linux-cve-announce - CVE-2025-68738: wifi: mt76: mt7996: fix null pointer deref in mt7996_conf

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Message-ID: <2025122414-CVE-2025-68738-79ca@gregkh>
Date: Wed, 24 Dec 2025 13:10:14 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68738: wifi: mt76: mt7996: fix null pointer deref in mt7996_conf_tx()

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

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

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

wifi: mt76: mt7996: fix null pointer deref in mt7996_conf_tx()

If a link does not have an assigned channel yet, mt7996_vif_link returns
NULL. We still need to store the updated queue settings in that case, and
apply them later.
Move the location of the queue params to within struct mt7996_vif_link.

The Linux kernel CVE team has assigned CVE-2025-68738 to this issue.


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

	Issue introduced in 6.14 with commit c0df2f0caa8dde0d50f36649ee28a54c5079281b and fixed in 6.17.13 with commit 96841352aaba7723c20afb3a5356746810ef8198
	Issue introduced in 6.14 with commit c0df2f0caa8dde0d50f36649ee28a54c5079281b and fixed in 6.18.2 with commit b8f34c1c5c4f5130c20e3253c95ba1d844d402b9
	Issue introduced in 6.14 with commit c0df2f0caa8dde0d50f36649ee28a54c5079281b and fixed in 6.19-rc1 with commit 79277f8ad15ec5f255ed0e1427c7a8a3e94e7f52

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-2025-68738
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/main.c
	drivers/net/wireless/mediatek/mt76/mt7996/mcu.c
	drivers/net/wireless/mediatek/mt76/mt7996/mt7996.h


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/96841352aaba7723c20afb3a5356746810ef8198
	https://git.kernel.org/stable/c/b8f34c1c5c4f5130c20e3253c95ba1d844d402b9
	https://git.kernel.org/stable/c/79277f8ad15ec5f255ed0e1427c7a8a3e94e7f52