linux-cve-announce - CVE-2023-53068: net: usb: lan78xx: Limit packet length to skb->len

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Message-ID: <2025050212-CVE-2023-53068-0127@gregkh>
Date: Fri,  2 May 2025 17:55:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53068: net: usb: lan78xx: Limit packet length to skb->len

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

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

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

net: usb: lan78xx: Limit packet length to skb->len

Packet length retrieved from descriptor may be larger than
the actual socket buffer length. In such case the cloned
skb passed up the network stack will leak kernel memory contents.

Additionally prevent integer underflow when size is less than
ETH_FCS_LEN.

The Linux kernel CVE team has assigned CVE-2023-53068 to this issue.


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

	Issue introduced in 4.3 with commit 55d7de9de6c30adce8d675c7ce513e283829c2ff and fixed in 6.1.22 with commit 83de34967473ed31d276381373713cc2869a42e5
	Issue introduced in 4.3 with commit 55d7de9de6c30adce8d675c7ce513e283829c2ff and fixed in 6.2.9 with commit 44b9ed73369fc5ec85dd2ee487e986301792a82d
	Issue introduced in 4.3 with commit 55d7de9de6c30adce8d675c7ce513e283829c2ff and fixed in 6.3 with commit 7f247f5a2c18b3f21206cdd51193df4f38e1b9f5

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-2023-53068
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/lan78xx.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/83de34967473ed31d276381373713cc2869a42e5
	https://git.kernel.org/stable/c/44b9ed73369fc5ec85dd2ee487e986301792a82d
	https://git.kernel.org/stable/c/7f247f5a2c18b3f21206cdd51193df4f38e1b9f5