linux-cve-announce - CVE-2023-54118: serial: sc16is7xx: setup GPIO controller later in probe

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Message-ID: <2025122415-CVE-2023-54118-d92b@gregkh>
Date: Wed, 24 Dec 2025 14:07:15 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-54118: serial: sc16is7xx: setup GPIO controller later in probe

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

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

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

serial: sc16is7xx: setup GPIO controller later in probe

The GPIO controller component of the sc16is7xx driver is setup too
early, which can result in a race condition where another device tries
to utilise the GPIO lines before the sc16is7xx device has finished
initialising.

This issue manifests itself as an Oops when the GPIO lines are configured:

    Unable to handle kernel read from unreadable memory at virtual address
    ...
    pc : sc16is7xx_gpio_direction_output+0x68/0x108 [sc16is7xx]
    lr : sc16is7xx_gpio_direction_output+0x4c/0x108 [sc16is7xx]
    ...
    Call trace:
    sc16is7xx_gpio_direction_output+0x68/0x108 [sc16is7xx]
    gpiod_direction_output_raw_commit+0x64/0x318
    gpiod_direction_output+0xb0/0x170
    create_gpio_led+0xec/0x198
    gpio_led_probe+0x16c/0x4f0
    platform_drv_probe+0x5c/0xb0
    really_probe+0xe8/0x448
    driver_probe_device+0xe8/0x138
    __device_attach_driver+0x94/0x118
    bus_for_each_drv+0x8c/0xe0
    __device_attach+0x100/0x1b8
    device_initial_probe+0x28/0x38
    bus_probe_device+0xa4/0xb0
    deferred_probe_work_func+0x90/0xe0
    process_one_work+0x1c4/0x480
    worker_thread+0x54/0x430
    kthread+0x138/0x150
    ret_from_fork+0x10/0x1c

This patch moves the setup of the GPIO controller functions to later in the
probe function, ensuring the sc16is7xx device has already finished
initialising by the time other devices try to make use of the GPIO lines.
The error handling has also been reordered to reflect the new
initialisation order.

The Linux kernel CVE team has assigned CVE-2023-54118 to this issue.


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

	Fixed in 5.10.173 with commit 17b96b5c19bec791b433890549e44ca523dc82aa
	Fixed in 5.15.100 with commit 49b326ce8a686428d8cbb82ed74fc88ed3f95a51
	Fixed in 6.1.18 with commit f57c2164d082a36d177ab7fbf54c18970df89c22
	Fixed in 6.2.5 with commit b71ff206707855ce73c04794c76f7b678b2d4f72
	Fixed in 6.3 with commit c8f71b49ee4d28930c4a6798d1969fa91dc4ef3e

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-2023-54118
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/tty/serial/sc16is7xx.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/17b96b5c19bec791b433890549e44ca523dc82aa
	https://git.kernel.org/stable/c/49b326ce8a686428d8cbb82ed74fc88ed3f95a51
	https://git.kernel.org/stable/c/f57c2164d082a36d177ab7fbf54c18970df89c22
	https://git.kernel.org/stable/c/b71ff206707855ce73c04794c76f7b678b2d4f72
	https://git.kernel.org/stable/c/c8f71b49ee4d28930c4a6798d1969fa91dc4ef3e