linux-cve-announce - CVE-2025-40354: drm/amd/display: increase max link count and fix link->enc NULL pointer access

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025121637-CVE-2025-40354-b9bd@gregkh>
Date: Tue, 16 Dec 2025 14:30:41 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40354: drm/amd/display: increase max link count and fix link->enc NULL pointer access

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

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

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

drm/amd/display: increase max link count and fix link->enc NULL pointer access

[why]
1.) dc->links[MAX_LINKS] array size smaller than actual requested.
max_connector + max_dpia + 4 virtual = 14.
increase from 12 to 14.

2.) hw_init() access null LINK_ENC for dpia non display_endpoint.

(cherry picked from commit d7f5a61e1b04ed87b008c8d327649d184dc5bb45)

The Linux kernel CVE team has assigned CVE-2025-40354 to this issue.


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

	Fixed in 6.12.56 with commit f28092be4e12b7df9e4f415d25bf0d767bc2d9ed
	Fixed in 6.17.6 with commit a3fc0d36cfb927f8986b83bf5fba47dbedad3c63
	Fixed in 6.18 with commit bec947cbe9a65783adb475a5fb47980d7b4f4796

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-2025-40354
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/hwss/dcn401/dcn401_hwseq.c
	drivers/gpu/drm/amd/display/dc/inc/hw/hw_shared.h


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/f28092be4e12b7df9e4f415d25bf0d767bc2d9ed
	https://git.kernel.org/stable/c/a3fc0d36cfb927f8986b83bf5fba47dbedad3c63
	https://git.kernel.org/stable/c/bec947cbe9a65783adb475a5fb47980d7b4f4796