linux-cve-announce - CVE-2026-23165: sfc: fix deadlock in RSS config read

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Message-ID: <2026021419-CVE-2026-23165-3437@gregkh>
Date: Sat, 14 Feb 2026 17:04:31 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2026-23165: sfc: fix deadlock in RSS config read

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

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

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

sfc: fix deadlock in RSS config read

Since cited commit, core locks the net_device's rss_lock when handling
 ethtool -x command, so driver's implementation should not lock it
 again.  Remove the latter.

The Linux kernel CVE team has assigned CVE-2026-23165 to this issue.


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

	Issue introduced in 6.17 with commit 040cef30b5e67271e3193e0206f82b206fc97095 and fixed in 6.18.9 with commit 590c8179ffb01c17644181408821b55b8704c50c
	Issue introduced in 6.17 with commit 040cef30b5e67271e3193e0206f82b206fc97095 and fixed in 6.19 with commit 944c614b0a7afa5b87612c3fb557b95a50ad654c

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-2026-23165
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/sfc/mcdi_filters.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/590c8179ffb01c17644181408821b55b8704c50c
	https://git.kernel.org/stable/c/944c614b0a7afa5b87612c3fb557b95a50ad654c