated: 2024-12-23 21:30

Details

In the Linux kernel, the following vulnerability has been resolved:

blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd

KASAN reports a use-after-free report when doing fuzz test:

[693354.104835] ================================================================== [693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160 [693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338

[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147 [693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018 [693354.105612] Call Trace: [693354.105621] dump_stack+0xf1/0x19b [693354.105626] ? show_regs_print_info+0x5/0x5 [693354.105634] ? printk+0x9c/0xc3 [693354.105638] ? cpumask_weight+0x1f/0x1f [693354.105648] print_address_description+0x70/0x360 [693354.105654] kasan_report+0x1b2/0x330 [693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105670] bfq_io_set_weight_legacy+0xd3/0x160 [693354.105675] ? bfq_cpd_init+0x20/0x20 [693354.105683] cgroup_file_write+0x3aa/0x510 [693354.105693] ? slaballoc+0x507/0x540 [693354.105698] ? cgroup_file_poll+0x60/0x60 [693354.105702] ? 0xffffffff89600000 [693354.105708] ? usercopy_abort+0x90/0x90 [693354.105716] ? mutex_lock+0xef/0x180 [693354.105726] kernfs_fop_write+0x1ab/0x280 [693354.105732] ? cgroup_file_poll+0x60/0x60 [693354.105738] vfs_write+0xe7/0x230 [693354.105744] ksys_write+0xb0/0x140 [693354.105749] ? ia32_sys_read+0x50/0x50 [693354.105760] do_syscall_64+0x112/0x370 [693354.105766] ? syscall_return_slowpath+0x260/0x260 [693354.105772] ? do_page_fault+0x9b/0x270 [693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0 [693354.105784] ? enter_from_user_mode+0x30/0x30 [693354.105793] entry_SYSCALL_64_after_hwframe+0x65/0xca

[693354.105875] Allocated by task 1453337: [693354.106001] kasan_kmalloc+0xa0/0xd0 [693354.106006] kmem_cache_alloc_node_trace+0x108/0x220 [693354.106010] bfq_pd_alloc+0x96/0x120 [693354.106015] blkcg_activate_policy+0x1b7/0x2b0 [693354.106020] bfq_create_group_hierarchy+0x1e/0x80 [693354.106026] bfq_init_queue+0x678/0x8c0 [693354.106031] blk_mq_init_sched+0x1f8/0x460 [693354.106037] elevator_switch_mq+0xe1/0x240 [693354.106041] elevator_switch+0x25/0x40 [693354.106045] elv_iosched_store+0x1a1/0x230 [693354.106049] queue_attr_store+0x78/0xb0 [693354.106053] kernfs_fop_write+0x1ab/0x280 [693354.106056] vfs_write+0xe7/0x230 [693354.106060] ksys_write+0xb0/0x140 [693354.106064] do_syscall_64+0x112/0x370 [693354.106069] entry_SYSCALL_64_after_hwframe+0x65/0xca

[693354.106114] Freed by task 1453336: [693354.106225] __kasan_slab_free+0x130/0x180 [693354.106229] kfree+0x90/0x1b0 [693354.106233] blkcg_deactivate_policy+0x12c/0x220 [693354.106238] bfq_exit_queue+0xf5/0x110 [693354.106241] blk_mq_exit_sched+0x104/0x130 [693354.106245] __elevator_exit+0x45/0x60 [693354.106249] elevator_switch_mq+0xd6/0x240 [693354.106253] elevator_switch+0x25/0x40 [693354.106257] elv_iosched_store+0x1a1/0x230 [693354.106261] queue_attr_store+0x78/0xb0 [693354.106264] kernfs_fop_write+0x1ab/0x280 [693354.106268] vfs_write+0xe7/0x230 [693354.106271] ksys_write+0xb0/0x140 [693354.106275] do_syscall_64+0x112/0x370 [693354.106280] entry_SYSCALL_64_after_hwframe+0x65/0xca

[693354.106329] The buggy address belongs to the object at ffff888be0a35580 which belongs to the cache kmalloc-1k of size 1024 [693354.106736] The buggy address is located 228 bytes inside of 1024-byte region [ffff888be0a35580, ffff888be0a35980) [693354.107114] The buggy address belongs to the page: [693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0 [693354.107606] flags: 0x17ffffc0008100(slab|head) [693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080 [693354.108020] r ---truncated---

Severity

7.8 (High)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2021-47379"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-416"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-05-21T15:15:23Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\n\nKASAN reports a use-after-free report when doing fuzz test:\n\n[693354.104835] ==================================================================\n[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338\n\n[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147\n[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018\n[693354.105612] Call Trace:\n[693354.105621]  dump_stack+0xf1/0x19b\n[693354.105626]  ? show_regs_print_info+0x5/0x5\n[693354.105634]  ? printk+0x9c/0xc3\n[693354.105638]  ? cpumask_weight+0x1f/0x1f\n[693354.105648]  print_address_description+0x70/0x360\n[693354.105654]  kasan_report+0x1b2/0x330\n[693354.105659]  ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105665]  ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105670]  bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105675]  ? bfq_cpd_init+0x20/0x20\n[693354.105683]  cgroup_file_write+0x3aa/0x510\n[693354.105693]  ? ___slab_alloc+0x507/0x540\n[693354.105698]  ? cgroup_file_poll+0x60/0x60\n[693354.105702]  ? 0xffffffff89600000\n[693354.105708]  ? usercopy_abort+0x90/0x90\n[693354.105716]  ? mutex_lock+0xef/0x180\n[693354.105726]  kernfs_fop_write+0x1ab/0x280\n[693354.105732]  ? cgroup_file_poll+0x60/0x60\n[693354.105738]  vfs_write+0xe7/0x230\n[693354.105744]  ksys_write+0xb0/0x140\n[693354.105749]  ? __ia32_sys_read+0x50/0x50\n[693354.105760]  do_syscall_64+0x112/0x370\n[693354.105766]  ? syscall_return_slowpath+0x260/0x260\n[693354.105772]  ? do_page_fault+0x9b/0x270\n[693354.105779]  ? prepare_exit_to_usermode+0xf9/0x1a0\n[693354.105784]  ? enter_from_user_mode+0x30/0x30\n[693354.105793]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.105875] Allocated by task 1453337:\n[693354.106001]  kasan_kmalloc+0xa0/0xd0\n[693354.106006]  kmem_cache_alloc_node_trace+0x108/0x220\n[693354.106010]  bfq_pd_alloc+0x96/0x120\n[693354.106015]  blkcg_activate_policy+0x1b7/0x2b0\n[693354.106020]  bfq_create_group_hierarchy+0x1e/0x80\n[693354.106026]  bfq_init_queue+0x678/0x8c0\n[693354.106031]  blk_mq_init_sched+0x1f8/0x460\n[693354.106037]  elevator_switch_mq+0xe1/0x240\n[693354.106041]  elevator_switch+0x25/0x40\n[693354.106045]  elv_iosched_store+0x1a1/0x230\n[693354.106049]  queue_attr_store+0x78/0xb0\n[693354.106053]  kernfs_fop_write+0x1ab/0x280\n[693354.106056]  vfs_write+0xe7/0x230\n[693354.106060]  ksys_write+0xb0/0x140\n[693354.106064]  do_syscall_64+0x112/0x370\n[693354.106069]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106114] Freed by task 1453336:\n[693354.106225]  __kasan_slab_free+0x130/0x180\n[693354.106229]  kfree+0x90/0x1b0\n[693354.106233]  blkcg_deactivate_policy+0x12c/0x220\n[693354.106238]  bfq_exit_queue+0xf5/0x110\n[693354.106241]  blk_mq_exit_sched+0x104/0x130\n[693354.106245]  __elevator_exit+0x45/0x60\n[693354.106249]  elevator_switch_mq+0xd6/0x240\n[693354.106253]  elevator_switch+0x25/0x40\n[693354.106257]  elv_iosched_store+0x1a1/0x230\n[693354.106261]  queue_attr_store+0x78/0xb0\n[693354.106264]  kernfs_fop_write+0x1ab/0x280\n[693354.106268]  vfs_write+0xe7/0x230\n[693354.106271]  ksys_write+0xb0/0x140\n[693354.106275]  do_syscall_64+0x112/0x370\n[693354.106280]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106329] The buggy address belongs to the object at ffff888be0a35580\n                 which belongs to the cache kmalloc-1k of size 1024\n[693354.106736] The buggy address is located 228 bytes inside of\n                 1024-byte region [ffff888be0a35580, ffff888be0a35980)\n[693354.107114] The buggy address belongs to the page:\n[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0\n[693354.107606] flags: 0x17ffffc0008100(slab|head)\n[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080\n[693354.108020] r\n---truncated---",
  "id": "GHSA-w9cr-rpv2-57qv",
  "modified": "2024-12-23T21:30:51Z",
  "published": "2024-05-21T15:31:44Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47379"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2021-47379 (GCVE-0-2021-47379)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:03 – Updated: 2026-05-23 15:19

Title

blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd

Summary

In the Linux kernel, the following vulnerability has been resolved: blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd KASAN reports a use-after-free report when doing fuzz test: [693354.104835] ================================================================== [693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160 [693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338 [693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147 [693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018 [693354.105612] Call Trace: [693354.105621] dump_stack+0xf1/0x19b [693354.105626] ? show_regs_print_info+0x5/0x5 [693354.105634] ? printk+0x9c/0xc3 [693354.105638] ? cpumask_weight+0x1f/0x1f [693354.105648] print_address_description+0x70/0x360 [693354.105654] kasan_report+0x1b2/0x330 [693354.105659] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105665] ? bfq_io_set_weight_legacy+0xd3/0x160 [693354.105670] bfq_io_set_weight_legacy+0xd3/0x160 [693354.105675] ? bfq_cpd_init+0x20/0x20 [693354.105683] cgroup_file_write+0x3aa/0x510 [693354.105693] ? ___slab_alloc+0x507/0x540 [693354.105698] ? cgroup_file_poll+0x60/0x60 [693354.105702] ? 0xffffffff89600000 [693354.105708] ? usercopy_abort+0x90/0x90 [693354.105716] ? mutex_lock+0xef/0x180 [693354.105726] kernfs_fop_write+0x1ab/0x280 [693354.105732] ? cgroup_file_poll+0x60/0x60 [693354.105738] vfs_write+0xe7/0x230 [693354.105744] ksys_write+0xb0/0x140 [693354.105749] ? __ia32_sys_read+0x50/0x50 [693354.105760] do_syscall_64+0x112/0x370 [693354.105766] ? syscall_return_slowpath+0x260/0x260 [693354.105772] ? do_page_fault+0x9b/0x270 [693354.105779] ? prepare_exit_to_usermode+0xf9/0x1a0 [693354.105784] ? enter_from_user_mode+0x30/0x30 [693354.105793] entry_SYSCALL_64_after_hwframe+0x65/0xca [693354.105875] Allocated by task 1453337: [693354.106001] kasan_kmalloc+0xa0/0xd0 [693354.106006] kmem_cache_alloc_node_trace+0x108/0x220 [693354.106010] bfq_pd_alloc+0x96/0x120 [693354.106015] blkcg_activate_policy+0x1b7/0x2b0 [693354.106020] bfq_create_group_hierarchy+0x1e/0x80 [693354.106026] bfq_init_queue+0x678/0x8c0 [693354.106031] blk_mq_init_sched+0x1f8/0x460 [693354.106037] elevator_switch_mq+0xe1/0x240 [693354.106041] elevator_switch+0x25/0x40 [693354.106045] elv_iosched_store+0x1a1/0x230 [693354.106049] queue_attr_store+0x78/0xb0 [693354.106053] kernfs_fop_write+0x1ab/0x280 [693354.106056] vfs_write+0xe7/0x230 [693354.106060] ksys_write+0xb0/0x140 [693354.106064] do_syscall_64+0x112/0x370 [693354.106069] entry_SYSCALL_64_after_hwframe+0x65/0xca [693354.106114] Freed by task 1453336: [693354.106225] __kasan_slab_free+0x130/0x180 [693354.106229] kfree+0x90/0x1b0 [693354.106233] blkcg_deactivate_policy+0x12c/0x220 [693354.106238] bfq_exit_queue+0xf5/0x110 [693354.106241] blk_mq_exit_sched+0x104/0x130 [693354.106245] __elevator_exit+0x45/0x60 [693354.106249] elevator_switch_mq+0xd6/0x240 [693354.106253] elevator_switch+0x25/0x40 [693354.106257] elv_iosched_store+0x1a1/0x230 [693354.106261] queue_attr_store+0x78/0xb0 [693354.106264] kernfs_fop_write+0x1ab/0x280 [693354.106268] vfs_write+0xe7/0x230 [693354.106271] ksys_write+0xb0/0x140 [693354.106275] do_syscall_64+0x112/0x370 [693354.106280] entry_SYSCALL_64_after_hwframe+0x65/0xca [693354.106329] The buggy address belongs to the object at ffff888be0a35580 which belongs to the cache kmalloc-1k of size 1024 [693354.106736] The buggy address is located 228 bytes inside of 1024-byte region [ffff888be0a35580, ffff888be0a35980) [693354.107114] The buggy address belongs to the page: [693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0 [693354.107606] flags: 0x17ffffc0008100(slab|head) [693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080 [693354.108020] r ---truncated---

Severity

No CVSS data available.

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2024-06-11 18:56 UTC

Assigner

Linux mitre root

References

4 references

URL	Tags
https://git.kernel.org/stable/c/d12ddd843f1877de1…
https://git.kernel.org/stable/c/f58d305887ad7b249…
https://git.kernel.org/stable/c/7c2c69e010431b015…
https://git.kernel.org/stable/c/858560b27645e7e97…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08 (git) Affected: 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < f58d305887ad7b24986d58e881f6806bb81b2bdf (git) Affected: 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < 7c2c69e010431b0157c9454adcdd2305809bf9fb (git) Affected: 946b81da114b8ba5c74bb01e57c0c6eca2bdc801 , < 858560b27645e7e97aca37ee8f232cccd658fbd2 (git) Affected: 9d5e2d69705fed4ab527f5a283b90ae602f4e0fd (git) Affected: 3ca6e949b751fa3dfbf475ce635364cef543738b (git) Affected: 4.14.51 , < 4.15 (semver) Affected: 4.16.17 , < 4.17 (semver)
Linux	Linux	Affected: 4.17 Unaffected: 0 , < 4.17 (semver) Unaffected: 5.4.150 , ≤ 5.4.* (semver) Unaffected: 5.10.70 , ≤ 5.10.* (semver) Unaffected: 5.14.9 , ≤ 5.14.* (semver) Unaffected: 5.15 , ≤ * (original_commit_for_fix)

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2021-47379",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2024-06-11T18:56:11.466478Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2024-06-11T18:56:25.435Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      },
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T05:32:08.606Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08",
              "status": "affected",
              "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801",
              "versionType": "git"
            },
            {
              "lessThan": "f58d305887ad7b24986d58e881f6806bb81b2bdf",
              "status": "affected",
              "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801",
              "versionType": "git"
            },
            {
              "lessThan": "7c2c69e010431b0157c9454adcdd2305809bf9fb",
              "status": "affected",
              "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801",
              "versionType": "git"
            },
            {
              "lessThan": "858560b27645e7e97aca37ee8f232cccd658fbd2",
              "status": "affected",
              "version": "946b81da114b8ba5c74bb01e57c0c6eca2bdc801",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "9d5e2d69705fed4ab527f5a283b90ae602f4e0fd",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "3ca6e949b751fa3dfbf475ce635364cef543738b",
              "versionType": "git"
            },
            {
              "lessThan": "4.15",
              "status": "affected",
              "version": "4.14.51",
              "versionType": "semver"
            },
            {
              "lessThan": "4.17",
              "status": "affected",
              "version": "4.16.17",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "block/blk-cgroup.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.17"
            },
            {
              "lessThan": "4.17",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.4.*",
              "status": "unaffected",
              "version": "5.4.150",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.70",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.14.*",
              "status": "unaffected",
              "version": "5.14.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.15",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.4.150",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.10.70",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.14.9",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15",
                  "versionStartIncluding": "4.17",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.14.51",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "4.16.17",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nblk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd\n\nKASAN reports a use-after-free report when doing fuzz test:\n\n[693354.104835] ==================================================================\n[693354.105094] BUG: KASAN: use-after-free in bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105336] Read of size 4 at addr ffff888be0a35664 by task sh/1453338\n\n[693354.105607] CPU: 41 PID: 1453338 Comm: sh Kdump: loaded Not tainted 4.18.0-147\n[693354.105610] Hardware name: Huawei 2288H V5/BC11SPSCB0, BIOS 0.81 07/02/2018\n[693354.105612] Call Trace:\n[693354.105621]  dump_stack+0xf1/0x19b\n[693354.105626]  ? show_regs_print_info+0x5/0x5\n[693354.105634]  ? printk+0x9c/0xc3\n[693354.105638]  ? cpumask_weight+0x1f/0x1f\n[693354.105648]  print_address_description+0x70/0x360\n[693354.105654]  kasan_report+0x1b2/0x330\n[693354.105659]  ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105665]  ? bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105670]  bfq_io_set_weight_legacy+0xd3/0x160\n[693354.105675]  ? bfq_cpd_init+0x20/0x20\n[693354.105683]  cgroup_file_write+0x3aa/0x510\n[693354.105693]  ? ___slab_alloc+0x507/0x540\n[693354.105698]  ? cgroup_file_poll+0x60/0x60\n[693354.105702]  ? 0xffffffff89600000\n[693354.105708]  ? usercopy_abort+0x90/0x90\n[693354.105716]  ? mutex_lock+0xef/0x180\n[693354.105726]  kernfs_fop_write+0x1ab/0x280\n[693354.105732]  ? cgroup_file_poll+0x60/0x60\n[693354.105738]  vfs_write+0xe7/0x230\n[693354.105744]  ksys_write+0xb0/0x140\n[693354.105749]  ? __ia32_sys_read+0x50/0x50\n[693354.105760]  do_syscall_64+0x112/0x370\n[693354.105766]  ? syscall_return_slowpath+0x260/0x260\n[693354.105772]  ? do_page_fault+0x9b/0x270\n[693354.105779]  ? prepare_exit_to_usermode+0xf9/0x1a0\n[693354.105784]  ? enter_from_user_mode+0x30/0x30\n[693354.105793]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.105875] Allocated by task 1453337:\n[693354.106001]  kasan_kmalloc+0xa0/0xd0\n[693354.106006]  kmem_cache_alloc_node_trace+0x108/0x220\n[693354.106010]  bfq_pd_alloc+0x96/0x120\n[693354.106015]  blkcg_activate_policy+0x1b7/0x2b0\n[693354.106020]  bfq_create_group_hierarchy+0x1e/0x80\n[693354.106026]  bfq_init_queue+0x678/0x8c0\n[693354.106031]  blk_mq_init_sched+0x1f8/0x460\n[693354.106037]  elevator_switch_mq+0xe1/0x240\n[693354.106041]  elevator_switch+0x25/0x40\n[693354.106045]  elv_iosched_store+0x1a1/0x230\n[693354.106049]  queue_attr_store+0x78/0xb0\n[693354.106053]  kernfs_fop_write+0x1ab/0x280\n[693354.106056]  vfs_write+0xe7/0x230\n[693354.106060]  ksys_write+0xb0/0x140\n[693354.106064]  do_syscall_64+0x112/0x370\n[693354.106069]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106114] Freed by task 1453336:\n[693354.106225]  __kasan_slab_free+0x130/0x180\n[693354.106229]  kfree+0x90/0x1b0\n[693354.106233]  blkcg_deactivate_policy+0x12c/0x220\n[693354.106238]  bfq_exit_queue+0xf5/0x110\n[693354.106241]  blk_mq_exit_sched+0x104/0x130\n[693354.106245]  __elevator_exit+0x45/0x60\n[693354.106249]  elevator_switch_mq+0xd6/0x240\n[693354.106253]  elevator_switch+0x25/0x40\n[693354.106257]  elv_iosched_store+0x1a1/0x230\n[693354.106261]  queue_attr_store+0x78/0xb0\n[693354.106264]  kernfs_fop_write+0x1ab/0x280\n[693354.106268]  vfs_write+0xe7/0x230\n[693354.106271]  ksys_write+0xb0/0x140\n[693354.106275]  do_syscall_64+0x112/0x370\n[693354.106280]  entry_SYSCALL_64_after_hwframe+0x65/0xca\n\n[693354.106329] The buggy address belongs to the object at ffff888be0a35580\n                 which belongs to the cache kmalloc-1k of size 1024\n[693354.106736] The buggy address is located 228 bytes inside of\n                 1024-byte region [ffff888be0a35580, ffff888be0a35980)\n[693354.107114] The buggy address belongs to the page:\n[693354.107273] page:ffffea002f828c00 count:1 mapcount:0 mapping:ffff888107c17080 index:0x0 compound_mapcount: 0\n[693354.107606] flags: 0x17ffffc0008100(slab|head)\n[693354.107760] raw: 0017ffffc0008100 ffffea002fcbc808 ffffea0030bd3a08 ffff888107c17080\n[693354.108020] r\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-23T15:19:51.664Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/d12ddd843f1877de1f7dd2aeea4907cf9ff3ac08"
        },
        {
          "url": "https://git.kernel.org/stable/c/f58d305887ad7b24986d58e881f6806bb81b2bdf"
        },
        {
          "url": "https://git.kernel.org/stable/c/7c2c69e010431b0157c9454adcdd2305809bf9fb"
        },
        {
          "url": "https://git.kernel.org/stable/c/858560b27645e7e97aca37ee8f232cccd658fbd2"
        }
      ],
      "title": "blk-cgroup: fix UAF by grabbing blkcg lock before destroying blkg pd",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2021-47379",
    "datePublished": "2024-05-21T15:03:41.677Z",
    "dateReserved": "2024-05-21T14:58:30.811Z",
    "dateUpdated": "2026-05-23T15:19:51.664Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.