CVE-2026-74699: drm/xe: Fix memory leak in exec_queue_set_hang_replay_state()

From: Greg Kroah-Hartman <[email protected]>

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

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

drm/xe: Fix memory leak in exec_queue_set_hang_replay_state()

The q->replay_state is blindly overwritten, which can potentially leak
memory that was previously allocated by vmemdup_user().
Return an error if q->replay_state is not empty.

Discovered using AI-assisted static analysis confirmed by Intel Product
Security.

(cherry picked from commit f6b6cc1118bdbc4265fa8b3bdf8565b26f13e56e)

The Linux kernel CVE team has assigned CVE-2026-74699 to this issue.


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

	Issue introduced in 7.0 with commit 1026c1a73a9686ff35ac100039f94f0725622447 and fixed in 7.1.9 with commit 410596743958fbddeb845ff3efe2645397d7c7e2
	Issue introduced in 7.0 with commit 1026c1a73a9686ff35ac100039f94f0725622447 and fixed in 7.2 with commit c5f500161709f27719701334190dff2325868ef0

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-2026-74699
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/xe/xe_exec_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/410596743958fbddeb845ff3efe2645397d7c7e2
	https://git.kernel.org/stable/c/c5f500161709f27719701334190dff2325868ef0