linux-cve-announce - CVE-2025-68326: drm/xe/guc: Fix stack

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Message-ID: <2025122227-CVE-2025-68326-9839@gregkh>
Date: Mon, 22 Dec 2025 17:12:28 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68326: drm/xe/guc: Fix stack_depot usage

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

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

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

drm/xe/guc: Fix stack_depot usage

Add missing stack_depot_init() call when CONFIG_DRM_XE_DEBUG_GUC is
enabled to fix the following call stack:

	[] BUG: kernel NULL pointer dereference, address: 0000000000000000
	[] Workqueue:  drm_sched_run_job_work [gpu_sched]
	[] RIP: 0010:stack_depot_save_flags+0x172/0x870
	[] Call Trace:
	[]  <TASK>
	[]  fast_req_track+0x58/0xb0 [xe]

(cherry picked from commit 64fdf496a6929a0a194387d2bb5efaf5da2b542f)

The Linux kernel CVE team has assigned CVE-2025-68326 to this issue.


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

	Issue introduced in 6.17 with commit 16b7e65d299d56442879405ac85800877fa51355 and fixed in 6.17.11 with commit 1966838d1c82149cbf4a652322d26a6e5aae9c4e
	Issue introduced in 6.17 with commit 16b7e65d299d56442879405ac85800877fa51355 and fixed in 6.18 with commit 0e234632e39bd21dd28ffc9ba3ae8eec4deb949c

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-2025-68326
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_guc_ct.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/1966838d1c82149cbf4a652322d26a6e5aae9c4e
	https://git.kernel.org/stable/c/0e234632e39bd21dd28ffc9ba3ae8eec4deb949c