linux-cve-announce - CVE-2022-49576: ipv4: Fix data-races around sysctl_fib_multipath_hash

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Message-ID: <2025022607-CVE-2022-49576-a9e2@gregkh>
Date: Wed, 26 Feb 2025 03:22:19 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49576: ipv4: Fix data-races around sysctl_fib_multipath_hash_fields.

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

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

ipv4: Fix data-races around sysctl_fib_multipath_hash_fields.

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

The Linux kernel CVE team has assigned CVE-2022-49576 to this issue.

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

	Issue introduced in 5.14 with commit ce5c9c20d364f156c885efed8c71fca2945db00f and fixed in 5.15.58 with commit 36f5b86f309b3b11295d087cd7433f1c897caf94
	Issue introduced in 5.14 with commit ce5c9c20d364f156c885efed8c71fca2945db00f and fixed in 5.18.15 with commit 548d6678c4a3d43667e59686665f8674b82440a3
	Issue introduced in 5.14 with commit ce5c9c20d364f156c885efed8c71fca2945db00f and fixed in 5.19 with commit 8895a9c2ac76fb9d3922fed4fe092c8ec5e5cccc

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-2022-49576
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/36f5b86f309b3b11295d087cd7433f1c897caf94
	https://git.kernel.org/stable/c/548d6678c4a3d43667e59686665f8674b82440a3
	https://git.kernel.org/stable/c/8895a9c2ac76fb9d3922fed4fe092c8ec5e5cccc