linux-cve-announce - CVE-2025-38036: drm/xe/vf: Perform early GT MMIO initialization to read GMDID

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Message-ID: <2025061826-CVE-2025-38036-0063@gregkh>
Date: Wed, 18 Jun 2025 11:33:32 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38036: drm/xe/vf: Perform early GT MMIO initialization to read GMDID

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

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

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

drm/xe/vf: Perform early GT MMIO initialization to read GMDID

VFs need to communicate with the GuC to obtain the GMDID value
and existing GuC functions used for that assume that the GT has
it's MMIO members already setup. However, due to recent refactoring
the gt->mmio is initialized later, and any attempt by the VF to use
xe_mmio_read|write() from GuC functions will lead to NPD crash due
to unset MMIO register address:

[] xe 0000:00:02.1: [drm] Running in SR-IOV VF mode
[] xe 0000:00:02.1: [drm] GT0: sending H2G MMIO 0x5507
[] BUG: unable to handle page fault for address: 0000000000190240

Since we are already tweaking the id and type of the primary GT to
mimic it's a Media GT before initializing the GuC communication,
we can also call xe_gt_mmio_init() to perform early setup of the
gt->mmio which will make those GuC functions work again.

The Linux kernel CVE team has assigned CVE-2025-38036 to this issue.

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

	Fixed in 6.14.9 with commit ef6e950aea76a5009ccc79ebfa955ecc66cd85a2
	Fixed in 6.15 with commit 13265fe7426ec9ba5aa86baab913417ca361e8a4

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-2025-38036
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_pci.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/ef6e950aea76a5009ccc79ebfa955ecc66cd85a2
	https://git.kernel.org/stable/c/13265fe7426ec9ba5aa86baab913417ca361e8a4