linux-cve-announce - CVE-2025-40239: net: phy: micrel: always set shared->phydev for LAN8814

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Message-ID: <2025120402-CVE-2025-40239-beb9@gregkh>
Date: Thu,  4 Dec 2025 16:32:14 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-40239: net: phy: micrel: always set shared->phydev for LAN8814

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

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

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

net: phy: micrel: always set shared->phydev for LAN8814

Currently, during the LAN8814 PTP probe shared->phydev is only set if PTP
clock gets actually set, otherwise the function will return before setting
it.

This is an issue as shared->phydev is unconditionally being used when IRQ
is being handled, especially in lan8814_gpio_process_cap and since it was
not set it will cause a NULL pointer exception and crash the kernel.

So, simply always set shared->phydev to avoid the NULL pointer exception.

The Linux kernel CVE team has assigned CVE-2025-40239 to this issue.


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

	Issue introduced in 6.10 with commit b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746 and fixed in 6.12.56 with commit da1ef8e9eb5d4a12bec32d11636e521e7d529b9e
	Issue introduced in 6.10 with commit b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746 and fixed in 6.17.6 with commit b093b06826b836c2824858669db080c190c04715
	Issue introduced in 6.10 with commit b3f1a08fcf0dd58d99b14b9f8fbd1929f188b746 and fixed in 6.18 with commit 399d10934740ae8cdaa4e3245f7c5f6c332da844

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-2025-40239
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/phy/micrel.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/da1ef8e9eb5d4a12bec32d11636e521e7d529b9e
	https://git.kernel.org/stable/c/b093b06826b836c2824858669db080c190c04715
	https://git.kernel.org/stable/c/399d10934740ae8cdaa4e3245f7c5f6c332da844