linux-cve-announce - CVE-2025-39675: drm/amd/display: Add null pointer check in mod_hdcp_hdcp1_create

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: <2025090544-CVE-2025-39675-bd21@gregkh>
Date: Fri,  5 Sep 2025 19:20:49 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39675: drm/amd/display: Add null pointer check in mod_hdcp_hdcp1_create_session()

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

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

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

drm/amd/display: Add null pointer check in mod_hdcp_hdcp1_create_session()

The function mod_hdcp_hdcp1_create_session() calls the function
get_first_active_display(), but does not check its return value.
The return value is a null pointer if the display list is empty.
This will lead to a null pointer dereference.

Add a null pointer check for get_first_active_display() and return
MOD_HDCP_STATUS_DISPLAY_NOT_FOUND if the function return null.

This is similar to the commit c3e9826a2202
("drm/amd/display: Add null pointer check for get_first_active_display()").

(cherry picked from commit 5e43eb3cd731649c4f8b9134f857be62a416c893)

The Linux kernel CVE team has assigned CVE-2025-39675 to this issue.


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

	Issue introduced in 5.8 with commit 2deade5ede56581722c0d7672f28b09548dc0fc4 and fixed in 5.15.190 with commit 2af45aadb7b5d3852c76e2d1e985289ada6f48bf
	Issue introduced in 5.8 with commit 2deade5ede56581722c0d7672f28b09548dc0fc4 and fixed in 6.1.149 with commit ee0373b20bb67b1f00a1b25ccd24c8ac996b6446
	Issue introduced in 5.8 with commit 2deade5ede56581722c0d7672f28b09548dc0fc4 and fixed in 6.6.103 with commit 857b8387a9777e42b36e0400be99b54c251eaf9a
	Issue introduced in 5.8 with commit 2deade5ede56581722c0d7672f28b09548dc0fc4 and fixed in 6.12.44 with commit 97fc94c5fd3c6ac5a13e457d38ee247737b8c4bd
	Issue introduced in 5.8 with commit 2deade5ede56581722c0d7672f28b09548dc0fc4 and fixed in 6.16.4 with commit 2ee86b764c54e0d6a5464fb023b630fdf20869cd
	Issue introduced in 5.8 with commit 2deade5ede56581722c0d7672f28b09548dc0fc4 and fixed in 6.17-rc3 with commit 7a2ca2ea64b1b63c8baa94a8f5deb70b2248d119

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-2025-39675
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/modules/hdcp/hdcp_psp.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/2af45aadb7b5d3852c76e2d1e985289ada6f48bf
	https://git.kernel.org/stable/c/ee0373b20bb67b1f00a1b25ccd24c8ac996b6446
	https://git.kernel.org/stable/c/857b8387a9777e42b36e0400be99b54c251eaf9a
	https://git.kernel.org/stable/c/97fc94c5fd3c6ac5a13e457d38ee247737b8c4bd
	https://git.kernel.org/stable/c/2ee86b764c54e0d6a5464fb023b630fdf20869cd
	https://git.kernel.org/stable/c/7a2ca2ea64b1b63c8baa94a8f5deb70b2248d119