linux-cve-announce - CVE-2023-53498: drm/amd/display: Fix potential null dereference

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Message-ID: <2025100126-CVE-2023-53498-3f4e@gregkh>
Date: Wed,  1 Oct 2025 13:45:50 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53498: drm/amd/display: Fix potential null dereference

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

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

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

drm/amd/display: Fix potential null dereference

The adev->dm.dc pointer can be NULL and dereferenced in amdgpu_dm_fini()
without checking.

Add a NULL pointer check before calling dc_dmub_srv_destroy().

Found by Linux Verification Center (linuxtesting.org) with SVACE.

The Linux kernel CVE team has assigned CVE-2023-53498 to this issue.


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

	Issue introduced in 5.6 with commit 9a71c7d31734f74549ad2bcd652c403c71e7c8d1 and fixed in 5.15.111 with commit 4b1afffdd94093118b3cc235ef2b4d2520fb4950
	Issue introduced in 5.6 with commit 9a71c7d31734f74549ad2bcd652c403c71e7c8d1 and fixed in 6.1.28 with commit b75aaebac265e3f29863699d9a929fdfba13d0a4
	Issue introduced in 5.6 with commit 9a71c7d31734f74549ad2bcd652c403c71e7c8d1 and fixed in 6.2.15 with commit 281933f36a53fed1c2993a92cf1edfb424595474
	Issue introduced in 5.6 with commit 9a71c7d31734f74549ad2bcd652c403c71e7c8d1 and fixed in 6.3.2 with commit d4b749771fed3f99bbe8880eaab32a05ede0e5fa
	Issue introduced in 5.6 with commit 9a71c7d31734f74549ad2bcd652c403c71e7c8d1 and fixed in 6.4 with commit 52f1783ff4146344342422c1cd94fcb4ce39b6fe

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-2023-53498
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/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.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/4b1afffdd94093118b3cc235ef2b4d2520fb4950
	https://git.kernel.org/stable/c/b75aaebac265e3f29863699d9a929fdfba13d0a4
	https://git.kernel.org/stable/c/281933f36a53fed1c2993a92cf1edfb424595474
	https://git.kernel.org/stable/c/d4b749771fed3f99bbe8880eaab32a05ede0e5fa
	https://git.kernel.org/stable/c/52f1783ff4146344342422c1cd94fcb4ce39b6fe