linux-cve-announce - CVE-2025-40162: ASoC: amd/sdw_utils: avoid NULL deref when devm

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Message-ID: <2025111227-CVE-2025-40162-210b@gregkh>
Date: Wed, 12 Nov 2025 19:26:28 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40162: ASoC: amd/sdw_utils: avoid NULL deref when devm_kasprintf() fails

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

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

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

ASoC: amd/sdw_utils: avoid NULL deref when devm_kasprintf() fails

devm_kasprintf() may return NULL on memory allocation failure,
but the debug message prints cpus->dai_name before checking it.
Move the dev_dbg() call after the NULL check to prevent potential
NULL pointer dereference.

The Linux kernel CVE team has assigned CVE-2025-40162 to this issue.


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

	Issue introduced in 6.12 with commit cb8ea62e6402067ba092d4c1d66a9440513a572b and fixed in 6.12.55 with commit 095d692e5997ece300c89f10d903d5230090e6a0
	Issue introduced in 6.12 with commit cb8ea62e6402067ba092d4c1d66a9440513a572b and fixed in 6.17.5 with commit a1cccbd19676fc36854535a7118ba2c27d0b84b3
	Issue introduced in 6.12 with commit cb8ea62e6402067ba092d4c1d66a9440513a572b and fixed in 6.18-rc2 with commit 5726b68473f7153a7f6294185e5998b7e2a230a2

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-2025-40162
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:
	sound/soc/amd/acp/acp-sdw-sof-mach.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/095d692e5997ece300c89f10d903d5230090e6a0
	https://git.kernel.org/stable/c/a1cccbd19676fc36854535a7118ba2c27d0b84b3
	https://git.kernel.org/stable/c/5726b68473f7153a7f6294185e5998b7e2a230a2