CVE-2026-68402

Status: UPDATED  |  Advisory ID: CVE-2026-68402

Key Details

Affected Products, Subsystems & Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References