linux-cve-announce - CVE-2025-22063: netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets

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Message-ID: <2025041607-CVE-2025-22063-dec0@gregkh>
Date: Wed, 16 Apr 2025 16:12:34 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-22063: netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets

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

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

netlabel: Fix NULL pointer exception caused by CALIPSO on IPv4 sockets

When calling netlbl_conn_setattr(), addr->sa_family is used
to determine the function behavior. If sk is an IPv4 socket,
but the connect function is called with an IPv6 address,
the function calipso_sock_setattr() is triggered.
Inside this function, the following code is executed:

sk_fullsock(__sk) ? inet_sk(__sk)->pinet6 : NULL;

Since sk is an IPv4 socket, pinet6 is NULL, leading to a
null pointer dereference.

This patch fixes the issue by checking if inet6_sk(sk)
returns a NULL pointer before accessing pinet6.

The Linux kernel CVE team has assigned CVE-2025-22063 to this issue.


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

	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 5.4.292 with commit 1ad9166cab6a0f5c0b10344a97bdf749ae11dcbf
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 5.10.236 with commit 1e38f7a6cdd68377f8a4189b2fbaec14a6dd5152
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 5.15.180 with commit a7e89541d05b98c79a51c0f95df020f8e82b62ed
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 6.1.134 with commit 797e5371cf55463b4530bab3fef5f27f7c6657a8
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 6.6.87 with commit 1927d0bcd5b81e80971bf6b8eba267508bd1c78b
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 6.12.23 with commit 3ba9cf69de50e8abed32b448616c313baa4c5712
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 6.13.11 with commit 9fe3839588db7519030377b7dee3f165e654f6c5
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 6.14.2 with commit 172a8a996a337206970467e871dd995ac07640b1
	Issue introduced in 4.8 with commit ceba1832b1b2da0149c51de62a847c00bca1677a and fixed in 6.15-rc1 with commit 078aabd567de3d63d37d7673f714e309d369e6e2

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-2025-22063
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/ipv6/calipso.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/1ad9166cab6a0f5c0b10344a97bdf749ae11dcbf
	https://git.kernel.org/stable/c/1e38f7a6cdd68377f8a4189b2fbaec14a6dd5152
	https://git.kernel.org/stable/c/a7e89541d05b98c79a51c0f95df020f8e82b62ed
	https://git.kernel.org/stable/c/797e5371cf55463b4530bab3fef5f27f7c6657a8
	https://git.kernel.org/stable/c/1927d0bcd5b81e80971bf6b8eba267508bd1c78b
	https://git.kernel.org/stable/c/3ba9cf69de50e8abed32b448616c313baa4c5712
	https://git.kernel.org/stable/c/9fe3839588db7519030377b7dee3f165e654f6c5
	https://git.kernel.org/stable/c/172a8a996a337206970467e871dd995ac07640b1
	https://git.kernel.org/stable/c/078aabd567de3d63d37d7673f714e309d369e6e2