CVE-2026-68402 is a vulnerability in Linux Kernel
Published on August 10, 2026
wifi: cfg80211: bound element ID read when checking non-inheritance
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.
Products Associated with CVE-2026-68402
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Affected Versions
Linux:- Version f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 and below 20c308d9a57722801961f816395bf825f7bde6bc is affected.
- Version f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 and below 84bd907361c56fbd5523eceb2682cb39da059bd5 is affected.
- Version f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 and below 11ac7a5e75f5132f1778e0c60981d30dc29fb869 is affected.
- Version f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 and below ddf2773bcc8e49a43c561f22ec1e7924215d7947 is affected.
- Version f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 and below cb8afea4655ff004fa7feee825d5c79783525383 is affected.
- Version 5.2 is affected.
- Before 5.2 is unaffected.
- Version 6.6.148, <= 6.6.* is unaffected.
- Version 6.12.101, <= 6.12.* is unaffected.
- Version 6.18.42, <= 6.18.* is unaffected.
- Version 7.1.6, <= 7.1.* is unaffected.
- Version 7.2-rc4, <= * is unaffected.