linux-cve-announce - CVE-2025-39740: drm/xe/migrate: prevent potential UAF

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Message-ID: <2025091138-CVE-2025-39740-6b46@gregkh>
Date: Thu, 11 Sep 2025 18:52:41 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-39740: drm/xe/migrate: prevent potential UAF

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

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

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

drm/xe/migrate: prevent potential UAF

If we hit the error path, the previous fence (if there is one) has
already been put() prior to this, so doing a fence_wait could lead to
UAF. Tweak the flow to do to the put() until after we do the wait.

(cherry picked from commit 9b7ca35ed28fe5fad86e9d9c24ebd1271e4c9c3e)

The Linux kernel CVE team has assigned CVE-2025-39740 to this issue.


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

	Issue introduced in 6.16 with commit 270172f64b114451876c1b68912653e72ab99f38 and fixed in 6.16.2 with commit 7e46fa64a4b94208563c3a5bf1d7f4346f94abea
	Issue introduced in 6.16 with commit 270172f64b114451876c1b68912653e72ab99f38 and fixed in 6.17-rc2 with commit 145832fbdd17b1d77ffd6cdd1642259e101d1b7e

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-2025-39740
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_migrate.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/7e46fa64a4b94208563c3a5bf1d7f4346f94abea
	https://git.kernel.org/stable/c/145832fbdd17b1d77ffd6cdd1642259e101d1b7e