linux-cve-announce - CVE-2022-49589: igmp: Fix data-races around sysctl_igmp

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Message-ID: <2025022609-CVE-2022-49589-fb90@gregkh>
Date: Wed, 26 Feb 2025 03:22:32 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49589: igmp: Fix data-races around sysctl_igmp_qrv.

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

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

igmp: Fix data-races around sysctl_igmp_qrv.

While reading sysctl_igmp_qrv, it can be changed concurrently.
Thus, we need to add READ_ONCE() to its readers.

This test can be packed into a helper, so such changes will be in the
follow-up series after net is merged into net-next.

  qrv ?: READ_ONCE(net->ipv4.sysctl_igmp_qrv);

The Linux kernel CVE team has assigned CVE-2022-49589 to this issue.


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

	Issue introduced in 3.18 with commit a9fe8e29945d56f35235a3a0fba99b4cf181d211 and fixed in 4.19.255 with commit 9eeb3a7702998bdccbfcc37997b5dd9215b9a7f7
	Issue introduced in 3.18 with commit a9fe8e29945d56f35235a3a0fba99b4cf181d211 and fixed in 5.4.209 with commit e20dd1b0e0ea15bee1e528536a0840dba972ca0e
	Issue introduced in 3.18 with commit a9fe8e29945d56f35235a3a0fba99b4cf181d211 and fixed in 5.10.135 with commit b399ffafffba39f47b731b26a5da1dc0ffc4b3ad
	Issue introduced in 3.18 with commit a9fe8e29945d56f35235a3a0fba99b4cf181d211 and fixed in 5.15.59 with commit c721324afc589f8ea54bae04756b150aeaae5fa4
	Issue introduced in 3.18 with commit a9fe8e29945d56f35235a3a0fba99b4cf181d211 and fixed in 5.18.15 with commit c2954671010cd1127d1ffa328c6e6f8e99930982
	Issue introduced in 3.18 with commit a9fe8e29945d56f35235a3a0fba99b4cf181d211 and fixed in 5.19 with commit 8ebcc62c738f68688ee7c6fec2efe5bc6d3d7e60

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-2022-49589
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/net/amt.c
	net/ipv4/igmp.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/9eeb3a7702998bdccbfcc37997b5dd9215b9a7f7
	https://git.kernel.org/stable/c/e20dd1b0e0ea15bee1e528536a0840dba972ca0e
	https://git.kernel.org/stable/c/b399ffafffba39f47b731b26a5da1dc0ffc4b3ad
	https://git.kernel.org/stable/c/c721324afc589f8ea54bae04756b150aeaae5fa4
	https://git.kernel.org/stable/c/c2954671010cd1127d1ffa328c6e6f8e99930982
	https://git.kernel.org/stable/c/8ebcc62c738f68688ee7c6fec2efe5bc6d3d7e60