CVE-2022-49291

Estado: AnalizadaAlta (7.8)—

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

ALSA: pcm: Fix races among concurrent hw_params and hw_free calls

Currently we have neither proper check nor protection against the concurrent calls of PCM hw_params and hw_free ioctls, which may result in a UAF. Since the existing PCM stream lock can't be used for protecting the whole ioctl operations, we need a new mutex to protect those racy calls.

This patch introduced a new mutex, runtime->buffer_mutex, and applies it to both hw_params and hw_free ioctl code paths. Along with it, the both functions are slightly modified (the mmap_count check is moved into the state-check block) for code simplicity.

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Puntuación base: 7.8

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.30%
Percentil entre todas las CVEs puntuadas: 21
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).

🎯 Técnicas ATT&CK

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

ExplotaciónT1068 Exploitation for Privilege Escalationprivilege escalation85 %
Impacto principalT1059 Command and Scripting Interpreterexecution75 %

CWE-416 (Use-After-Free) en kernel de Linux con acceso local (AV:L, PR:L) sin interacción del usuario permite escalada de privilegios. La ejecución de código resulta de la corrupción de memoria.

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

Execution Prevention Threat Intelligence Program Restrict Web-Based Content Privileged Account Management Limit Software Installation Behavior Prevention on Endpoint

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-416

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: pcm: Fix races among concurrent hw_params and hw_free calls\n\nCurrently we have neither proper check nor protection against the\nconcurrent calls of PCM hw_params and hw_free ioctls, which may result\nin a UAF.  Since the existing PCM stream lock can't be used for\nprotecting the whole ioctl operations, we need a new mutex to protect\nthose racy calls.\n\nThis patch introduced a new mutex, runtime->buffer_mutex, and applies\nit to both hw_params and hw_free ioctl code paths.  Along with it, the\nboth functions are slightly modified (the mmap_count check is moved\ninto the state-check block) for code simplicity."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: pcm: Arregla ejecuciones entre llamadas hw_params y hw_free concurrentes Actualmente no tenemos ni la comprobación adecuada ni la protección contra las llamadas concurrentes de las ioctl hw_params y hw_free de PCM, lo que puede resultar en un UAF. Dado que el bloqueo de flujo de PCM existente no se puede utilizar para proteger todas las operaciones ioctl, necesitamos un nuevo mutex para proteger esas llamadas con ejecuciones. Este parche introdujo un nuevo mutex, runtime-&gt;buffer_mutex, y lo aplica a las rutas de código de ioctl hw_params y hw_free. Junto con él, ambas funciones se modifican ligeramente (la comprobación mmap_count se mueve al bloque state-check) para simplificar el código."
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