linux-cve-announce - CVE-2023-53733: net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw

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Message-ID: <2025102432-CVE-2023-53733-8b6c@gregkh>
Date: Fri, 24 Oct 2025 13:44:33 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53733: net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode

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

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

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

net: sched: cls_u32: Undo tcf_bind_filter if u32_replace_hw_knode

When u32_replace_hw_knode fails, we need to undo the tcf_bind_filter
operation done at u32_set_parms.

The Linux kernel CVE team has assigned CVE-2023-53733 to this issue.


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

	Issue introduced in 4.7 with commit d34e3e181395192d6d1f50dd97bd7854e04e33a4 and fixed in 6.1.42 with commit a9345793469b65ee5ba7b033239916c2a67d3dd4
	Issue introduced in 4.7 with commit d34e3e181395192d6d1f50dd97bd7854e04e33a4 and fixed in 6.4.7 with commit 025159ed118ba5145b241d574edadb0e00d3c20f
	Issue introduced in 4.7 with commit d34e3e181395192d6d1f50dd97bd7854e04e33a4 and fixed in 6.5 with commit 9cb36faedeafb9720ac236aeae2ea57091d90a09

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-2023-53733
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:
	net/sched/cls_u32.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/a9345793469b65ee5ba7b033239916c2a67d3dd4
	https://git.kernel.org/stable/c/025159ed118ba5145b241d574edadb0e00d3c20f
	https://git.kernel.org/stable/c/9cb36faedeafb9720ac236aeae2ea57091d90a09