linux-cve-announce - CVE-2026-23152: wifi: mac80211: correctly decode TTLM with default link map

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Message-ID: <2026021414-CVE-2026-23152-c2ae@gregkh>
Date: Sat, 14 Feb 2026 17:04:18 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23152: wifi: mac80211: correctly decode TTLM with default link map

From: Greg Kroah-Hartman <gregkh@...nel.org>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

wifi: mac80211: correctly decode TTLM with default link map

TID-To-Link Mapping (TTLM) elements do not contain any link mapping
presence indicator if a default mapping is used and parsing needs to be
skipped.

Note that access points should not explicitly report an advertised TTLM
with a default mapping as that is the implied mapping if the element is
not included, this is even the case when switching back to the default
mapping. However, mac80211 would incorrectly parse the frame and would
also read one byte beyond the end of the element.

The Linux kernel CVE team has assigned CVE-2026-23152 to this issue.


Affected and fixed versions
===========================

	Issue introduced in 6.7 with commit 702e80470a3359ce02b3f846f48f6db4ac7fd837 and fixed in 6.18.9 with commit aabc36857bd39da65fe2d047bfaf63a0a09917d4
	Issue introduced in 6.7 with commit 702e80470a3359ce02b3f846f48f6db4ac7fd837 and fixed in 6.19 with commit 1eab33aa63c993685dd341e03bd5b267dd7403fa

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2026-23152
will be updated if fixes are backported, please check that for the most
up to date information about this issue.


Affected files
==============

The file(s) affected by this issue are:
	net/mac80211/mlme.c


Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/aabc36857bd39da65fe2d047bfaf63a0a09917d4
	https://git.kernel.org/stable/c/1eab33aa63c993685dd341e03bd5b267dd7403fa