linux-cve-announce - CVE-2022-49585: tcp: Fix data-races around sysctl_tcp_fastopen_blackhole

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Message-ID: <2025022609-CVE-2022-49585-659c@gregkh>
Date: Wed, 26 Feb 2025 03:22:28 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2022-49585: tcp: Fix data-races around sysctl_tcp_fastopen_blackhole_timeout.

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

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

tcp: Fix data-races around sysctl_tcp_fastopen_blackhole_timeout.

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

The Linux kernel CVE team has assigned CVE-2022-49585 to this issue.


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

	Issue introduced in 4.12 with commit cf1ef3f0719b4dcb74810ed507e2a2540f9811b4 and fixed in 5.10.134 with commit 0dc2f19d8c2636cebda7976b5ea40c6d69f0d891
	Issue introduced in 4.12 with commit cf1ef3f0719b4dcb74810ed507e2a2540f9811b4 and fixed in 5.15.58 with commit a77a75a0e7f397550ab039f96115103e78dd5c69
	Issue introduced in 4.12 with commit cf1ef3f0719b4dcb74810ed507e2a2540f9811b4 and fixed in 5.18.15 with commit 8afa5604e295046c02b79ccf9e2bbbf8d969d60e
	Issue introduced in 4.12 with commit cf1ef3f0719b4dcb74810ed507e2a2540f9811b4 and fixed in 5.19 with commit 021266ec640c7a4527e6cd4b7349a512b351de1d

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-2022-49585
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/tcp_fastopen.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/0dc2f19d8c2636cebda7976b5ea40c6d69f0d891
	https://git.kernel.org/stable/c/a77a75a0e7f397550ab039f96115103e78dd5c69
	https://git.kernel.org/stable/c/8afa5604e295046c02b79ccf9e2bbbf8d969d60e
	https://git.kernel.org/stable/c/021266ec640c7a4527e6cd4b7349a512b351de1d