linux-cve-announce - CVE-2025-21822: ptp: vmclock: Set driver data before its usage

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Message-ID: <2025022707-CVE-2025-21822-88c0@gregkh>
Date: Thu, 27 Feb 2025 12:05:09 -0800
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2025-21822: ptp: vmclock: Set driver data before its usage

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

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

ptp: vmclock: Set driver data before its usage

If vmclock_ptp_register() fails during probing, vmclock_remove() is
called to clean up the ptp clock and misc device.
It uses dev_get_drvdata() to access the vmclock state.
However the driver data is not yet set at this point.

Assign the driver data earlier.

The Linux kernel CVE team has assigned CVE-2025-21822 to this issue.


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

	Issue introduced in 6.13 with commit 20503272422693d793b84f88bf23fe4e955d3a33 and fixed in 6.13.4 with commit 6dbd8b91a065d1d8001446a28e72cd140f9acef0
	Issue introduced in 6.13 with commit 20503272422693d793b84f88bf23fe4e955d3a33 and fixed in 6.14-rc3 with commit f7d07cd4f77d77f366c8ffbb8ba8b61f614e5fce

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-2025-21822
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_vmclock.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/6dbd8b91a065d1d8001446a28e72cd140f9acef0
	https://git.kernel.org/stable/c/f7d07cd4f77d77f366c8ffbb8ba8b61f614e5fce