linux-cve-announce - CVE-2025-21940: drm/amdkfd: Fix NULL Pointer Dereference in KFD queue

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Message-ID: <2025040135-CVE-2025-21940-f9e9@gregkh>
Date: Tue,  1 Apr 2025 16:40:04 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21940: drm/amdkfd: Fix NULL Pointer Dereference in KFD queue

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

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

drm/amdkfd: Fix NULL Pointer Dereference in KFD queue

Through KFD IOCTL Fuzzing we encountered a NULL pointer derefrence
when calling kfd_queue_acquire_buffers.

(cherry picked from commit 049e5bf3c8406f87c3d8e1958e0a16804fa1d530)

The Linux kernel CVE team has assigned CVE-2025-21940 to this issue.


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

	Issue introduced in 6.12 with commit 629568d25fea8ece4f65073f039aeef4e240ab67 and fixed in 6.12.19 with commit c3cbeafb4e0001d9146df50b470885e02664f3c7
	Issue introduced in 6.12 with commit 629568d25fea8ece4f65073f039aeef4e240ab67 and fixed in 6.13.7 with commit 33eb8041c5d6c19d46e7bfd23a031844336afd80
	Issue introduced in 6.12 with commit 629568d25fea8ece4f65073f039aeef4e240ab67 and fixed in 6.14 with commit fd617ea3b79d2116d53f76cdb5a3601c0ba6e42f

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-2025-21940
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_queue.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/c3cbeafb4e0001d9146df50b470885e02664f3c7
	https://git.kernel.org/stable/c/33eb8041c5d6c19d46e7bfd23a031844336afd80
	https://git.kernel.org/stable/c/fd617ea3b79d2116d53f76cdb5a3601c0ba6e42f