linux-cve-announce - CVE-2025-40086: drm/xe: Don't allow evicting of BOs in same VM in array of VM binds

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Message-ID: <2025103013-CVE-2025-40086-f0f7@gregkh>
Date: Thu, 30 Oct 2025 10:48:13 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40086: drm/xe: Don't allow evicting of BOs in same VM in array of VM binds

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

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

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

drm/xe: Don't allow evicting of BOs in same VM in array of VM binds

An array of VM binds can potentially evict other buffer objects (BOs)
within the same VM under certain conditions, which may lead to NULL
pointer dereferences later in the bind pipeline. To prevent this, clear
the allow_res_evict flag in the xe_bo_validate call.

v2:
 - Invert polarity of no_res_evict (Thomas)
 - Add comment in code explaining issue (Thomas)

(cherry picked from commit 8b9ba8d6d95fe75fed6b0480bb03da4b321bea08)

The Linux kernel CVE team has assigned CVE-2025-40086 to this issue.


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

	Issue introduced in 6.8 with commit dd08ebf6c3525a7ea2186e636df064ea47281987 and fixed in 6.17.5 with commit 5aa0ab0ba7d94549cfe17d6ef7a4f33ba1de8384
	Issue introduced in 6.8 with commit dd08ebf6c3525a7ea2186e636df064ea47281987 and fixed in 6.18-rc2 with commit 7ac74613e5f2ef3450f44fd2127198662c2563a9

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-2025-40086
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_vm.c
	drivers/gpu/drm/xe/xe_vm_types.h


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/5aa0ab0ba7d94549cfe17d6ef7a4f33ba1de8384
	https://git.kernel.org/stable/c/7ac74613e5f2ef3450f44fd2127198662c2563a9