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CVE-2022-50549

Estado: AnalizadaMedia (5.5)—

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

dm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata

Following concurrent processes:

P1(drop cache) P2(kworker) drop_caches_sysctl_handler drop_slab shrink_slab down_read(&shrinker_rwsem) - LOCK A do_shrink_slab super_cache_scan prune_icache_sb dispose_list evict ext4_evict_inode ext4_clear_inode ext4_discard_preallocations ext4_mb_load_buddy_gfp ext4_mb_init_cache ext4_read_block_bitmap_nowait ext4_read_bh_nowait submit_bh dm_submit_bio do_worker process_deferred_bios commit metadata_operation_failed dm_pool_abort_metadata down_write(&pmd->root_lock) - LOCK B __destroy_persistent_data_objects dm_block_manager_destroy dm_bufio_client_destroy unregister_shrinker down_write(&shrinker_rwsem) thin_map | dm_thin_find_block ↓ down_read(&pmd->root_lock) --> ABBA deadlock

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, which triggers hung task:

Funct ---truncated---

Detalles técnicos trazas, registros y código del informe original
[   76.974820] INFO: task kworker/u4:3:63 blocked for more than 15 seconds.
[   76.976019]       Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910
[   76.978521] task:kworker/u4:3    state:D stack:0     pid:63    ppid:2
[   76.978534] Workqueue: dm-thin do_worker
[   76.978552] Call Trace:
[   76.978564]  __schedule+0x6ba/0x10f0
[   76.978582]  schedule+0x9d/0x1e0
[   76.978588]  rwsem_down_write_slowpath+0x587/0xdf0
[   76.978600]  down_write+0xec/0x110
[   76.978607]  unregister_shrinker+0x2c/0xf0
[   76.978616]  dm_bufio_client_destroy+0x116/0x3d0
[   76.978625]  dm_block_manager_destroy+0x19/0x40
[   76.978629]  __destroy_persistent_data_objects+0x5e/0x70
[   76.978636]  dm_pool_abort_metadata+0x8e/0x100
[   76.978643]  metadata_operation_failed+0x86/0x110
[   76.978649]  commit+0x6a/0x230
[   76.978655]  do_worker+0xc6e/0xd90
[   76.978702]  process_one_work+0x269/0x630
[   76.978714]  worker_thread+0x266/0x630
[   76.978730]  kthread+0x151/0x1b0
[   76.978772] INFO: task test.sh:2646 blocked for more than 15 seconds.
[   76.979756]       Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910
[   76.982111] task:test.sh         state:D stack:0     pid:2646  ppid:2459
[   76.982128] Call Trace:
[   76.982139]  __schedule+0x6ba/0x10f0
[   76.982155]  schedule+0x9d/0x1e0
[   76.982159]  rwsem_down_read_slowpath+0x4f4/0x910
[   76.982173]  down_read+0x84/0x170
[   76.982177]  dm_thin_find_block+0x4c/0xd0
[   76.982183]  thin_map+0x201/0x3d0
[   76.982188]  __map_bio+0x5b/0x350
[   76.982195]  dm_submit_bio+0x2b6/0x930
[   76.982202]  __submit_bio+0x123/0x2d0
[   76.982209]  submit_bio_noacct_nocheck+0x101/0x3e0
[   76.982222]  submit_bio_noacct+0x389/0x770
[   76.982227]  submit_bio+0x50/0xc0
[   76.982232]  submit_bh_wbc+0x15e/0x230
[   76.982238]  submit_bh+0x14/0x20
[   76.982241]  ext4_read_bh_nowait+0xc5/0x130
[   76.982247]  ext4_read_block_bitmap_nowait+0x340/0xc60
[   76.982254]  ext4_mb_init_cache+0x1ce/0xdc0
[   76.982259]  ext4_mb_load_buddy_gfp+0x987/0xfa0
[   76.982263]  ext4_discard_preallocations+0x45d/0x830
[   76.982274]  ext4_clear_inode+0x48/0xf0
[   76.982280]  ext4_evict_inode+0xcf/0xc70
[   76.982285]  evict+0x119/0x2b0
[   76.982290]  dispose_list+0x43/0xa0
[   76.982294]  prune_icache_sb+0x64/0x90
[   76.982298]  super_cache_scan+0x155/0x210
[   76.982303]  do_shrink_slab+0x19e/0x4e0
[   76.982310]  shrink_slab+0x2bd/0x450
[   76.982317]  drop_slab+0xcc/0x1a0
[   76.982323]  drop_caches_sysctl_handler+0xb7/0xe0
[   76.982327]  proc_sys_call_handler+0x1bc/0x300
[   76.982331]  proc_sys_write+0x17/0x20
[   76.982334]  vfs_write+0x3d3/0x570
[   76.982342]  ksys_write+0x73/0x160
[   76.982347]  __x64_sys_write+0x1e/0x30
[   76.982352]  do_syscall_64+0x35/0x80
[   76.982357]  entry_SYSCALL_64_after_hwframe+0x63/0xcd

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-50549",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "e49e582965b3694f07a106adc83ddb44aa4f0890",
              "lessThan": "200aa33b5d781e7c0fa6c0c7db9dbcc3f574ce8f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e49e582965b3694f07a106adc83ddb44aa4f0890",
              "lessThan": "7e37578069737b04955c71dd85db8a3bc2709eff",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e49e582965b3694f07a106adc83ddb44aa4f0890",
              "lessThan": "f8c26c33fef588ee54852cffa7cbb9f9d9869405",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e49e582965b3694f07a106adc83ddb44aa4f0890",
              "lessThan": "2d891cc5a1706b6908bceb56af7176a463ee6d62",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e49e582965b3694f07a106adc83ddb44aa4f0890",
              "lessThan": "cdf7a39bcc427febbfe3c3b9fe829825ead96c27",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "e49e582965b3694f07a106adc83ddb44aa4f0890",
              "lessThan": "8111964f1b8524c4bb56b02cd9c7a37725ea21fd",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "drivers/md/dm-thin-metadata.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "3.6"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "3.6",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.4.229",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.163",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.87",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.18",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.4",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "drivers/md/dm-thin-metadata.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-10-07T16:15:39.897",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/200aa33b5d781e7c0fa6c0c7db9dbcc3f574ce8f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/2d891cc5a1706b6908bceb56af7176a463ee6d62",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/7e37578069737b04955c71dd85db8a3bc2709eff",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/8111964f1b8524c4bb56b02cd9c7a37725ea21fd",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/cdf7a39bcc427febbfe3c3b9fe829825ead96c27",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f8c26c33fef588ee54852cffa7cbb9f9d9869405",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-667"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm thin: Fix ABBA deadlock between shrink_slab and dm_pool_abort_metadata\n\nFollowing concurrent processes:\n\n          P1(drop cache)                P2(kworker)\ndrop_caches_sysctl_handler\n drop_slab\n  shrink_slab\n   down_read(&shrinker_rwsem)  - LOCK A\n   do_shrink_slab\n    super_cache_scan\n     prune_icache_sb\n      dispose_list\n       evict\n        ext4_evict_inode\n\t ext4_clear_inode\n\t  ext4_discard_preallocations\n\t   ext4_mb_load_buddy_gfp\n\t    ext4_mb_init_cache\n\t     ext4_read_block_bitmap_nowait\n\t      ext4_read_bh_nowait\n\t       submit_bh\n\t        dm_submit_bio\n\t\t                 do_worker\n\t\t\t\t  process_deferred_bios\n\t\t\t\t   commit\n\t\t\t\t    metadata_operation_failed\n\t\t\t\t     dm_pool_abort_metadata\n\t\t\t\t      down_write(&pmd->root_lock) - LOCK B\n\t\t                      __destroy_persistent_data_objects\n\t\t\t\t       dm_block_manager_destroy\n\t\t\t\t        dm_bufio_client_destroy\n\t\t\t\t         unregister_shrinker\n\t\t\t\t\t  down_write(&shrinker_rwsem)\n\t\t thin_map                            |\n\t\t  dm_thin_find_block                 ↓\n\t\t   down_read(&pmd->root_lock) --> ABBA deadlock\n\n, which triggers hung task:\n\n[   76.974820] INFO: task kworker/u4:3:63 blocked for more than 15 seconds.\n[   76.976019]       Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910\n[   76.978521] task:kworker/u4:3    state:D stack:0     pid:63    ppid:2\n[   76.978534] Workqueue: dm-thin do_worker\n[   76.978552] Call Trace:\n[   76.978564]  __schedule+0x6ba/0x10f0\n[   76.978582]  schedule+0x9d/0x1e0\n[   76.978588]  rwsem_down_write_slowpath+0x587/0xdf0\n[   76.978600]  down_write+0xec/0x110\n[   76.978607]  unregister_shrinker+0x2c/0xf0\n[   76.978616]  dm_bufio_client_destroy+0x116/0x3d0\n[   76.978625]  dm_block_manager_destroy+0x19/0x40\n[   76.978629]  __destroy_persistent_data_objects+0x5e/0x70\n[   76.978636]  dm_pool_abort_metadata+0x8e/0x100\n[   76.978643]  metadata_operation_failed+0x86/0x110\n[   76.978649]  commit+0x6a/0x230\n[   76.978655]  do_worker+0xc6e/0xd90\n[   76.978702]  process_one_work+0x269/0x630\n[   76.978714]  worker_thread+0x266/0x630\n[   76.978730]  kthread+0x151/0x1b0\n[   76.978772] INFO: task test.sh:2646 blocked for more than 15 seconds.\n[   76.979756]       Not tainted 6.1.0-rc4-00011-g8f17dd350364-dirty #910\n[   76.982111] task:test.sh         state:D stack:0     pid:2646  ppid:2459\n[   76.982128] Call Trace:\n[   76.982139]  __schedule+0x6ba/0x10f0\n[   76.982155]  schedule+0x9d/0x1e0\n[   76.982159]  rwsem_down_read_slowpath+0x4f4/0x910\n[   76.982173]  down_read+0x84/0x170\n[   76.982177]  dm_thin_find_block+0x4c/0xd0\n[   76.982183]  thin_map+0x201/0x3d0\n[   76.982188]  __map_bio+0x5b/0x350\n[   76.982195]  dm_submit_bio+0x2b6/0x930\n[   76.982202]  __submit_bio+0x123/0x2d0\n[   76.982209]  submit_bio_noacct_nocheck+0x101/0x3e0\n[   76.982222]  submit_bio_noacct+0x389/0x770\n[   76.982227]  submit_bio+0x50/0xc0\n[   76.982232]  submit_bh_wbc+0x15e/0x230\n[   76.982238]  submit_bh+0x14/0x20\n[   76.982241]  ext4_read_bh_nowait+0xc5/0x130\n[   76.982247]  ext4_read_block_bitmap_nowait+0x340/0xc60\n[   76.982254]  ext4_mb_init_cache+0x1ce/0xdc0\n[   76.982259]  ext4_mb_load_buddy_gfp+0x987/0xfa0\n[   76.982263]  ext4_discard_preallocations+0x45d/0x830\n[   76.982274]  ext4_clear_inode+0x48/0xf0\n[   76.982280]  ext4_evict_inode+0xcf/0xc70\n[   76.982285]  evict+0x119/0x2b0\n[   76.982290]  dispose_list+0x43/0xa0\n[   76.982294]  prune_icache_sb+0x64/0x90\n[   76.982298]  super_cache_scan+0x155/0x210\n[   76.982303]  do_shrink_slab+0x19e/0x4e0\n[   76.982310]  shrink_slab+0x2bd/0x450\n[   76.982317]  drop_slab+0xcc/0x1a0\n[   76.982323]  drop_caches_sysctl_handler+0xb7/0xe0\n[   76.982327]  proc_sys_call_handler+0x1bc/0x300\n[   76.982331]  proc_sys_write+0x17/0x20\n[   76.982334]  vfs_write+0x3d3/0x570\n[   76.982342]  ksys_write+0x73/0x160\n[   76.982347]  __x64_sys_write+0x1e/0x30\n[   76.982352]  do_syscall_64+0x35/0x80\n[   76.982357]  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nFunct\n---truncated---"
    }
  ],
  "lastModified": "2026-06-17T05:23:46.303",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "0EE55E32-079C-4462-8EC8-3133A29D588B",
              "versionEndExcluding": "5.4.229",
              "versionStartIncluding": "3.6"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "D05D31FC-BD74-4F9E-B1D8-9CED62BE6F65",
              "versionEndExcluding": "5.10.163",
              "versionStartIncluding": "5.5"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "7B9E5B1C-CD46-4790-9500-615863850401",
              "versionEndExcluding": "5.15.87",
              "versionStartIncluding": "5.11"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "08D38C5F-9644-4549-BBA6-F0860F024D14",
              "versionEndExcluding": "6.0.18",
              "versionStartIncluding": "5.16"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "BC4189D9-5478-4E88-A78D-9C1DE29B217C",
              "versionEndExcluding": "6.1.4",
              "versionStartIncluding": "6.1"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}