linux-cve-announce - CVE-2025-40332: drm/amdkfd: Fix mmap write lock not release

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Message-ID: <2025120910-CVE-2025-40332-7e62@gregkh>
Date: Tue,  9 Dec 2025 13:10:14 +0900
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40332: drm/amdkfd: Fix mmap write lock not release

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

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

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

drm/amdkfd: Fix mmap write lock not release

If mmap write lock is taken while draining retry fault, mmap write lock
is not released because svm_range_restore_pages calls mmap_read_unlock
then returns. This causes deadlock and system hangs later because mmap
read or write lock cannot be taken.

Downgrade mmap write lock to read lock if draining retry fault fix this
bug.

The Linux kernel CVE team has assigned CVE-2025-40332 to this issue.


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

	Fixed in 6.12.58 with commit e2105ba1c262dcaa9573f11844b6e1e1ca762c3f
	Fixed in 6.17.8 with commit f7569ef1cf978aa87aa81b5e9bf40a77497f3685
	Fixed in 6.18 with commit 7574f30337e19045f03126b4c51f525b84e5049e

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-2025-40332
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/amd/amdkfd/kfd_svm.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/e2105ba1c262dcaa9573f11844b6e1e1ca762c3f
	https://git.kernel.org/stable/c/f7569ef1cf978aa87aa81b5e9bf40a77497f3685
	https://git.kernel.org/stable/c/7574f30337e19045f03126b4c51f525b84e5049e