linux-cve-announce - CVE-2023-53206: hwmon: (pmbus_core) Fix NULL pointer dereference

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Message-ID: <2025091510-CVE-2023-53206-33fc@gregkh>
Date: Mon, 15 Sep 2025 16:21:40 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53206: hwmon: (pmbus_core) Fix NULL pointer dereference

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

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

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

hwmon: (pmbus_core) Fix NULL pointer dereference

Pass i2c_client to _pmbus_is_enabled to drop the assumption
that a regulator device is passed in.

This will fix the issue of a NULL pointer dereference when called from
_pmbus_get_flags.

The Linux kernel CVE team has assigned CVE-2023-53206 to this issue.


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

	Issue introduced in 6.4 with commit df5f6b6af01ca326dd4babb287c9580fed0ad3d6 and fixed in 6.4.8 with commit 7444253cacd92412bc8d33d1c9b5401f52cdf0e2
	Issue introduced in 6.4 with commit df5f6b6af01ca326dd4babb287c9580fed0ad3d6 and fixed in 6.5 with commit 0bd66784274a287beada2933c2c0fa3a0ddae0d7

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-2023-53206
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/hwmon/pmbus/pmbus_core.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/7444253cacd92412bc8d33d1c9b5401f52cdf0e2
	https://git.kernel.org/stable/c/0bd66784274a287beada2933c2c0fa3a0ddae0d7