linux-cve-announce - CVE-2024-53164: net: sched: fix ordering of qlen adjustment

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Message-ID: <2024122746-CVE-2024-53164-752a@gregkh>
Date: Fri, 27 Dec 2024 14:38:47 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2024-53164: net: sched: fix ordering of qlen adjustment

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

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

net: sched: fix ordering of qlen adjustment

Changes to sch->q.qlen around qdisc_tree_reduce_backlog() need to happen
_before_ a call to said function because otherwise it may fail to notify
parent qdiscs when the child is about to become empty.

The Linux kernel CVE team has assigned CVE-2024-53164 to this issue.


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

	Fixed in 6.1.122 with commit 489422e2befff88a1de52b2acebe7b333bded025
	Fixed in 6.6.68 with commit 97e13434b5da8e91bdf965352fad2141d13d72d3
	Fixed in 6.12.7 with commit e3e54ad9eff8bdaa70f897e5342e34b76109497f
	Fixed in 6.13-rc2 with commit 5eb7de8cd58e73851cd37ff8d0666517d9926948

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-2024-53164
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/sch_cake.c
	net/sched/sch_choke.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/489422e2befff88a1de52b2acebe7b333bded025
	https://git.kernel.org/stable/c/97e13434b5da8e91bdf965352fad2141d13d72d3
	https://git.kernel.org/stable/c/e3e54ad9eff8bdaa70f897e5342e34b76109497f
	https://git.kernel.org/stable/c/5eb7de8cd58e73851cd37ff8d0666517d9926948