linux-cve-announce - CVE-2025-38511: drm/xe/pf: Clear all LMTT pages on alloc

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Message-ID: <2025081651-CVE-2025-38511-5370@gregkh>
Date: Sat, 16 Aug 2025 12:57:53 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38511: drm/xe/pf: Clear all LMTT pages on alloc

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

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

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

drm/xe/pf: Clear all LMTT pages on alloc

Our LMEM buffer objects are not cleared by default on alloc
and during VF provisioning we only setup LMTT PTEs for the
actually provisioned LMEM range. But beyond that valid range
we might leave some stale data that could either point to some
other VFs allocations or even to the PF pages.

Explicitly clear all new LMTT page to avoid the risk that a
malicious VF would try to exploit that gap.

While around add asserts to catch any undesired PTE overwrites
and low-level debug traces to track LMTT PT life-cycle.

(cherry picked from commit 3fae6918a3e27cce20ded2551f863fb05d4bef8d)

The Linux kernel CVE team has assigned CVE-2025-38511 to this issue.


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

	Issue introduced in 6.8 with commit b1d20405821812ad70d95eefe58cadc6d50b0917 and fixed in 6.12.39 with commit ff4b8c9ade1b82979fdd01e6f45b60f92eed26d8
	Issue introduced in 6.8 with commit b1d20405821812ad70d95eefe58cadc6d50b0917 and fixed in 6.15.7 with commit 5d21892c2e15b6a27f8bc907693eca7c6b7cc269
	Issue introduced in 6.8 with commit b1d20405821812ad70d95eefe58cadc6d50b0917 and fixed in 6.16 with commit 705a412a367f383430fa34bada387af2e52eb043

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-2025-38511
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_lmtt.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/ff4b8c9ade1b82979fdd01e6f45b60f92eed26d8
	https://git.kernel.org/stable/c/5d21892c2e15b6a27f8bc907693eca7c6b7cc269
	https://git.kernel.org/stable/c/705a412a367f383430fa34bada387af2e52eb043