linux-cve-announce - CVE-2025-21814: ptp: Ensure info->enable callback is always set

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Message-ID: <2025022709-CVE-2025-21814-d723@gregkh>
Date: Thu, 27 Feb 2025 12:03:11 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21814: ptp: Ensure info->enable callback is always set

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

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

ptp: Ensure info->enable callback is always set

The ioctl and sysfs handlers unconditionally call the ->enable callback.
Not all drivers implement that callback, leading to NULL dereferences.
Example of affected drivers: ptp_s390.c, ptp_vclock.c and ptp_mock.c.

Instead use a dummy callback if no better was specified by the driver.

The Linux kernel CVE team has assigned CVE-2025-21814 to this issue.


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

	Issue introduced in 3.0 with commit d94ba80ebbea17f036cecb104398fbcd788aa742 and fixed in 6.1.129 with commit 5d1041c76de656f9f8d5a192218039a9acf9bd00
	Issue introduced in 3.0 with commit d94ba80ebbea17f036cecb104398fbcd788aa742 and fixed in 6.6.78 with commit 81846070cba17125a866e8023c01d3465b153339
	Issue introduced in 3.0 with commit d94ba80ebbea17f036cecb104398fbcd788aa742 and fixed in 6.12.14 with commit 8441aea46445252df5d2eed6deb6d5246fc24002
	Issue introduced in 3.0 with commit d94ba80ebbea17f036cecb104398fbcd788aa742 and fixed in 6.13.3 with commit 755caf4ee1c615ee5717862e427124370f46b1f3
	Issue introduced in 3.0 with commit d94ba80ebbea17f036cecb104398fbcd788aa742 and fixed in 6.14-rc1 with commit fd53aa40e65f518453115b6f56183b0c201db26b

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-2025-21814
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/ptp/ptp_clock.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/5d1041c76de656f9f8d5a192218039a9acf9bd00
	https://git.kernel.org/stable/c/81846070cba17125a866e8023c01d3465b153339
	https://git.kernel.org/stable/c/8441aea46445252df5d2eed6deb6d5246fc24002
	https://git.kernel.org/stable/c/755caf4ee1c615ee5717862e427124370f46b1f3
	https://git.kernel.org/stable/c/fd53aa40e65f518453115b6f56183b0c201db26b