linux-cve-announce - CVE-2023-53432: firewire: net: fix use after free in fwnet_finish_incoming

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Message-ID: <2025091857-CVE-2023-53432-bc37@gregkh>
Date: Thu, 18 Sep 2025 18:04:23 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53432: firewire: net: fix use after free in fwnet_finish_incoming_packet()

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

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

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

firewire: net: fix use after free in fwnet_finish_incoming_packet()

The netif_rx() function frees the skb so we can't dereference it to
save the skb->len.

The Linux kernel CVE team has assigned CVE-2023-53432 to this issue.


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

	Fixed in 5.15.128 with commit 2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927
	Fixed in 6.1.47 with commit 9040adc38cf6bfbb77034d558ac2c52f70d840ac
	Fixed in 6.4.12 with commit 9860921ab4521252dc39bb21b9c936bd09a00982
	Fixed in 6.5 with commit 3ff256751a2853e1ffaa36958ff933ccc98c6cb5

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-2023-53432
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/firewire/net.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/2ea70379e4f4efa95c9daa7f3f9bdd4d40aec927
	https://git.kernel.org/stable/c/9040adc38cf6bfbb77034d558ac2c52f70d840ac
	https://git.kernel.org/stable/c/9860921ab4521252dc39bb21b9c936bd09a00982
	https://git.kernel.org/stable/c/3ff256751a2853e1ffaa36958ff933ccc98c6cb5