linux-cve-announce - CVE-2025-37763: drm/imagination: take paired job reference

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Message-ID: <2025050110-CVE-2025-37763-7fc5@gregkh>
Date: Thu,  1 May 2025 15:07:11 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37763: drm/imagination: take paired job reference

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

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

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

drm/imagination: take paired job reference

For paired jobs, have the fragment job take a reference on the
geometry job, so that the geometry job cannot be freed until
the fragment job has finished with it.

The geometry job structure is accessed when the fragment job is being
prepared by the GPU scheduler. Taking the reference prevents the
geometry job being freed until the fragment job no longer requires it.

Fixes a use after free bug detected by KASAN:

[  124.256386] BUG: KASAN: slab-use-after-free in pvr_queue_prepare_job+0x108/0x868 [powervr]
[  124.264893] Read of size 1 at addr ffff0000084cb960 by task kworker/u16:4/63

The Linux kernel CVE team has assigned CVE-2025-37763 to this issue.


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

	Issue introduced in 6.8 with commit eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde and fixed in 6.12.25 with commit c90b95e12eb88d23740e5ea2c43d71675d17ac8d
	Issue introduced in 6.8 with commit eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde and fixed in 6.14.4 with commit b5a6f97a78e2fc008fd6503b7040cb7e1120b873
	Issue introduced in 6.8 with commit eaf01ee5ba28b97f96a3d3eec4c5fbfb37ee4cde and fixed in 6.15-rc2 with commit 4ba2abe154ef68f9612eee9d6fbfe53a1736b064

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-2025-37763
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/imagination/pvr_job.c
	drivers/gpu/drm/imagination/pvr_queue.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/c90b95e12eb88d23740e5ea2c43d71675d17ac8d
	https://git.kernel.org/stable/c/b5a6f97a78e2fc008fd6503b7040cb7e1120b873
	https://git.kernel.org/stable/c/4ba2abe154ef68f9612eee9d6fbfe53a1736b064