linux-cve-announce - CVE-2025-21995: drm/sched: Fix fence reference count leak

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Message-ID: <2025040346-CVE-2025-21995-64c3@gregkh>
Date: Thu,  3 Apr 2025 08:17:47 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21995: drm/sched: Fix fence reference count leak

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

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

drm/sched: Fix fence reference count leak

The last_scheduled fence leaks when an entity is being killed and adding
the cleanup callback fails.

Decrement the reference count of prev when dma_fence_add_callback()
fails, ensuring proper balance.

[phasta: add git tag info for stable kernel]

The Linux kernel CVE team has assigned CVE-2025-21995 to this issue.


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

	Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.6.85 with commit c76bd3c99293834de7d1dca5de536616d5655e38
	Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.12.21 with commit 1135a9431160575466ea9ac37ebd756ecbe35fff
	Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.13.9 with commit 35399c84dcedd6d31448fb9e1336ef52673f2882
	Issue introduced in 6.2 with commit 2fdb8a8f07c2f1353770a324fd19b8114e4329ac and fixed in 6.14 with commit a952f1ab696873be124e31ce5ef964d36bce817f

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-2025-21995
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/scheduler/sched_entity.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/c76bd3c99293834de7d1dca5de536616d5655e38
	https://git.kernel.org/stable/c/1135a9431160575466ea9ac37ebd756ecbe35fff
	https://git.kernel.org/stable/c/35399c84dcedd6d31448fb9e1336ef52673f2882
	https://git.kernel.org/stable/c/a952f1ab696873be124e31ce5ef964d36bce817f