linux-cve-announce - CVE-2025-38156: wifi: mt76: mt7996: Fix null-ptr-deref in mt7996_mmio_wed

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Message-ID: <2025070338-CVE-2025-38156-d23e@gregkh>
Date: Thu,  3 Jul 2025 10:36:12 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38156: wifi: mt76: mt7996: Fix null-ptr-deref in mt7996_mmio_wed_init()

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

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

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

wifi: mt76: mt7996: Fix null-ptr-deref in mt7996_mmio_wed_init()

devm_ioremap() returns NULL on error. Currently, mt7996_mmio_wed_init()
does not check for this case, which results in a NULL pointer
dereference.

Prevent null pointer dereference in mt7996_mmio_wed_init()

The Linux kernel CVE team has assigned CVE-2025-38156 to this issue.


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

	Issue introduced in 6.8 with commit 83eafc9251d6d30574b629ac637c56d168fcbdd9 and fixed in 6.12.34 with commit 1072fc0ca1f8d0d5397d24853386876f937b8e63
	Issue introduced in 6.8 with commit 83eafc9251d6d30574b629ac637c56d168fcbdd9 and fixed in 6.15.3 with commit af861c6dea2ef06845a5c7672999a06c06099735
	Issue introduced in 6.8 with commit 83eafc9251d6d30574b629ac637c56d168fcbdd9 and fixed in 6.16-rc1 with commit 8f30e2b059757d8711a823e4c9c023db62a1d171

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-2025-38156
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/mmio.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/1072fc0ca1f8d0d5397d24853386876f937b8e63
	https://git.kernel.org/stable/c/af861c6dea2ef06845a5c7672999a06c06099735
	https://git.kernel.org/stable/c/8f30e2b059757d8711a823e4c9c023db62a1d171