linux-cve-announce - CVE-2025-68181: drm/radeon: Remove calls to drm_put

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Message-ID: <2025121631-CVE-2025-68181-57dd@gregkh>
Date: Tue, 16 Dec 2025 14:43:42 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68181: drm/radeon: Remove calls to drm_put_dev()

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

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

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

drm/radeon: Remove calls to drm_put_dev()

Since the allocation of the drivers main structure was changed to
devm_drm_dev_alloc() drm_put_dev()'ing to trigger it to be free'd
should be done by devres.

However, drm_put_dev() is still in the probe error and device remove
paths. When the driver fails to probe warnings like the following are
shown because devres is trying to drm_put_dev() after the driver
already did it.

[    5.642230] radeon 0000:01:05.0: probe with driver radeon failed with error -22
[    5.649605] ------------[ cut here ]------------
[    5.649607] refcount_t: underflow; use-after-free.
[    5.649620] WARNING: CPU: 0 PID: 357 at lib/refcount.c:28 refcount_warn_saturate+0xbe/0x110

(cherry picked from commit 3eb8c0b4c091da0a623ade0d3ee7aa4a93df1ea4)

The Linux kernel CVE team has assigned CVE-2025-68181 to this issue.


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

	Issue introduced in 6.12 with commit a9ed2f052c5c14e4be58c5ec8794dffc87588123 and fixed in 6.12.58 with commit 2fa41445d8c98f2a65503c373796466496edc0e7
	Issue introduced in 6.12 with commit a9ed2f052c5c14e4be58c5ec8794dffc87588123 and fixed in 6.17.8 with commit ec18f6b2c743cc471b2539ddb5caed20a012e640
	Issue introduced in 6.12 with commit a9ed2f052c5c14e4be58c5ec8794dffc87588123 and fixed in 6.18 with commit 745bae76acdd71709773c129a69deca01036250b

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-2025-68181
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/radeon/radeon_drv.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/2fa41445d8c98f2a65503c373796466496edc0e7
	https://git.kernel.org/stable/c/ec18f6b2c743cc471b2539ddb5caed20a012e640
	https://git.kernel.org/stable/c/745bae76acdd71709773c129a69deca01036250b