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CVE-2022-49827 (GCVE-0-2022-49827)

Vulnerability from cvelistv5 – Published: 2025-05-01 14:09 – Updated: 2026-05-11 19:07
VLAI
Title
drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker()
Summary
In the Linux kernel, the following vulnerability has been resolved: drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker() drm_vblank_init() call drmm_add_action_or_reset() with drm_vblank_init_release() as action. If __drmm_add_action() failed, will directly call drm_vblank_init_release() with the vblank whose worker is NULL. As the resule, a null-ptr-deref will happen in kthread_destroy_worker(). Add the NULL check before calling drm_vblank_destroy_worker(). BUG: null-ptr-deref KASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f] CPU: 5 PID: 961 Comm: modprobe Not tainted 6.0.0-11331-gd465bff130bf-dirty RIP: 0010:kthread_destroy_worker+0x25/0xb0 Call Trace: <TASK> drm_vblank_init_release+0x124/0x220 [drm] ? drm_crtc_vblank_restore+0x8b0/0x8b0 [drm] __drmm_add_action_or_reset+0x41/0x50 [drm] drm_vblank_init+0x282/0x310 [drm] vkms_init+0x35f/0x1000 [vkms] ? 0xffffffffc4508000 ? lock_is_held_type+0xd7/0x130 ? __kmem_cache_alloc_node+0x1c2/0x2b0 ? lock_is_held_type+0xd7/0x130 ? 0xffffffffc4508000 do_one_initcall+0xd0/0x4f0 ... do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 5e6c2b4f916157e8f10d093d43e88b2a250d1774 , < 1d160dfb3fdf11ba9447e862c548447f91f4e74a (git)
Affected: 5e6c2b4f916157e8f10d093d43e88b2a250d1774 , < e884a6c2d49a6c12761e5bed851e9fe93bd923a1 (git)
Affected: 5e6c2b4f916157e8f10d093d43e88b2a250d1774 , < 3acd2016421b2e628acad65495d15493bf7a3bc3 (git)
Affected: 5e6c2b4f916157e8f10d093d43e88b2a250d1774 , < 4979524f5a2a8210e87fde2f642b0dc060860821 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.156 , ≤ 5.10.* (semver)
Unaffected: 5.15.80 , ≤ 5.15.* (semver)
Unaffected: 6.0.10 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm: Fix potential null-ptr-deref in drm_vblank_destroy_worker()\n\ndrm_vblank_init() call drmm_add_action_or_reset() with\ndrm_vblank_init_release() as action. If __drmm_add_action() failed, will\ndirectly call drm_vblank_init_release() with the vblank whose worker is\nNULL. As the resule, a null-ptr-deref will happen in\nkthread_destroy_worker(). Add the NULL check before calling\ndrm_vblank_destroy_worker().\n\nBUG: null-ptr-deref\nKASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]\nCPU: 5 PID: 961 Comm: modprobe Not tainted 6.0.0-11331-gd465bff130bf-dirty\nRIP: 0010:kthread_destroy_worker+0x25/0xb0\n  Call Trace:\n    \u003cTASK\u003e\n    drm_vblank_init_release+0x124/0x220 [drm]\n    ? drm_crtc_vblank_restore+0x8b0/0x8b0 [drm]\n    __drmm_add_action_or_reset+0x41/0x50 [drm]\n    drm_vblank_init+0x282/0x310 [drm]\n    vkms_init+0x35f/0x1000 [vkms]\n    ? 0xffffffffc4508000\n    ? lock_is_held_type+0xd7/0x130\n    ? __kmem_cache_alloc_node+0x1c2/0x2b0\n    ? lock_is_held_type+0xd7/0x130\n    ? 0xffffffffc4508000\n    do_one_initcall+0xd0/0x4f0\n    ...\n    do_syscall_64+0x35/0x80\n    entry_SYSCALL_64_after_hwframe+0x46/0xb0"
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    "datePublished": "2025-05-01T14:09:46.805Z",
    "dateReserved": "2025-05-01T14:05:17.228Z",
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    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49827\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-05-01T15:16:06.150\",\"lastModified\":\"2026-06-17T05:19:14.493\",\"vulnStatus\":\"Analyzed\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ndrm: Fix potential null-ptr-deref in drm_vblank_destroy_worker()\\n\\ndrm_vblank_init() call drmm_add_action_or_reset() with\\ndrm_vblank_init_release() as action. If __drmm_add_action() failed, will\\ndirectly call drm_vblank_init_release() with the vblank whose worker is\\nNULL. As the resule, a null-ptr-deref will happen in\\nkthread_destroy_worker(). Add the NULL check before calling\\ndrm_vblank_destroy_worker().\\n\\nBUG: null-ptr-deref\\nKASAN: null-ptr-deref in range [0x0000000000000068-0x000000000000006f]\\nCPU: 5 PID: 961 Comm: modprobe Not tainted 6.0.0-11331-gd465bff130bf-dirty\\nRIP: 0010:kthread_destroy_worker+0x25/0xb0\\n  Call Trace:\\n    \u003cTASK\u003e\\n    drm_vblank_init_release+0x124/0x220 [drm]\\n    ? drm_crtc_vblank_restore+0x8b0/0x8b0 [drm]\\n    __drmm_add_action_or_reset+0x41/0x50 [drm]\\n    drm_vblank_init+0x282/0x310 [drm]\\n    vkms_init+0x35f/0x1000 [vkms]\\n    ? 0xffffffffc4508000\\n    ? lock_is_held_type+0xd7/0x130\\n    ? __kmem_cache_alloc_node+0x1c2/0x2b0\\n    ? lock_is_held_type+0xd7/0x130\\n    ? 0xffffffffc4508000\\n    do_one_initcall+0xd0/0x4f0\\n    ...\\n    do_syscall_64+0x35/0x80\\n    entry_SYSCALL_64_after_hwframe+0x46/0xb0\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: drm: Se corrige la posible desreferencia PTR nula en la llamada drm_vblank_destroy_worker(). drm_vblank_init() llama a drmm_add_action_or_reset() con la acci\u00f3n drm_vblank_init_release(). Si __drmm_add_action() falla, se llamar\u00e1 directamente a drm_vblank_init_release() con el vblank cuyo trabajador sea NULL. Como resultado, se producir\u00e1 una desreferencia PTR nula en kthread_destroy_worker(). Se a\u00f1ade la comprobaci\u00f3n de valores NULL antes de llamar a drm_vblank_destroy_worker(). ERROR: null-ptr-deref KASAN: null-ptr-deref en el rango [0x0000000000000068-0x000000000000006f] CPU: 5 PID: 961 Comm: modprobe No contaminado 6.0.0-11331-gd465bff130bf-dirty RIP: 0010:kthread_destroy_worker+0x25/0xb0 Seguimiento de llamadas:   drm_vblank_init_release+0x124/0x220 [drm] ? drm_crtc_vblank_restore+0x8b0/0x8b0 [drm] __drmm_add_action_or_reset+0x41/0x50 [drm] drm_vblank_init+0x282/0x310 [drm] vkms_init+0x35f/0x1000 [vkms] ? 0xffffffffc4508000 ? lock_is_held_type+0xd7/0x130 ? __kmem_cache_alloc_node+0x1c2/0x2b0 ? lock_is_held_type+0xd7/0x130 ? 0xffffffffc4508000 do_one_initcall+0xd0/0x4f0 ... do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-21T18:44:01+00:00",
      "cve": "CVE-2022-49827",
      "id": "CVE-2022-49827",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "120",
      "product_status:known_affected": "166",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: drm: Fix potential null-ptr-deref in drm_vblank_destroy_worker()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-49827.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-31T01:28:46Z",
      "cve": "CVE-2022-49827",
      "id": "CVE-2022-49827",
      "initial_release_date": "2025-05-07T02:19:51Z",
      "product_status:known_affected": "339",
      "product_status:known_not_affected": "350",
      "product_status:recommended": "330",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-49827",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-49827.json",
      "version": "44"
    }
  }
}



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