linux-cve-announce - CVE-2025-39919: wifi: mt76: mt7996: add missing check for rx wcid entries

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Message-ID: <2025100119-CVE-2025-39919-b28a@gregkh>
Date: Wed,  1 Oct 2025 09:55:21 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39919: wifi: mt76: mt7996: add missing check for rx wcid entries

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

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

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

wifi: mt76: mt7996: add missing check for rx wcid entries

Non-station wcid entries must not be passed to the rx functions.
In case of the global wcid entry, it could even lead to corruption in the wcid
array due to pointer being casted to struct mt7996_sta_link using container_of.

The Linux kernel CVE team has assigned CVE-2025-39919 to this issue.


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

	Issue introduced in 6.15 with commit 7464b12b7d92b9641d4664735b9f3c3f0b6173d9 and fixed in 6.16.6 with commit 69dcc19048fcdc3fb166fd25b805470ee8fc0eb1
	Issue introduced in 6.15 with commit 7464b12b7d92b9641d4664735b9f3c3f0b6173d9 and fixed in 6.17 with commit 4a522b01e368eec58d182ecc47d24f49a39e440d

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-2025-39919
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/69dcc19048fcdc3fb166fd25b805470ee8fc0eb1
	https://git.kernel.org/stable/c/4a522b01e368eec58d182ecc47d24f49a39e440d