linux-cve-announce - CVE-2025-39707: drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm

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Message-ID: <2025090549-CVE-2025-39707-c905@gregkh>
Date: Fri,  5 Sep 2025 19:21:20 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39707: drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm_capabilities

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

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

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

drm/amdgpu: check if hubbub is NULL in debugfs/amdgpu_dm_capabilities

HUBBUB structure is not initialized on DCE hardware, so check if it is NULL
to avoid null dereference while accessing amdgpu_dm_capabilities file in
debugfs.

The Linux kernel CVE team has assigned CVE-2025-39707 to this issue.


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

	Fixed in 6.12.44 with commit 83cfdc2b018cd9c0f927b781d4e07c0d4a911fac
	Fixed in 6.16.4 with commit 98e92fceb9507901e3e8b550e93b843306abd354
	Fixed in 6.17-rc1 with commit b4a69f7f29c8a459ad6b4d8a8b72450f1d9fd288

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-2025-39707
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_debugfs.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/83cfdc2b018cd9c0f927b781d4e07c0d4a911fac
	https://git.kernel.org/stable/c/98e92fceb9507901e3e8b550e93b843306abd354
	https://git.kernel.org/stable/c/b4a69f7f29c8a459ad6b4d8a8b72450f1d9fd288