linux-cve-announce - CVE-2022-50865: tcp: fix a signed-integer-overflow bug in tcp_add

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025123049-CVE-2022-50865-281e@gregkh>
Date: Tue, 30 Dec 2025 13:20:01 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2022-50865: tcp: fix a signed-integer-overflow bug in tcp_add_backlog()

From: Greg Kroah-Hartman <gregkh@...nel.org>

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

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

tcp: fix a signed-integer-overflow bug in tcp_add_backlog()

The type of sk_rcvbuf and sk_sndbuf in struct sock is int, and
in tcp_add_backlog(), the variable limit is caculated by adding
sk_rcvbuf, sk_sndbuf and 64 * 1024, it may exceed the max value
of int and overflow. This patch reduces the limit budget by
halving the sndbuf to solve this issue since ACK packets are much
smaller than the payload.

The Linux kernel CVE team has assigned CVE-2022-50865 to this issue.


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

	Issue introduced in 4.9 with commit c9c3321257e1b95be9b375f811fb250162af8d39 and fixed in 5.4.278 with commit 9d04b4d0feee12bce6bfe37f30d8e953d3c30368
	Issue introduced in 4.9 with commit c9c3321257e1b95be9b375f811fb250162af8d39 and fixed in 5.10.153 with commit 4f23cb2be530785db284a685d1b1c30224d8a538
	Issue introduced in 4.9 with commit c9c3321257e1b95be9b375f811fb250162af8d39 and fixed in 5.15.77 with commit a85d39f14aa8a71e29cfb5eb5de02878a8779898
	Issue introduced in 4.9 with commit c9c3321257e1b95be9b375f811fb250162af8d39 and fixed in 6.0.7 with commit 28addf029417d53b1df062b4c87feb7bc033cb5f
	Issue introduced in 4.9 with commit c9c3321257e1b95be9b375f811fb250162af8d39 and fixed in 6.1 with commit ec791d8149ff60c40ad2074af3b92a39c916a03f

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-2022-50865
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_ipv4.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/9d04b4d0feee12bce6bfe37f30d8e953d3c30368
	https://git.kernel.org/stable/c/4f23cb2be530785db284a685d1b1c30224d8a538
	https://git.kernel.org/stable/c/a85d39f14aa8a71e29cfb5eb5de02878a8779898
	https://git.kernel.org/stable/c/28addf029417d53b1df062b4c87feb7bc033cb5f
	https://git.kernel.org/stable/c/ec791d8149ff60c40ad2074af3b92a39c916a03f