linux-cve-announce - CVE-2025-21903: mctp i3c: handle NULL header address

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Message-ID: <2025040128-CVE-2025-21903-4dbf@gregkh>
Date: Tue,  1 Apr 2025 16:39:27 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21903: mctp i3c: handle NULL header address

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

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

mctp i3c: handle NULL header address

daddr can be NULL if there is no neighbour table entry present,
in that case the tx packet should be dropped.

saddr will usually be set by MCTP core, but check for NULL in case a
packet is transmitted by a different protocol.

The Linux kernel CVE team has assigned CVE-2025-21903 to this issue.


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

	Issue introduced in 6.7 with commit c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 and fixed in 6.12.19 with commit d8be54c35aee29d96d1350b1b6f153be4da37c07
	Issue introduced in 6.7 with commit c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 and fixed in 6.13.7 with commit 740bf9c9b715cc327d34b1e2d4ee79fcd4c47a56
	Issue introduced in 6.7 with commit c8755b29b58ec65be17bcb8c40763d2dcb1f1db5 and fixed in 6.14 with commit cf7ee25e70c6edfac4553d6b671e8b19db1d9573

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-2025-21903
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:
	drivers/net/mctp/mctp-i3c.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/d8be54c35aee29d96d1350b1b6f153be4da37c07
	https://git.kernel.org/stable/c/740bf9c9b715cc327d34b1e2d4ee79fcd4c47a56
	https://git.kernel.org/stable/c/cf7ee25e70c6edfac4553d6b671e8b19db1d9573