linux-cve-announce - CVE-2025-68187: net: mdio: Check regmap pointer returned by device_node_to

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Message-ID: <2025121633-CVE-2025-68187-630c@gregkh>
Date: Tue, 16 Dec 2025 14:43:48 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68187: net: mdio: Check regmap pointer returned by device_node_to_regmap()

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

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

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

net: mdio: Check regmap pointer returned by device_node_to_regmap()

The call to device_node_to_regmap() in airoha_mdio_probe() can return
an ERR_PTR() if regmap initialization fails. Currently, the driver
stores the pointer without validation, which could lead to a crash
if it is later dereferenced.

Add an IS_ERR() check and return the corresponding error code to make
the probe path more robust.

The Linux kernel CVE team has assigned CVE-2025-68187 to this issue.


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

	Issue introduced in 6.17 with commit 67e3ba978361cb262f8f8981ab88ccb97f1e2bda and fixed in 6.17.8 with commit dc8ed3823473bb38ba43cfb34f1e1c1baa22f975
	Issue introduced in 6.17 with commit 67e3ba978361cb262f8f8981ab88ccb97f1e2bda and fixed in 6.18 with commit b2b526c2cf57d14ee269e012ed179081871f45a1

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-2025-68187
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/mdio/mdio-airoha.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/dc8ed3823473bb38ba43cfb34f1e1c1baa22f975
	https://git.kernel.org/stable/c/b2b526c2cf57d14ee269e012ed179081871f45a1