CVE-2022-49702

{
  "id": "CVE-2022-49702",
  "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": "18bb8bbf13c1839b43c9e09e76d397b753989af2",
              "lessThan": "341d33128a940c6634175dcb6ca92dc454cfa7d2",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "18bb8bbf13c1839b43c9e09e76d397b753989af2",
              "lessThan": "9fadb11f1295289e0da4d3342ecb6b92c1c99540",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "18bb8bbf13c1839b43c9e09e76d397b753989af2",
              "lessThan": "31e70e527806c546a72262f2fc3d982ee23c42d3",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/btrfs/disk-io.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.13"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.13",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.51",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "5.18.8",
              "versionType": "semver",
              "lessThanOrEqual": "5.18.*"
            },
            {
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/btrfs/disk-io.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-02-26T07:01:45.827",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/31e70e527806c546a72262f2fc3d982ee23c42d3",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/341d33128a940c6634175dcb6ca92dc454cfa7d2",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/9fadb11f1295289e0da4d3342ecb6b92c1c99540",
      "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\nbtrfs: fix hang during unmount when block group reclaim task is running\n\nWhen we start an unmount, at close_ctree(), if we have the reclaim task\nrunning and in the middle of a data block group relocation, we can trigger\na deadlock when stopping an async reclaim task, producing a trace like the\nfollowing:\n\n[629724.498185] task:kworker/u16:7   state:D stack:    0 pid:681170 ppid:     2 flags:0x00004000\n[629724.499760] Workqueue: events_unbound btrfs_async_reclaim_metadata_space [btrfs]\n[629724.501267] Call Trace:\n[629724.501759]  <TASK>\n[629724.502174]  __schedule+0x3cb/0xed0\n[629724.502842]  schedule+0x4e/0xb0\n[629724.503447]  btrfs_wait_on_delayed_iputs+0x7c/0xc0 [btrfs]\n[629724.504534]  ? prepare_to_wait_exclusive+0xc0/0xc0\n[629724.505442]  flush_space+0x423/0x630 [btrfs]\n[629724.506296]  ? rcu_read_unlock_trace_special+0x20/0x50\n[629724.507259]  ? lock_release+0x220/0x4a0\n[629724.507932]  ? btrfs_get_alloc_profile+0xb3/0x290 [btrfs]\n[629724.508940]  ? do_raw_spin_unlock+0x4b/0xa0\n[629724.509688]  btrfs_async_reclaim_metadata_space+0x139/0x320 [btrfs]\n[629724.510922]  process_one_work+0x252/0x5a0\n[629724.511694]  ? process_one_work+0x5a0/0x5a0\n[629724.512508]  worker_thread+0x52/0x3b0\n[629724.513220]  ? process_one_work+0x5a0/0x5a0\n[629724.514021]  kthread+0xf2/0x120\n[629724.514627]  ? kthread_complete_and_exit+0x20/0x20\n[629724.515526]  ret_from_fork+0x22/0x30\n[629724.516236]  </TASK>\n[629724.516694] task:umount          state:D stack:    0 pid:719055 ppid:695412 flags:0x00004000\n[629724.518269] Call Trace:\n[629724.518746]  <TASK>\n[629724.519160]  __schedule+0x3cb/0xed0\n[629724.519835]  schedule+0x4e/0xb0\n[629724.520467]  schedule_timeout+0xed/0x130\n[629724.521221]  ? lock_release+0x220/0x4a0\n[629724.521946]  ? lock_acquired+0x19c/0x420\n[629724.522662]  ? trace_hardirqs_on+0x1b/0xe0\n[629724.523411]  __wait_for_common+0xaf/0x1f0\n[629724.524189]  ? usleep_range_state+0xb0/0xb0\n[629724.524997]  __flush_work+0x26d/0x530\n[629724.525698]  ? flush_workqueue_prep_pwqs+0x140/0x140\n[629724.526580]  ? lock_acquire+0x1a0/0x310\n[629724.527324]  __cancel_work_timer+0x137/0x1c0\n[629724.528190]  close_ctree+0xfd/0x531 [btrfs]\n[629724.529000]  ? evict_inodes+0x166/0x1c0\n[629724.529510]  generic_shutdown_super+0x74/0x120\n[629724.530103]  kill_anon_super+0x14/0x30\n[629724.530611]  btrfs_kill_super+0x12/0x20 [btrfs]\n[629724.531246]  deactivate_locked_super+0x31/0xa0\n[629724.531817]  cleanup_mnt+0x147/0x1c0\n[629724.532319]  task_work_run+0x5c/0xa0\n[629724.532984]  exit_to_user_mode_prepare+0x1a6/0x1b0\n[629724.533598]  syscall_exit_to_user_mode+0x16/0x40\n[629724.534200]  do_syscall_64+0x48/0x90\n[629724.534667]  entry_SYSCALL_64_after_hwframe+0x44/0xae\n[629724.535318] RIP: 0033:0x7fa2b90437a7\n[629724.535804] RSP: 002b:00007ffe0b7e4458 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6\n[629724.536912] RAX: 0000000000000000 RBX: 00007fa2b9182264 RCX: 00007fa2b90437a7\n[629724.538156] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000555d6cf20dd0\n[629724.539053] RBP: 0000555d6cf20ba0 R08: 0000000000000000 R09: 00007ffe0b7e3200\n[629724.539956] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000\n[629724.540883] R13: 0000555d6cf20dd0 R14: 0000555d6cf20cb0 R15: 0000000000000000\n[629724.541796]  </TASK>\n\nThis happens because:\n\n1) Before entering close_ctree() we have the async block group reclaim\n   task running and relocating a data block group;\n\n2) There's an async metadata (or data) space reclaim task running;\n\n3) We enter close_ctree() and park the cleaner kthread;\n\n4) The async space reclaim task is at flush_space() and runs all the\n   existing delayed iputs;\n\n5) Before the async space reclaim task calls\n   btrfs_wait_on_delayed_iputs(), the block group reclaim task which is\n   doing the data block group relocation, creates a delayed iput at\n   replace_file_extents() (called when COWing leaves that have file extent\n   items pointing to relocated data exten\n---truncated---"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: se corrige un bloqueo durante el desmontaje cuando se está ejecutando la tarea de recuperación del grupo de bloques Cuando iniciamos un desmontaje, en close_ctree(), si tenemos la tarea de recuperación en ejecución y estamos en medio de una reubicación del grupo de bloques de datos, podemos provocar un bloqueo al detener una tarea de recuperación asíncrona, lo que produce un seguimiento como el siguiente: [629724.498185] task:kworker/u16:7 state:D stack: 0 pid:681170 ppid: 2 flags:0x00004000 [629724.499760] Workqueue: events_unbound btrfs_async_reclaim_metadata_space [btrfs] [629724.501267] Call Trace: [629724.501759]  [629724.502174] __schedule+0x3cb/0xed0 [629724.502842] schedule+0x4e/0xb0 [629724.503447] btrfs_wait_on_delayed_iputs+0x7c/0xc0 [btrfs] [629724.504534] ? prepare_to_wait_exclusive+0xc0/0xc0 [629724.505442] flush_space+0x423/0x630 [btrfs] [629724.506296] ? rcu_read_unlock_trace_special+0x20/0x50 [629724.507259] ? lock_release+0x220/0x4a0 [629724.507932] ? btrfs_get_alloc_profile+0xb3/0x290 [btrfs] [629724.508940] ? do_raw_spin_unlock+0x4b/0xa0 [629724.509688] btrfs_async_reclaim_metadata_space+0x139/0x320 [btrfs] [629724.510922] process_one_work+0x252/0x5a0 [629724.511694] ? process_one_work+0x5a0/0x5a0 [629724.512508] worker_thread+0x52/0x3b0 [629724.513220] ? process_one_work+0x5a0/0x5a0 [629724.514021] kthread+0xf2/0x120 [629724.514627] ? kthread_complete_and_exit+0x20/0x20 [629724.515526] ret_from_fork+0x22/0x30 [629724.516236]  [629724.516694] task:umount state:D stack: 0 pid:719055 ppid:695412 flags:0x00004000 [629724.518269] Call Trace: [629724.518746]  [629724.519160] __schedule+0x3cb/0xed0 [629724.519835] schedule+0x4e/0xb0 [629724.520467] schedule_timeout+0xed/0x130 [629724.521221] ? lock_release+0x220/0x4a0 [629724.521946] ? lock_acquired+0x19c/0x420 [629724.522662] ? trace_hardirqs_on+0x1b/0xe0 [629724.523411] __wait_for_common+0xaf/0x1f0 [629724.524189] ? usleep_range_state+0xb0/0xb0 [629724.524997] __flush_work+0x26d/0x530 [629724.525698] ? flush_workqueue_prep_pwqs+0x140/0x140 [629724.526580] ? lock_acquire+0x1a0/0x310 [629724.527324] __cancel_work_timer+0x137/0x1c0 [629724.528190] close_ctree+0xfd/0x531 [btrfs] [629724.529000] ? evict_inodes+0x166/0x1c0 [629724.529510] generic_shutdown_super+0x74/0x120 [629724.530103] kill_anon_super+0x14/0x30 [629724.530611] btrfs_kill_super+0x12/0x20 [btrfs] [629724.531246] deactivate_locked_super+0x31/0xa0 [629724.531817] cleanup_mnt+0x147/0x1c0 [629724.532319] task_work_run+0x5c/0xa0 [629724.532984] exit_to_user_mode_prepare+0x1a6/0x1b0 [629724.533598] syscall_exit_to_user_mode+0x16/0x40 [629724.534200] do_syscall_64+0x48/0x90 [629724.534667] entry_SYSCALL_64_after_hwframe+0x44/0xae [629724.535318] RIP: 0033:0x7fa2b90437a7 [629724.535804] RSP: 002b:00007ffe0b7e4458 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6 [629724.536912] RAX: 0000000000000000 RBX: 00007fa2b9182264 RCX: 00007fa2b90437a7 [629724.538156] RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000555d6cf20dd0 [629724.539053] RBP: 0000555d6cf20ba0 R08: 0000000000000000 R09: 00007ffe0b7e3200 [629724.539956] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 [629724.540883] R13: 0000555d6cf20dd0 R14: 0000555d6cf20cb0 R15: 0000000000000000 [629724.541796]  Esto sucede porque: 1) Antes de ingresar a close_ctree() tenemos la tarea de recuperación de grupo de bloques asíncronos ejecutándose y reubicando un grupo de bloques de datos; 2) Hay una tarea de recuperación de espacio de metadatos (o datos) asíncronos ejecutándose; 3) Ingresamos a close_ctree() y estacionamos el kthread más limpio; 4) La tarea de recuperación de espacio asíncrona está en flush_space() y ejecuta todas las entradas retrasadas existentes; 5) Antes de que la tarea de recuperación de espacio asíncrona llame a btrfs_wait_on_delayed_iputs(), la tarea de recuperación de grupo de bloques que está realizando la reubicación del grupo de bloques de datos, crea una entrada  ---truncada---"
    }
  ],
  "lastModified": "2026-06-17T05:18:54.503",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}