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CVE-2026-23372

Estado: AnalizadaAlta (7.8)—

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

nfc: rawsock: cancel tx_work before socket teardown

In rawsock_release(), cancel any pending tx_work and purge the write queue before orphaning the socket. rawsock_tx_work runs on the system workqueue and calls nfc_data_exchange which dereferences the NCI device. Without synchronization, tx_work can race with socket and device teardown when a process is killed (e.g. by SIGKILL), leading to use-after-free or leaked references.

Set SEND_SHUTDOWN first so that if tx_work is already running it will see the flag and skip transmitting, then use cancel_work_sync to wait for any in-progress execution to finish, and finally purge any remaining queued skbs.

CVSS

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).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad de use-after-free en liberación de socket NFC con privilegios locales (PR:L). Impacto: DoS por corrupción de memoria y potencial manipulación de datos en intercambio NFC.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramRestrict File and Directory PermissionsRemote Data StorageFilter Network TrafficExecution PreventionEncrypt Sensitive Information

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnfc: rawsock: cancel tx_work before socket teardown\n\nIn rawsock_release(), cancel any pending tx_work and purge the write\nqueue before orphaning the socket.  rawsock_tx_work runs on the system\nworkqueue and calls nfc_data_exchange which dereferences the NCI\ndevice.  Without synchronization, tx_work can race with socket and\ndevice teardown when a process is killed (e.g. by SIGKILL), leading\nto use-after-free or leaked references.\n\nSet SEND_SHUTDOWN first so that if tx_work is already running it will\nsee the flag and skip transmitting, then use cancel_work_sync to wait\nfor any in-progress execution to finish, and finally purge any\nremaining queued skbs."
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      "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnfc: rawsock: cancelar tx_work antes del desmontaje del socket\n\nEn rawsock_release(), cancelar cualquier tx_work pendiente y purgar la cola de escritura antes de dejar huérfano el socket. rawsock_tx_work se ejecuta en la cola de trabajo del sistema y llama a nfc_data_exchange, que desreferencia el dispositivo NCI. Sin sincronización, tx_work puede competir con el desmontaje del socket y del dispositivo cuando un proceso es terminado (p. ej., por SIGKILL), lo que lleva a uso después de liberación o referencias filtradas.\n\nEstablecer SEND_SHUTDOWN primero para que si tx_work ya se está ejecutando, vea la bandera y omita la transmisión, luego usar cancel_work_sync para esperar a que finalice cualquier ejecución en curso, y finalmente purgar cualquier skbs en cola restante."
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