CVE-2022-50620 (GCVE-0-2022-50620)

Vulnerability from cvelistv5 – Published: 2025-12-08 01:16 – Updated: 2025-12-08 01:16
VLAI?
Title
f2fs: fix to invalidate dcc->f2fs_issue_discard in error path
Summary
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: __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 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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4d67490498acb4ffcef5ba7bc44990d46e66a44c , < 865bb7b5a7deeb0e5afbd82381d52d38825dc64d (git)
Affected: 4d67490498acb4ffcef5ba7bc44990d46e66a44c , < a3e517a6ba695d683ee63615e1ea6e6b4c7d2732 (git)
Affected: 4d67490498acb4ffcef5ba7bc44990d46e66a44c , < ae6c960a82c52c3bda5adc82d90643d6c12d308e (git)
Affected: 4d67490498acb4ffcef5ba7bc44990d46e66a44c , < 91586ce0d39a05f88795aa8814fb99b1387236b3 (git)
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    Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 5.15.86 , ≤ 5.15.* (semver)
Unaffected: 6.0.16 , ≤ 6.0.* (semver)
Unaffected: 6.1.2 , ≤ 6.1.* (semver)
Unaffected: 6.2 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/f2fs/segment.c"
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          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "status": "unaffected",
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              "versionType": "semver"
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              "version": "5.15.86",
              "versionType": "semver"
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              "lessThanOrEqual": "6.0.*",
              "status": "unaffected",
              "version": "6.0.16",
              "versionType": "semver"
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to invalidate dcc-\u003ef2fs_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-\u003ef2fs_issue_discard, later kthread_stop() may\naccess invalid pointer."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-08T01:16:33.771Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/865bb7b5a7deeb0e5afbd82381d52d38825dc64d"
        },
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          "url": "https://git.kernel.org/stable/c/a3e517a6ba695d683ee63615e1ea6e6b4c7d2732"
        },
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          "url": "https://git.kernel.org/stable/c/ae6c960a82c52c3bda5adc82d90643d6c12d308e"
        },
        {
          "url": "https://git.kernel.org/stable/c/91586ce0d39a05f88795aa8814fb99b1387236b3"
        }
      ],
      "title": "f2fs: fix to invalidate dcc-\u003ef2fs_issue_discard in error path",
      "x_generator": {
        "engine": "bippy-1.2.0"
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50620",
    "datePublished": "2025-12-08T01:16:33.771Z",
    "dateReserved": "2025-12-08T01:14:55.189Z",
    "dateUpdated": "2025-12-08T01:16:33.771Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50620\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-08T02:15:47.870\",\"lastModified\":\"2025-12-08T18:26:19.900\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nf2fs: fix to invalidate dcc-\u003ef2fs_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-\u003ef2fs_issue_discard, later kthread_stop() may\\naccess invalid pointer.\"}],\"metrics\":{},\"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\"}]}}"
  }
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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