linux-cve-announce - CVE-2025-38343: wifi: mt76: mt7996: drop fragments with multicast or broadcast RA

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Message-ID: <2025071035-CVE-2025-38343-9a3b@gregkh>
Date: Thu, 10 Jul 2025 10:15:51 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38343: wifi: mt76: mt7996: drop fragments with multicast or broadcast RA

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

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

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

wifi: mt76: mt7996: drop fragments with multicast or broadcast RA

IEEE 802.11 fragmentation can only be applied to unicast frames.
Therefore, drop fragments with multicast or broadcast RA. This patch
addresses vulnerabilities such as CVE-2020-26145.

The Linux kernel CVE team has assigned CVE-2025-38343 to this issue.


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

	Fixed in 6.6.95 with commit 24900688ee47071aa6a61e78473999b5b80f0423
	Fixed in 6.12.35 with commit d4b93f9c2f666011dcf810050ef60a6b8d06f186
	Fixed in 6.15.4 with commit 5fd5b8132b5de08c99eea003f7715ff2e361b007
	Fixed in 6.16-rc1 with commit 80fda1cd7b0a1edd0849dc71403a070d0922118d

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-2025-38343
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:
	drivers/net/wireless/mediatek/mt76/mt7996/mac.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/24900688ee47071aa6a61e78473999b5b80f0423
	https://git.kernel.org/stable/c/d4b93f9c2f666011dcf810050ef60a6b8d06f186
	https://git.kernel.org/stable/c/5fd5b8132b5de08c99eea003f7715ff2e361b007
	https://git.kernel.org/stable/c/80fda1cd7b0a1edd0849dc71403a070d0922118d