linux-cve-announce - CVE-2023-53173: tty: pcn_uart: fix memory leak with using debugfs

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Message-ID: <2025091555-CVE-2023-53173-4180@gregkh>
Date: Mon, 15 Sep 2025 16:02:27 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53173: tty: pcn_uart: fix memory leak with using debugfs_lookup()

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

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

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

tty: pcn_uart: fix memory leak with using debugfs_lookup()

When calling debugfs_lookup() the result must have dput() called on it,
otherwise the memory will leak over time.  To make things simpler, just
call debugfs_lookup_and_remove() instead which handles all of the logic
at once.

The Linux kernel CVE team has assigned CVE-2023-53173 to this issue.


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

	Fixed in 5.15.100 with commit cf042964c2fa72950bbbf25b2cdd732b873e89db
	Fixed in 6.1.18 with commit 4459d1e7bd0421b3b6fcd745773d8823f71615ef
	Fixed in 6.2.5 with commit 139769c4bd8273b5e3f85ea474aa37018fe7e436
	Fixed in 6.3 with commit 04a189c720aa2b6091442113ce9b9bc93552dff8

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-2023-53173
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/pch_uart.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/cf042964c2fa72950bbbf25b2cdd732b873e89db
	https://git.kernel.org/stable/c/4459d1e7bd0421b3b6fcd745773d8823f71615ef
	https://git.kernel.org/stable/c/139769c4bd8273b5e3f85ea474aa37018fe7e436
	https://git.kernel.org/stable/c/04a189c720aa2b6091442113ce9b9bc93552dff8