linux-cve-announce - CVE-2022-49579: ipv4: Fix data-races around sysctl_fib_multipath_hash

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Message-ID: <2025022608-CVE-2022-49579-4f40@gregkh>
Date: Wed, 26 Feb 2025 03:22:22 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49579: ipv4: Fix data-races around sysctl_fib_multipath_hash_policy.

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

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

ipv4: Fix data-races around sysctl_fib_multipath_hash_policy.

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

The Linux kernel CVE team has assigned CVE-2022-49579 to this issue.

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

	Issue introduced in 4.12 with commit bf4e0a3db97eb882368fd82980b3b1fa0b5b9778 and fixed in 5.15.58 with commit 21fb844bc1dc1461f5038d655aa1a14f39e13049
	Issue introduced in 4.12 with commit bf4e0a3db97eb882368fd82980b3b1fa0b5b9778 and fixed in 5.18.15 with commit 918ee6592ab9a2ff5316d06cfd4aaef60ccabec6
	Issue introduced in 4.12 with commit bf4e0a3db97eb882368fd82980b3b1fa0b5b9778 and fixed in 5.19 with commit 7998c12a08c97cc26660532c9f90a34bd7d8da5a

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-2022-49579
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/ethernet/mellanox/mlxsw/spectrum_router.c
	net/ipv4/route.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/21fb844bc1dc1461f5038d655aa1a14f39e13049
	https://git.kernel.org/stable/c/918ee6592ab9a2ff5316d06cfd4aaef60ccabec6
	https://git.kernel.org/stable/c/7998c12a08c97cc26660532c9f90a34bd7d8da5a