linux-cve-announce - CVE-2022-49893: cxl/region: Fix cxl_region leak, cleanup targets at region delete

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Message-ID: <2025050158-CVE-2022-49893-209a@gregkh>
Date: Thu,  1 May 2025 16:11:23 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49893: cxl/region: Fix cxl_region leak, cleanup targets at region delete

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

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

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

cxl/region: Fix cxl_region leak, cleanup targets at region delete

When a region is deleted any targets that have been previously assigned
to that region hold references to it. Trigger those references to
drop by detaching all targets at unregister_region() time.

Otherwise that region object will leak as userspace has lost the ability
to detach targets once region sysfs is torn down.

The Linux kernel CVE team has assigned CVE-2022-49893 to this issue.


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

	Issue introduced in 6.0 with commit b9686e8c8e39d4072081ef078c04915ee51c8af4 and fixed in 6.0.8 with commit 45d9fb4b758b9d602ee7776eb6754b0349946aad
	Issue introduced in 6.0 with commit b9686e8c8e39d4072081ef078c04915ee51c8af4 and fixed in 6.1 with commit 0d9e734018d70cecf79e2e4c6082167160a0f13f

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-2022-49893
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/cxl/core/region.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/45d9fb4b758b9d602ee7776eb6754b0349946aad
	https://git.kernel.org/stable/c/0d9e734018d70cecf79e2e4c6082167160a0f13f