linux-cve-announce - CVE-2025-37932: sch_htb: make htb_qlen

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Message-ID: <2025052006-CVE-2025-37932-0842@gregkh>
Date: Tue, 20 May 2025 17:22:28 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-37932: sch_htb: make htb_qlen_notify() idempotent

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

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

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

sch_htb: make htb_qlen_notify() idempotent

htb_qlen_notify() always deactivates the HTB class and in fact could
trigger a warning if it is already deactivated. Therefore, it is not
idempotent and not friendly to its callers, like fq_codel_dequeue().

Let's make it idempotent to ease qdisc_tree_reduce_backlog() callers'
life.

The Linux kernel CVE team has assigned CVE-2025-37932 to this issue.


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

	Fixed in 6.1.138 with commit 73cf6af13153d62f9b76eff422eea79dbc70f15e
	Fixed in 6.6.90 with commit bbbf5e0f87078b715e7a665d662a2c0e77f044ae
	Fixed in 6.12.28 with commit 0a188c0e197383683fd093ab1ea6ce9a5869a6ea
	Fixed in 6.14.6 with commit a61f1b5921761fbaf166231418bc1db301e5bf59
	Fixed in 6.15-rc2 with commit 5ba8b837b522d7051ef81bacf3d95383ff8edce5

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-2025-37932
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_htb.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/73cf6af13153d62f9b76eff422eea79dbc70f15e
	https://git.kernel.org/stable/c/bbbf5e0f87078b715e7a665d662a2c0e77f044ae
	https://git.kernel.org/stable/c/0a188c0e197383683fd093ab1ea6ce9a5869a6ea
	https://git.kernel.org/stable/c/a61f1b5921761fbaf166231418bc1db301e5bf59
	https://git.kernel.org/stable/c/5ba8b837b522d7051ef81bacf3d95383ff8edce5