linux-cve-announce - CVE-2025-68196: drm/amd/display: Cache streams targeting link when performing LT automation

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Message-ID: <2025121636-CVE-2025-68196-5e6e@gregkh>
Date: Tue, 16 Dec 2025 14:43:57 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68196: drm/amd/display: Cache streams targeting link when performing LT automation

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

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

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

drm/amd/display: Cache streams targeting link when performing LT automation

[WHY]
Last LT automation update can cause crash by referencing current_state and
calling into dc_update_planes_and_stream which may clobber current_state.

[HOW]
Cache relevant stream pointers and iterate through them instead of relying
on the current_state.

The Linux kernel CVE team has assigned CVE-2025-68196 to this issue.


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

	Fixed in 6.17.8 with commit 9ecd238e8230e83a5c5436fd2261da4518f5c979
	Fixed in 6.18 with commit f5b69101f956f5b89605a13cb15f093a7906f2a1

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-2025-68196
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/dc/link/accessories/link_dp_cts.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/9ecd238e8230e83a5c5436fd2261da4518f5c979
	https://git.kernel.org/stable/c/f5b69101f956f5b89605a13cb15f093a7906f2a1