linux-cve-announce - CVE-2025-21743: usbnet: ipheth: fix possible overflow in DPE length check

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Message-ID: <2025022600-CVE-2025-21743-c67f@gregkh>
Date: Wed, 26 Feb 2025 18:11:25 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21743: usbnet: ipheth: fix possible overflow in DPE length check

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

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

usbnet: ipheth: fix possible overflow in DPE length check

Originally, it was possible for the DPE length check to overflow if
wDatagramIndex + wDatagramLength > U16_MAX. This could lead to an OoB
read.

Move the wDatagramIndex term to the other side of the inequality.

An existing condition ensures that wDatagramIndex < urb->actual_length.

The Linux kernel CVE team has assigned CVE-2025-21743 to this issue.


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

	Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.6.78 with commit 18bf6f5cce3172cb303c3f0551aa9443d5ed74f8
	Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.12.14 with commit d677e7dd59ad6837496f5a02d8e5d39824278dfd
	Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.13.3 with commit d824a964185910e317287f034c0a439c08b4fe49
	Issue introduced in 6.5 with commit a2d274c62e44b1995c170595db3865c6fe701226 and fixed in 6.14-rc1 with commit c219427ed296f94bb4b91d08626776dc7719ee27

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-2025-21743
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/usb/ipheth.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/18bf6f5cce3172cb303c3f0551aa9443d5ed74f8
	https://git.kernel.org/stable/c/d677e7dd59ad6837496f5a02d8e5d39824278dfd
	https://git.kernel.org/stable/c/d824a964185910e317287f034c0a439c08b4fe49
	https://git.kernel.org/stable/c/c219427ed296f94bb4b91d08626776dc7719ee27