linux-cve-announce - CVE-2023-54324: dm: fix a race condition in retrieve

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Message-ID: <2025123015-CVE-2023-54324-7149@gregkh>
Date: Tue, 30 Dec 2025 13:37:19 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54324: dm: fix a race condition in retrieve_deps

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

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

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

dm: fix a race condition in retrieve_deps

There's a race condition in the multipath target when retrieve_deps
races with multipath_message calling dm_get_device and dm_put_device.
retrieve_deps walks the list of open devices without holding any lock
but multipath may add or remove devices to the list while it is
running. The end result may be memory corruption or use-after-free
memory access.

See this description of a UAF with multipath_message():
https://listman.redhat.com/archives/dm-devel/2022-October/052373.html

Fix this bug by introducing a new rw semaphore "devices_lock". We grab
devices_lock for read in retrieve_deps and we grab it for write in
dm_get_device and dm_put_device.

The Linux kernel CVE team has assigned CVE-2023-54324 to this issue.


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

	Fixed in 6.1.56 with commit dbf1a719850577bb51fc7512a3972994b797a17b
	Fixed in 6.5.5 with commit 38f6e5ae5d9ff4a4050ea6f7b543d5d5a4e087cf
	Fixed in 6.6 with commit f6007dce0cd35d634d9be91ef3515a6385dcee16

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-2023-54324
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/md/dm-core.h
	drivers/md/dm-ioctl.c
	drivers/md/dm-table.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/dbf1a719850577bb51fc7512a3972994b797a17b
	https://git.kernel.org/stable/c/38f6e5ae5d9ff4a4050ea6f7b543d5d5a4e087cf
	https://git.kernel.org/stable/c/f6007dce0cd35d634d9be91ef3515a6385dcee16