linux-cve-announce - CVE-2022-49630: tcp: Fix a data-race around sysctl_tcp_ecn

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Message-ID: <2025022616-CVE-2022-49630-71c3@gregkh>
Date: Wed, 26 Feb 2025 03:23:13 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49630: tcp: Fix a data-race around sysctl_tcp_ecn_fallback.

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

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

tcp: Fix a data-race around sysctl_tcp_ecn_fallback.

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

The Linux kernel CVE team has assigned CVE-2022-49630 to this issue.

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

	Issue introduced in 4.2 with commit 492135557dc090a1abb2cfbe1a412757e3ed68ab and fixed in 5.15.56 with commit 8bcf7339f2cf70ea4461df6ea045d1aadfabfa11
	Issue introduced in 4.2 with commit 492135557dc090a1abb2cfbe1a412757e3ed68ab and fixed in 5.18.13 with commit 1ec3d6c2626ee6e1b36b7bd006873a271406ba61
	Issue introduced in 4.2 with commit 492135557dc090a1abb2cfbe1a412757e3ed68ab and fixed in 5.19 with commit 12b8d9ca7e678abc48195294494f1815b555d658

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-2022-49630
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/sysctl_net_ipv4.c
	net/ipv4/tcp_output.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/8bcf7339f2cf70ea4461df6ea045d1aadfabfa11
	https://git.kernel.org/stable/c/1ec3d6c2626ee6e1b36b7bd006873a271406ba61
	https://git.kernel.org/stable/c/12b8d9ca7e678abc48195294494f1815b555d658