linux-cve-announce - CVE-2025-40336: drm/gpusvm: fix hmm_pfn_to_map

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Message-ID: <2025120911-CVE-2025-40336-781e@gregkh>
Date: Tue,  9 Dec 2025 13:10:18 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40336: drm/gpusvm: fix hmm_pfn_to_map_order() usage

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

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

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

drm/gpusvm: fix hmm_pfn_to_map_order() usage

Handle the case where the hmm range partially covers a huge page (like
2M), otherwise we can potentially end up doing something nasty like
mapping memory which is outside the range, and maybe not even mapped by
the mm. Fix is based on the xe userptr code, which in a future patch
will directly use gpusvm, so needs alignment here.

v2:
  - Add kernel-doc (Matt B)
  - s/fls/ilog2/ (Thomas)

The Linux kernel CVE team has assigned CVE-2025-40336 to this issue.


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

	Fixed in 6.17.8 with commit 08e9fd78ba1b9e95141181c69cc51795c9888157
	Fixed in 6.18 with commit c50729c68aaf93611c855752b00e49ce1fdd1558

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-2025-40336
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/drm_gpusvm.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/08e9fd78ba1b9e95141181c69cc51795c9888157
	https://git.kernel.org/stable/c/c50729c68aaf93611c855752b00e49ce1fdd1558