linux-cve-announce - CVE-2023-53444: drm/ttm: fix bulk

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Message-ID: <2025091859-CVE-2023-53444-41d9@gregkh>
Date: Thu, 18 Sep 2025 18:04:35 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53444: drm/ttm: fix bulk_move corruption when adding a entry

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

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

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

drm/ttm: fix bulk_move corruption when adding a entry

When the resource is the first in the bulk_move range, adding it again
(thus moving it to the tail) will corrupt the list since the first
pointer is not moved. This eventually lead to null pointer deref in
ttm_lru_bulk_move_del()

The Linux kernel CVE team has assigned CVE-2023-53444 to this issue.


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

	Issue introduced in 5.19 with commit fee2ede155423b0f7a559050a39750b98fe9db69 and fixed in 6.1.42 with commit 70a3015683b007a0db4a1e858791b69afd45fc83
	Issue introduced in 5.19 with commit fee2ede155423b0f7a559050a39750b98fe9db69 and fixed in 6.4.7 with commit e7cf50e41bdc2d574056ebbfeaafc5f0e2562d5b
	Issue introduced in 5.19 with commit fee2ede155423b0f7a559050a39750b98fe9db69 and fixed in 6.5 with commit 4481913607e58196c48a4fef5e6f45350684ec3c

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-2023-53444
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/ttm/ttm_resource.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/70a3015683b007a0db4a1e858791b69afd45fc83
	https://git.kernel.org/stable/c/e7cf50e41bdc2d574056ebbfeaafc5f0e2562d5b
	https://git.kernel.org/stable/c/4481913607e58196c48a4fef5e6f45350684ec3c