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CVE-2022-50620

Estado: AplazadaSin puntuar—

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

f2fs: fix to invalidate dcc->f2fs_issue_discard in error path

Syzbot reports a NULL pointer dereference issue as below:

The root cause of this issue is in error path of f2fs_start_discard_thread(), it missed to invalidate dcc->f2fs_issue_discard, later kthread_stop() may access invalid pointer.

Detalles técnicos trazas, registros y código del informe original
 __refcount_add include/linux/refcount.h:193 [inline]
 __refcount_inc include/linux/refcount.h:250 [inline]
 refcount_inc include/linux/refcount.h:267 [inline]
 get_task_struct include/linux/sched/task.h:110 [inline]
 kthread_stop+0x34/0x1c0 kernel/kthread.c:703
 f2fs_stop_discard_thread+0x3c/0x5c fs/f2fs/segment.c:1638
 kill_f2fs_super+0x5c/0x194 fs/f2fs/super.c:4522
 deactivate_locked_super+0x70/0xe8 fs/super.c:332
 deactivate_super+0xd0/0xd4 fs/super.c:363
 cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186
 __cleanup_mnt+0x20/0x30 fs/namespace.c:1193
 task_work_run+0xc4/0x14c kernel/task_work.c:177
 exit_task_work include/linux/task_work.h:38 [inline]
 do_exit+0x26c/0xbe0 kernel/exit.c:795
 do_group_exit+0x60/0xe8 kernel/exit.c:925
 __do_sys_exit_group kernel/exit.c:936 [inline]
 __se_sys_exit_group kernel/exit.c:934 [inline]
 __wake_up_parent+0x0/0x40 kernel/exit.c:934
 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]
 invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]
 el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142
 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206
 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636
 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654
 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581

CVSS

NVD no ha asignado puntuación CVSS a esta CVE (habitual desde el cambio de política de abril de 2026).

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)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-50620",
  "cveTags": [],
  "metrics": {},
  "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": "4d67490498acb4ffcef5ba7bc44990d46e66a44c",
              "lessThan": "865bb7b5a7deeb0e5afbd82381d52d38825dc64d",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4d67490498acb4ffcef5ba7bc44990d46e66a44c",
              "lessThan": "a3e517a6ba695d683ee63615e1ea6e6b4c7d2732",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4d67490498acb4ffcef5ba7bc44990d46e66a44c",
              "lessThan": "ae6c960a82c52c3bda5adc82d90643d6c12d308e",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4d67490498acb4ffcef5ba7bc44990d46e66a44c",
              "lessThan": "91586ce0d39a05f88795aa8814fb99b1387236b3",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "fs/f2fs/segment.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.15"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "5.15.86",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.1.*"
            },
            {
              "status": "unaffected",
              "version": "6.2",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "fs/f2fs/segment.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-08T02:15:47.870",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/865bb7b5a7deeb0e5afbd82381d52d38825dc64d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/91586ce0d39a05f88795aa8814fb99b1387236b3",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/a3e517a6ba695d683ee63615e1ea6e6b4c7d2732",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/ae6c960a82c52c3bda5adc82d90643d6c12d308e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Deferred",
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to invalidate dcc->f2fs_issue_discard in error path\n\nSyzbot reports a NULL pointer dereference issue as below:\n\n __refcount_add include/linux/refcount.h:193 [inline]\n __refcount_inc include/linux/refcount.h:250 [inline]\n refcount_inc include/linux/refcount.h:267 [inline]\n get_task_struct include/linux/sched/task.h:110 [inline]\n kthread_stop+0x34/0x1c0 kernel/kthread.c:703\n f2fs_stop_discard_thread+0x3c/0x5c fs/f2fs/segment.c:1638\n kill_f2fs_super+0x5c/0x194 fs/f2fs/super.c:4522\n deactivate_locked_super+0x70/0xe8 fs/super.c:332\n deactivate_super+0xd0/0xd4 fs/super.c:363\n cleanup_mnt+0x1f8/0x234 fs/namespace.c:1186\n __cleanup_mnt+0x20/0x30 fs/namespace.c:1193\n task_work_run+0xc4/0x14c kernel/task_work.c:177\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0x26c/0xbe0 kernel/exit.c:795\n do_group_exit+0x60/0xe8 kernel/exit.c:925\n __do_sys_exit_group kernel/exit.c:936 [inline]\n __se_sys_exit_group kernel/exit.c:934 [inline]\n __wake_up_parent+0x0/0x40 kernel/exit.c:934\n __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline]\n invoke_syscall arch/arm64/kernel/syscall.c:52 [inline]\n el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142\n do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206\n el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636\n el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654\n el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581\n\nThe root cause of this issue is in error path of f2fs_start_discard_thread(),\nit missed to invalidate dcc->f2fs_issue_discard, later kthread_stop() may\naccess invalid pointer."
    }
  ],
  "lastModified": "2026-06-17T05:23:52.840",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}