linux-cve-announce - CVE-2025-68207: drm/xe/guc: Synchronize Dead CT worker with unbind

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Message-ID: <2025121632-CVE-2025-68207-c0f2@gregkh>
Date: Tue, 16 Dec 2025 14:54:36 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68207: drm/xe/guc: Synchronize Dead CT worker with unbind

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

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

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

drm/xe/guc: Synchronize Dead CT worker with unbind

Cancel and wait for any Dead CT worker to complete before continuing
with device unbinding. Else the worker will end up using resources freed
by the undind operation.

(cherry picked from commit 492671339114e376aaa38626d637a2751cdef263)

The Linux kernel CVE team has assigned CVE-2025-68207 to this issue.


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

	Issue introduced in 6.12.37 with commit ff6482fb458953e111a82b7c537363d9aacf04bf and fixed in 6.12.59 with commit 35959ab7d16b618616edf6df882a4533d2efe193
	Issue introduced in 6.13 with commit d2c5a5a926f43b2e42c5c955f917bad8ad6dd68c and fixed in 6.17.9 with commit ce6ccf8e881a919bf902174ac879f80c97669498
	Issue introduced in 6.13 with commit d2c5a5a926f43b2e42c5c955f917bad8ad6dd68c and fixed in 6.18 with commit 95af8f4fdce8349a5fe75264007f1af2aa1082ea

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-2025-68207
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/35959ab7d16b618616edf6df882a4533d2efe193
	https://git.kernel.org/stable/c/ce6ccf8e881a919bf902174ac879f80c97669498
	https://git.kernel.org/stable/c/95af8f4fdce8349a5fe75264007f1af2aa1082ea