linux-cve-announce - CVE-2022-49637: ipv4: Fix a data-race around sysctl_fib_sync

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Message-ID: <2025022618-CVE-2022-49637-402f@gregkh>
Date: Wed, 26 Feb 2025 03:23:20 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49637: ipv4: Fix a data-race around sysctl_fib_sync_mem.

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

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

ipv4: Fix a data-race around sysctl_fib_sync_mem.

While reading sysctl_fib_sync_mem, it can be changed concurrently.
So, we need to add READ_ONCE() to avoid a data-race.

The Linux kernel CVE team has assigned CVE-2022-49637 to this issue.


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

	Issue introduced in 5.2 with commit 9ab948a91b2c2abc8e82845c0e61f4b1683e3a4f and fixed in 5.4.207 with commit 7c1acd98fb221dc0d847451b9ab86319f8b9916c
	Issue introduced in 5.2 with commit 9ab948a91b2c2abc8e82845c0e61f4b1683e3a4f and fixed in 5.10.132 with commit 418b191d5f223a8cb6cab09eae1f72c04ba6adf2
	Issue introduced in 5.2 with commit 9ab948a91b2c2abc8e82845c0e61f4b1683e3a4f and fixed in 5.15.56 with commit 9be8aac91960ea32fd0e874758c9afee665c57d2
	Issue introduced in 5.2 with commit 9ab948a91b2c2abc8e82845c0e61f4b1683e3a4f and fixed in 5.18.13 with commit 190cd4ff128373271e065afb20f1d2247b3f10c3
	Issue introduced in 5.2 with commit 9ab948a91b2c2abc8e82845c0e61f4b1683e3a4f and fixed in 5.19 with commit 73318c4b7dbd0e781aaababff17376b2894745c0

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-2022-49637
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/ipv4/fib_trie.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/7c1acd98fb221dc0d847451b9ab86319f8b9916c
	https://git.kernel.org/stable/c/418b191d5f223a8cb6cab09eae1f72c04ba6adf2
	https://git.kernel.org/stable/c/9be8aac91960ea32fd0e874758c9afee665c57d2
	https://git.kernel.org/stable/c/190cd4ff128373271e065afb20f1d2247b3f10c3
	https://git.kernel.org/stable/c/73318c4b7dbd0e781aaababff17376b2894745c0