linux-cve-announce - CVE-2022-50748: ipc: mqueue: fix possible memory leak in init_mqueue

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Message-ID: <2025122451-CVE-2022-50748-0136@gregkh>
Date: Wed, 24 Dec 2025 14:05:59 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50748: ipc: mqueue: fix possible memory leak in init_mqueue_fs()

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

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

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

ipc: mqueue: fix possible memory leak in init_mqueue_fs()

commit db7cfc380900 ("ipc: Free mq_sysctls if ipc namespace creation
failed")

Here's a similar memory leak to the one fixed by the patch above.
retire_mq_sysctls need to be called when init_mqueue_fs fails after
setup_mq_sysctls.

The Linux kernel CVE team has assigned CVE-2022-50748 to this issue.


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

	Issue introduced in 5.19 with commit dc55e35f9e810f23dd69cfdc91a3d636023f57a2 and fixed in 5.19.17 with commit a1f321051e0dcf2415fb94f81fdc5044cad4c1d6
	Issue introduced in 5.19 with commit dc55e35f9e810f23dd69cfdc91a3d636023f57a2 and fixed in 6.0.3 with commit 55b3709c6d68e32cd3fdd2a630b1f4c97d51b17c
	Issue introduced in 5.19 with commit dc55e35f9e810f23dd69cfdc91a3d636023f57a2 and fixed in 6.1 with commit c579d60f0d0cd87552f64fdebe68b5d941d20309

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-2022-50748
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:
	ipc/mqueue.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/a1f321051e0dcf2415fb94f81fdc5044cad4c1d6
	https://git.kernel.org/stable/c/55b3709c6d68e32cd3fdd2a630b1f4c97d51b17c
	https://git.kernel.org/stable/c/c579d60f0d0cd87552f64fdebe68b5d941d20309