CVE-2025-71079
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write
A deadlock can occur between nfc_unregister_device() and rfkill_fop_write() due to lock ordering inversion between device_lock and rfkill_global_mutex.
The problematic lock order is:
This creates a classic ABBA deadlock scenario.
Fix this by moving rfkill_unregister() and rfkill_destroy() outside the device_lock critical section. Store the rfkill pointer in a local variable before releasing the lock, then call rfkill_unregister() after releasing device_lock.
This change is safe because rfkill_fop_write() holds rfkill_global_mutex while calling the rfkill callbacks, and rfkill_unregister() also acquires rfkill_global_mutex before cleanup.
Leer descripción completaMostrar menos
Therefore, rfkill_unregister() will wait for any ongoing callback to complete before proceeding, and device_del() is only called after rfkill_unregister() returns, preventing any use-after-free.
The similar lock ordering in nfc_register_device() (device_lock -> rfkill_global_mutex via rfkill_register) is safe because during registration the device is not yet in rfkill_list, so no concurrent rfkill operations can occur on this device.
Detalles técnicos trazas, registros y código del informe original
Thread A (rfkill_fop_write):
rfkill_fop_write()
mutex_lock(&rfkill_global_mutex)
rfkill_set_block()
nfc_rfkill_set_block()
nfc_dev_down()
device_lock(&dev->dev) <- waits for device_lock
Thread B (nfc_unregister_device):
nfc_unregister_device()
device_lock(&dev->dev)
rfkill_unregister()
mutex_lock(&rfkill_global_mutex) <- waits for rfkill_global_mutexCVSS
- 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: 0.10%
- Percentil entre todas las CVEs puntuadas: 1
- Fecha de la puntuación: 4/10/2026
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-667
Referencias
- https://git.kernel.org/stable/c/1ab526d97a57e44d26fadcc0e9adeb9c0c0182f5
- https://git.kernel.org/stable/c/2e0831e9fc46a06daa6d4d8d57a2738e343130c3
- https://git.kernel.org/stable/c/6b93c8ab6f6cda8818983a4ae3fcf84b023037b4
- https://git.kernel.org/stable/c/8fc4632fb508432895430cd02b38086bdd649083
- https://git.kernel.org/stable/c/e02a1c33f10a0ed3aba855ab8ae2b6c4c5be8012
- https://git.kernel.org/stable/c/ee41f4f3ccf8cd6ba3732e867abbec7e6d8d12e5
- https://git.kernel.org/stable/c/f3a8a7c1aa278f2378b2f3a10500c6674dffdfda
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
JSON original (NVD)
Mostrar
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: nfc: fix deadlock between nfc_unregister_device and rfkill_fop_write\n\nA deadlock can occur between nfc_unregister_device() and rfkill_fop_write()\ndue to lock ordering inversion between device_lock and rfkill_global_mutex.\n\nThe problematic lock order is:\n\nThread A (rfkill_fop_write):\n rfkill_fop_write()\n mutex_lock(&rfkill_global_mutex)\n rfkill_set_block()\n nfc_rfkill_set_block()\n nfc_dev_down()\n device_lock(&dev->dev) <- waits for device_lock\n\nThread B (nfc_unregister_device):\n nfc_unregister_device()\n device_lock(&dev->dev)\n rfkill_unregister()\n mutex_lock(&rfkill_global_mutex) <- waits for rfkill_global_mutex\n\nThis creates a classic ABBA deadlock scenario.\n\nFix this by moving rfkill_unregister() and rfkill_destroy() outside the\ndevice_lock critical section. Store the rfkill pointer in a local variable\nbefore releasing the lock, then call rfkill_unregister() after releasing\ndevice_lock.\n\nThis change is safe because rfkill_fop_write() holds rfkill_global_mutex\nwhile calling the rfkill callbacks, and rfkill_unregister() also acquires\nrfkill_global_mutex before cleanup. Therefore, rfkill_unregister() will\nwait for any ongoing callback to complete before proceeding, and\ndevice_del() is only called after rfkill_unregister() returns, preventing\nany use-after-free.\n\nThe similar lock ordering in nfc_register_device() (device_lock ->\nrfkill_global_mutex via rfkill_register) is safe because during\nregistration the device is not yet in rfkill_list, so no concurrent\nrfkill operations can occur on this device."
},
{
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"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: nfc: corrige interbloqueo entre nfc_unregister_device y rfkill_fop_write\n\nPuede ocurrir un interbloqueo entre nfc_unregister_device() y rfkill_fop_write() debido a la inversión del orden de bloqueo entre device_lock y rfkill_global_mutex.\n\nEl orden de bloqueo problemático es:\n\nHilo A (rfkill_fop_write):\n rfkill_fop_write()\n mutex_lock(&rfkill_global_mutex)\n rfkill_set_block()\n nfc_rfkill_set_block()\n nfc_dev_down()\n device_lock(&dev->dev) <- espera por device_lock\n\nHilo B (nfc_unregister_device):\n nfc_unregister_device()\n device_lock(&dev->dev)\n rfkill_unregister()\n mutex_lock(&rfkill_global_mutex) <- espera por rfkill_global_mutex\n\nEsto crea un escenario clásico de interbloqueo ABBA.\n\nSoluciona esto moviendo rfkill_unregister() y rfkill_destroy() fuera de la sección crítica de device_lock. Almacena el puntero rfkill en una variable local antes de liberar el bloqueo, luego llama a rfkill_unregister() después de liberar device_lock.\n\nEste cambio es seguro porque rfkill_fop_write() mantiene rfkill_global_mutex mientras llama a las retrollamadas de rfkill, y rfkill_unregister() también adquiere rfkill_global_mutex antes de la limpieza. Por lo tanto, rfkill_unregister() esperará a que cualquier retrollamada en curso se complete antes de continuar, y device_del() solo se llama después de que rfkill_unregister() retorna, previniendo cualquier uso después de liberación.\n\nEl orden de bloqueo similar en nfc_register_device() (device_lock -> rfkill_global_mutex a través de rfkill_register) es seguro porque durante el registro el dispositivo aún no está en rfkill_list, por lo que no pueden ocurrir operaciones rfkill concurrentes en este dispositivo."
}
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"lastModified": "2026-07-14T13:18:01.890",
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