CVE-2022-49827
Estado: AnalizadaMedia (5.5)—
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().
Detalles técnicos trazas, registros y código del informe original
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+0x46/0xb0CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.21%
- Percentil entre todas las CVEs puntuadas: 11
- Fecha de la puntuación: 6/10/2026
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)
CWE
- CWE-476
Referencias
JSON original (NVD)
Mostrar
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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 <TASK>\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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"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 acción drm_vblank_init_release(). Si __drmm_add_action() falla, se llamará directamente a drm_vblank_init_release() con el vblank cuyo trabajador sea NULL. Como resultado, se producirá una desreferencia PTR nula en kthread_destroy_worker(). Se añade la comprobación 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 "
}
],
"lastModified": "2026-06-17T05:19:14.493",
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