CVE-2022-49292

Estado: ModificadaAlta (7.8)—

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

ALSA: oss: Fix PCM OSS buffer allocation overflow

We've got syzbot reports hitting INT_MAX overflow at vmalloc() allocation that is called from snd_pcm_plug_alloc(). Although we apply the restrictions to input parameters, it's based only on the hw_params of the underlying PCM device. Since the PCM OSS layer allocates a temporary buffer for the data conversion, the size may become unexpectedly large when more channels or higher rates is given; in the reported case, it went over INT_MAX, hence it hits WARN_ON().

This patch is an attempt to avoid such an overflow and an allocation for too large buffers. First off, it adds the limit of 1MB as the upper bound for period bytes.

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This must be large enough for all use cases, and we really don't want to handle a larger temporary buffer than this size. The size check is performed at two places, where the original period bytes is calculated and where the plugin buffer size is calculated.

In addition, the driver uses array_size() and array3_size() for multiplications to catch overflows for the converted period size and buffer bytes.

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: 0.28%
Percentil entre todas las CVEs puntuadas: 19
Fecha de la puntuación: 5/10/2026

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 Interpreterexecution70 %

Vulnerabilidad de desbordamiento de búfer (CWE-787) en kernel Linux que requiere acceso local con privilegios bajos. El vector AV:L/PR:L permite la explotación local, típico de T1068. La ejecución de código es el impacto derivado del overflow 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-787

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: oss: Fix PCM OSS buffer allocation overflow\n\nWe've got syzbot reports hitting INT_MAX overflow at vmalloc()\nallocation that is called from snd_pcm_plug_alloc().  Although we\napply the restrictions to input parameters, it's based only on the\nhw_params of the underlying PCM device.  Since the PCM OSS layer\nallocates a temporary buffer for the data conversion, the size may\nbecome unexpectedly large when more channels or higher rates is given;\nin the reported case, it went over INT_MAX, hence it hits WARN_ON().\n\nThis patch is an attempt to avoid such an overflow and an allocation\nfor too large buffers.  First off, it adds the limit of 1MB as the\nupper bound for period bytes.  This must be large enough for all use\ncases, and we really don't want to handle a larger temporary buffer\nthan this size.  The size check is performed at two places, where the\noriginal period bytes is calculated and where the plugin buffer size\nis calculated.\n\nIn addition, the driver uses array_size() and array3_size() for\nmultiplications to catch overflows for the converted period size and\nbuffer bytes."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: ALSA: oss: Fix PCM OSS buffer assignment overflow Tenemos informes de syzbot que alcanzan un desbordamiento de INT_MAX en la asignación de vmalloc() que se llama desde snd_pcm_plug_alloc(). Aunque aplicamos las restricciones a los parámetros de entrada, se basa solo en hw_params del dispositivo PCM subyacente. Dado que la capa PCM OSS asigna un búfer temporal para la conversión de datos, el tamaño puede volverse inesperadamente grande cuando se dan más canales o velocidades más altas; en el caso informado, superó INT_MAX, por lo tanto, alcanza WARN_ON(). Este parche es un intento de evitar dicho desbordamiento y una asignación para búferes demasiado grandes. En primer lugar, agrega el límite de 1 MB como límite superior para bytes de período. Esto debe ser lo suficientemente grande para todos los casos de uso, y realmente no queremos manejar un búfer temporal más grande que este tamaño. La comprobación del tamaño se realiza en dos lugares: donde se calculan los bytes del período original y donde se calcula el tamaño del búfer del complemento. Además, el controlador utiliza array_size() y array3_size() para las multiplicaciones con el fin de detectar desbordamientos en el tamaño del período convertido y los bytes del búfer."
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