linux-cve-announce - CVE-2025-21757: net: ipv6: fix dst refleaks in rpl, seg6 and ioam6 lwtunnels

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Message-ID: <2025022603-CVE-2025-21757-912a@gregkh>
Date: Wed, 26 Feb 2025 18:17:13 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21757: net: ipv6: fix dst refleaks in rpl, seg6 and ioam6 lwtunnels

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

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

net: ipv6: fix dst refleaks in rpl, seg6 and ioam6 lwtunnels

dst_cache_get() gives us a reference, we need to release it.

Discovered by the ioam6.sh test, kmemleak was recently fixed
to catch per-cpu memory leaks.

The Linux kernel CVE team has assigned CVE-2025-21757 to this issue.


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

	Issue introduced in 6.14-rc1 with commit 985ec6f5e6235242191370628acb73d7a9f0c0ea and fixed in 6.14-rc2 with commit c71a192976ded2f2f416d03c4f595cdd4478b825

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-2025-21757
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/ioam6_iptunnel.c
	net/ipv6/rpl_iptunnel.c
	net/ipv6/seg6_iptunnel.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/2248b8145053eb2ae35ca4cf694b885a086719bb
	https://git.kernel.org/stable/c/d90f8f930c3053bb11f5def9aff5310a70429260
	https://git.kernel.org/stable/c/c71a192976ded2f2f416d03c4f595cdd4478b825