linux-cve-announce - CVE-2026-23024: idpf: fix memory leak of flow steer list on rmmod

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Message-ID: <2026013137-CVE-2026-23024-5861@gregkh>
Date: Sat, 31 Jan 2026 12:39:45 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23024: idpf: fix memory leak of flow steer list on rmmod

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

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

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

idpf: fix memory leak of flow steer list on rmmod

The flow steering list maintains entries that are added and removed as
ethtool creates and deletes flow steering rules. Module removal with active
entries causes memory leak as the list is not properly cleaned up.

Prevent this by iterating through the remaining entries in the list and
freeing the associated memory during module removal. Add a spinlock
(flow_steer_list_lock) to protect the list access from multiple threads.

The Linux kernel CVE team has assigned CVE-2026-23024 to this issue.


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

	Issue introduced in 6.17 with commit ada3e24b84a097b27a823f1ad98e5b2e8c979689 and fixed in 6.18.6 with commit 1aedff70a5e97628eaaf17b169774cb6a45a1dc5
	Issue introduced in 6.17 with commit ada3e24b84a097b27a823f1ad98e5b2e8c979689 and fixed in 6.19-rc5 with commit f9841bd28b600526ca4f6713b0ca49bf7bb98452

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-2026-23024
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/ethernet/intel/idpf/idpf.h
	drivers/net/ethernet/intel/idpf/idpf_ethtool.c
	drivers/net/ethernet/intel/idpf/idpf_lib.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/1aedff70a5e97628eaaf17b169774cb6a45a1dc5
	https://git.kernel.org/stable/c/f9841bd28b600526ca4f6713b0ca49bf7bb98452