linux-cve-announce - CVE-2025-40074: ipv4: start using dst_dev

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Message-ID: <2025102819-CVE-2025-40074-8719@gregkh>
Date: Tue, 28 Oct 2025 12:48:51 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40074: ipv4: start using dst_dev_rcu()

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

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

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

ipv4: start using dst_dev_rcu()

Change icmpv4_xrlim_allow(), ip_defrag() to prevent possible UAF.

Change ipmr_prepare_xmit(), ipmr_queue_fwd_xmit(), ip_mr_output(),
ipv4_neigh_lookup() to use lockdep enabled dst_dev_rcu().

The Linux kernel CVE team has assigned CVE-2025-40074 to this issue.


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

	Issue introduced in 4.13 with commit 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 and fixed in 6.17.3 with commit 923e0734c386984d45de508528a7a7ad91d791cc
	Issue introduced in 4.13 with commit 4a6ce2b6f2ecabbddcfe47e7cf61dd0f00b10e36 and fixed in 6.18-rc1 with commit 6ad8de3cefdb6ffa6708b21c567df0dbf82c43a8

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-2025-40074
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/icmp.c
	net/ipv4/ip_fragment.c
	net/ipv4/ipmr.c
	net/ipv4/route.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/923e0734c386984d45de508528a7a7ad91d791cc
	https://git.kernel.org/stable/c/6ad8de3cefdb6ffa6708b21c567df0dbf82c43a8