linux-cve-announce - CVE-2022-50042: net: genl: fix error path memory leak in policy dumping

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Message-ID: <2025061843-CVE-2022-50042-7d6f@gregkh>
Date: Wed, 18 Jun 2025 13:01:47 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50042: net: genl: fix error path memory leak in policy dumping

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

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

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

net: genl: fix error path memory leak in policy dumping

If construction of the array of policies fails when recording
non-first policy we need to unwind.

netlink_policy_dump_add_policy() itself also needs fixing as
it currently gives up on error without recording the allocated
pointer in the pstate pointer.

The Linux kernel CVE team has assigned CVE-2022-50042 to this issue.


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

	Issue introduced in 5.10 with commit 50a896cf2d6f34e884a00139d6e6012c9833ace3 and fixed in 5.10.138 with commit 83411c9f05d5a8b637293b3389eca3d378197c04
	Issue introduced in 5.10 with commit 50a896cf2d6f34e884a00139d6e6012c9833ace3 and fixed in 5.15.63 with commit b0672895d8be5d19d4b05ac83f807026fc791037
	Issue introduced in 5.10 with commit 50a896cf2d6f34e884a00139d6e6012c9833ace3 and fixed in 5.19.4 with commit 26b6acd365823e99e46be3b27500f5dc235dda5e
	Issue introduced in 5.10 with commit 50a896cf2d6f34e884a00139d6e6012c9833ace3 and fixed in 6.0 with commit 249801360db3dec4f73768c502192020bfddeacc

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-2022-50042
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:
	net/netlink/genetlink.c
	net/netlink/policy.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/83411c9f05d5a8b637293b3389eca3d378197c04
	https://git.kernel.org/stable/c/b0672895d8be5d19d4b05ac83f807026fc791037
	https://git.kernel.org/stable/c/26b6acd365823e99e46be3b27500f5dc235dda5e
	https://git.kernel.org/stable/c/249801360db3dec4f73768c502192020bfddeacc