linux-cve-announce - CVE-2025-21791: vrf: use RCU protection in l3mdev_l3

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Message-ID: <2025022609-CVE-2025-21791-6074@gregkh>
Date: Wed, 26 Feb 2025 18:17:47 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21791: vrf: use RCU protection in l3mdev_l3_out()

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

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

vrf: use RCU protection in l3mdev_l3_out()

l3mdev_l3_out() can be called without RCU being held:

raw_sendmsg()
 ip_push_pending_frames()
  ip_send_skb()
   ip_local_out()
    __ip_local_out()
     l3mdev_ip_out()

Add rcu_read_lock() / rcu_read_unlock() pair to avoid
a potential UAF.

The Linux kernel CVE team has assigned CVE-2025-21791 to this issue.


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

	Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.1.129 with commit c7574740be8ce68a57d0aece24987b9be2114c3c
	Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.6.79 with commit c40cb5c03e37552d6eff963187109e2c3f78ef6f
	Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.12.16 with commit 022cac1c693add610ae76ede03adf4d9d5a2cf21
	Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.13.4 with commit 7b81425b517accefd46bee854d94954f5c57e019
	Issue introduced in 4.9 with commit a8e3e1a9f02094145580ea7920c6a1d9aabd5539 and fixed in 6.14-rc3 with commit 6d0ce46a93135d96b7fa075a94a88fe0da8e8773

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-2025-21791
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:
	include/net/l3mdev.h


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/c7574740be8ce68a57d0aece24987b9be2114c3c
	https://git.kernel.org/stable/c/c40cb5c03e37552d6eff963187109e2c3f78ef6f
	https://git.kernel.org/stable/c/022cac1c693add610ae76ede03adf4d9d5a2cf21
	https://git.kernel.org/stable/c/7b81425b517accefd46bee854d94954f5c57e019
	https://git.kernel.org/stable/c/6d0ce46a93135d96b7fa075a94a88fe0da8e8773