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CVE-2026-68402

wifi: cfg80211: bound element ID read when checking non-inheritance

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.265, 5.15.216, 6.1.183, 6.6.148, 6.12.101, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: no
  • Technical impact: partial

Summary

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: no · Technical impact: partial

  3. Record last updated

Affected versions

  • Linux 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 Linux

    5.2

  • KernelLinux

    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

References 8

git.kernel.org