linux-cve-announce - CVE-2025-40066: wifi: mt76: mt7996: Check phy before init msta_link in mt7996_mac_sta_add

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Message-ID: <2025102817-CVE-2025-40066-02f5@gregkh>
Date: Tue, 28 Oct 2025 12:48:43 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40066: wifi: mt76: mt7996: Check phy before init msta_link in mt7996_mac_sta_add_links()

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

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

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

wifi: mt76: mt7996: Check phy before init msta_link in mt7996_mac_sta_add_links()

In order to avoid a possible NULL pointer dereference in
mt7996_mac_sta_init_link routine, move the phy pointer check before
running mt7996_mac_sta_init_link() in mt7996_mac_sta_add_links routine.

The Linux kernel CVE team has assigned CVE-2025-40066 to this issue.


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

	Issue introduced in 6.15 with commit dd82a9e02c054052b5899872c1f32805428f6131 and fixed in 6.17.3 with commit 2e671536c1c3c7bcad95d408a4ab42e2e54d1882
	Issue introduced in 6.15 with commit dd82a9e02c054052b5899872c1f32805428f6131 and fixed in 6.18-rc1 with commit fe5fffadc6c77c56f122cf1042dc830f59e904bf

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-2025-40066
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


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/2e671536c1c3c7bcad95d408a4ab42e2e54d1882
	https://git.kernel.org/stable/c/fe5fffadc6c77c56f122cf1042dc830f59e904bf