linux-cve-announce - CVE-2023-53551: usb: gadget: u_serial: Add null pointer check in gserial

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Message-ID: <2025100447-CVE-2023-53551-4afc@gregkh>
Date: Sat,  4 Oct 2025 17:17:05 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53551: usb: gadget: u_serial: Add null pointer check in gserial_resume

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

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

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

usb: gadget: u_serial: Add null pointer check in gserial_resume

Consider a case where gserial_disconnect has already cleared
gser->ioport. And if a wakeup interrupt triggers afterwards,
gserial_resume gets called, which will lead to accessing of
gser->ioport and thus causing null pointer dereference.Add
a null pointer check to prevent this.

Added a static spinlock to prevent gser->ioport from becoming
null after the newly added check.

The Linux kernel CVE team has assigned CVE-2023-53551 to this issue.


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

	Issue introduced in 5.8 with commit aba3a8d01d623a5efef48ab8e78752d58d4c90c3 and fixed in 5.10.171 with commit c5360eec648bd506afa304ae4a71f82e13d41897
	Issue introduced in 5.8 with commit aba3a8d01d623a5efef48ab8e78752d58d4c90c3 and fixed in 5.15.97 with commit 3b24c980dc07be4550a9d1450ed7057f882530e5
	Issue introduced in 5.8 with commit aba3a8d01d623a5efef48ab8e78752d58d4c90c3 and fixed in 6.1.15 with commit ec357cd3e8af614855d286dd378725cdc7264df6
	Issue introduced in 5.8 with commit aba3a8d01d623a5efef48ab8e78752d58d4c90c3 and fixed in 6.2.2 with commit 44e004f757a7ae13dfebaadbcfdb1a6f98c10377
	Issue introduced in 5.8 with commit aba3a8d01d623a5efef48ab8e78752d58d4c90c3 and fixed in 6.3 with commit 5ec63fdbca604568890c577753c6f66c5b3ef0b5

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-2023-53551
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/usb/gadget/function/u_serial.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/c5360eec648bd506afa304ae4a71f82e13d41897
	https://git.kernel.org/stable/c/3b24c980dc07be4550a9d1450ed7057f882530e5
	https://git.kernel.org/stable/c/ec357cd3e8af614855d286dd378725cdc7264df6
	https://git.kernel.org/stable/c/44e004f757a7ae13dfebaadbcfdb1a6f98c10377
	https://git.kernel.org/stable/c/5ec63fdbca604568890c577753c6f66c5b3ef0b5