linux-cve-announce - CVE-2022-49766: netlink: Bounds-check struct nlmsgerr creation

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Message-ID: <2025050114-CVE-2022-49766-7b16@gregkh>
Date: Thu,  1 May 2025 16:09:16 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-49766: netlink: Bounds-check struct nlmsgerr creation

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

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

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

netlink: Bounds-check struct nlmsgerr creation

In preparation for FORTIFY_SOURCE doing bounds-check on memcpy(),
switch from __nlmsg_put to nlmsg_put(), and explain the bounds check
for dealing with the memcpy() across a composite flexible array struct.
Avoids this future run-time warning:

  memcpy: detected field-spanning write (size 32) of single field "&errmsg->msg" at net/netlink/af_netlink.c:2447 (size 16)

The Linux kernel CVE team has assigned CVE-2022-49766 to this issue.


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

	Fixed in 6.0.10 with commit aff4eb16f589c3af322a2582044bca365381fcd6
	Fixed in 6.1 with commit 710d21fdff9a98d621cd4e64167f3ef8af4e2fd1

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-2022-49766
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/netfilter/ipset/ip_set_core.c
	net/netlink/af_netlink.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/aff4eb16f589c3af322a2582044bca365381fcd6
	https://git.kernel.org/stable/c/710d21fdff9a98d621cd4e64167f3ef8af4e2fd1