---
id: CVE-2026-72262
title: 'ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get

  The ipc_control_data buffer is allocated as kzalloc(max_size), where
  max_size covers the entire struct …
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 <
    af4b437a463ac0482ba705434a44da06783778e6
  - >-
    Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 <
    1adde1941bba7b0d7104b86ed819d48d81cb0ad9
  - >-
    Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 <
    eaa67e139c9217099e2a7b717aeeb46c65de3494
  - >-
    Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 <
    121577383b5cf221e86581e0f2bcca4c66f17469
  - >-
    Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 <
    f4933e1d11b97b6a0951648b7c3e53850e1b33a9
  - >-
    Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 <
    fd46668d538993218eea19c6925c868ac0f2630c
  - Linux 5.18
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-16T18:45:34.306028Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T18:55:14.172Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-72262'
references:
  - url: 'https://git.kernel.org/stable/c/af4b437a463ac0482ba705434a44da06783778e6'
  - url: 'https://git.kernel.org/stable/c/1adde1941bba7b0d7104b86ed819d48d81cb0ad9'
  - url: 'https://git.kernel.org/stable/c/eaa67e139c9217099e2a7b717aeeb46c65de3494'
  - url: 'https://git.kernel.org/stable/c/121577383b5cf221e86581e0f2bcca4c66f17469'
  - url: 'https://git.kernel.org/stable/c/f4933e1d11b97b6a0951648b7c3e53850e1b33a9'
  - url: 'https://git.kernel.org/stable/c/fd46668d538993218eea19c6925c868ac0f2630c'
tags:
  - cve.org
epss: 0.00182
epssPercentile: 0.0729
ingestedAt: '2026-10-16T19:46:24.414Z'
---

## Overview

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

ASoC: SOF: ipc3-control: Fix heap overflow in bytes_ext put/get

The ipc_control_data buffer is allocated as kzalloc(max_size), where
max_size covers the entire struct sof_ipc_ctrl_data including its
flexible array payload. However, the bounds checks in bytes_ext_put
and _bytes_ext_get compared user data lengths against max_size
directly, ignoring that cdata->data sits at an offset of
sizeof(struct sof_ipc_ctrl_data) bytes into the allocation.

This allowed writing up to sizeof(struct sof_ipc_ctrl_data) bytes past
the end of the heap buffer from unprivileged userspace via the ALSA TLV
kcontrol interface, and similarly allowed over-reading adjacent heap
data on the get path.

Fix all bounds checks to subtract sizeof(*cdata) from max_size so they
reflect the actual space available at the cdata->data offset. Also fix
the error-path restore in bytes_ext_put which wrote to cdata->data
instead of cdata, causing the same overflow.

## Affected

- `Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 < af4b437a463ac0482ba705434a44da06783778e6`
- `Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 < 1adde1941bba7b0d7104b86ed819d48d81cb0ad9`
- `Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 < eaa67e139c9217099e2a7b717aeeb46c65de3494`
- `Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 < 121577383b5cf221e86581e0f2bcca4c66f17469`
- `Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 < f4933e1d11b97b6a0951648b7c3e53850e1b33a9`
- `Linux >= 67ec2a091630c28ea8d05db2bd7178a05b04b7e6 < fd46668d538993218eea19c6925c868ac0f2630c`
- `Linux 5.18`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.