linux-cve-announce - CVE-2025-68311: tty: serial: ip22zilog: Use platform device for probing

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Message-ID: <2025121654-CVE-2025-68311-c43d@gregkh>
Date: Tue, 16 Dec 2025 16:39:54 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2025-68311: tty: serial: ip22zilog: Use platform device for probing

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

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

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

tty: serial: ip22zilog: Use platform device for probing

After commit 84a9582fd203 ("serial: core: Start managing serial controllers
to enable runtime PM") serial drivers need to provide a device in
struct uart_port.dev otherwise an oops happens. To fix this issue
for ip22zilog driver switch driver to a platform driver and setup
the serial device in sgi-ip22 code.

The Linux kernel CVE team has assigned CVE-2025-68311 to this issue.


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

	Fixed in 6.12.58 with commit 460e0dc9af2d7790d5194c6743d79f9b77b58836
	Fixed in 6.17.8 with commit 77a196ca904d66c8372aa8fbfc1c4ae3a66dee2e
	Fixed in 6.18 with commit 3fc36ae6abd263a5cbf93b2f5539eccc1fc753f7

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-2025-68311
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:
	arch/mips/sgi-ip22/ip22-platform.c
	drivers/tty/serial/ip22zilog.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/460e0dc9af2d7790d5194c6743d79f9b77b58836
	https://git.kernel.org/stable/c/77a196ca904d66c8372aa8fbfc1c4ae3a66dee2e
	https://git.kernel.org/stable/c/3fc36ae6abd263a5cbf93b2f5539eccc1fc753f7