linux-cve-announce - CVE-2025-38254: drm/amd/display: Add sanity checks for drm_edid

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Message-ID: <2025070935-CVE-2025-38254-7416@gregkh>
Date: Wed,  9 Jul 2025 12:42:46 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38254: drm/amd/display: Add sanity checks for drm_edid_raw()

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

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

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

drm/amd/display: Add sanity checks for drm_edid_raw()

When EDID is retrieved via drm_edid_raw(), it doesn't guarantee to
return proper EDID bytes the caller wants: it may be either NULL (that
leads to an Oops) or with too long bytes over the fixed size raw_edid
array (that may lead to memory corruption).  The latter was reported
actually when connected with a bad adapter.

Add sanity checks for drm_edid_raw() to address the above corner
cases, and return EDID_BAD_INPUT accordingly.

(cherry picked from commit 648d3f4d209725d51900d6a3ed46b7b600140cdf)

The Linux kernel CVE team has assigned CVE-2025-38254 to this issue.


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

	Issue introduced in 6.13 with commit 48edb2a4256eedf6c92eecf2bc7744e6ecb44b5e and fixed in 6.15.5 with commit 4b63507d7cd243574753c6b91f68516d9103f1de
	Issue introduced in 6.13 with commit 48edb2a4256eedf6c92eecf2bc7744e6ecb44b5e and fixed in 6.16-rc4 with commit 6847b3b6e84ef37451c074e6a8db3fbd250c8dbf

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-2025-38254
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_helpers.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/4b63507d7cd243574753c6b91f68516d9103f1de
	https://git.kernel.org/stable/c/6847b3b6e84ef37451c074e6a8db3fbd250c8dbf