linux-cve-announce - CVE-2025-38054: ptp: ocp: Limit signal/freq counts in summary output functions

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Message-ID: <2025061832-CVE-2025-38054-4ba3@gregkh>
Date: Wed, 18 Jun 2025 11:33:49 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-38054: ptp: ocp: Limit signal/freq counts in summary output functions

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

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

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

ptp: ocp: Limit signal/freq counts in summary output functions

The debugfs summary output could access uninitialized elements in
the freq_in[] and signal_out[] arrays, causing NULL pointer
dereferences and triggering a kernel Oops (page_fault_oops).
This patch adds u8 fields (nr_freq_in, nr_signal_out) to track the
number of initialized elements, with a maximum of 4 per array.
The summary output functions are updated to respect these limits,
preventing out-of-bounds access and ensuring safe array handling.

Widen the label variables because the change confuses GCC about
max length of the strings.

The Linux kernel CVE team has assigned CVE-2025-38054 to this issue.


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

	Issue introduced in 6.9 with commit ef61f5528fca6c3bbb2f8bc002fd1949c9d1f9b9 and fixed in 6.12.31 with commit 0b7d3e782027ac3b6fec56159e8e348042000aef
	Issue introduced in 6.9 with commit ef61f5528fca6c3bbb2f8bc002fd1949c9d1f9b9 and fixed in 6.14.9 with commit fcad74f894ac89790084cc2e1ec61b08220941d1
	Issue introduced in 6.9 with commit ef61f5528fca6c3bbb2f8bc002fd1949c9d1f9b9 and fixed in 6.15 with commit c9e455581e2ba87ee38c126e8dc49a424b9df0cf

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-2025-38054
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_ocp.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/0b7d3e782027ac3b6fec56159e8e348042000aef
	https://git.kernel.org/stable/c/fcad74f894ac89790084cc2e1ec61b08220941d1
	https://git.kernel.org/stable/c/c9e455581e2ba87ee38c126e8dc49a424b9df0cf