linux-cve-announce - CVE-2023-53403: time/debug: Fix memory leak with using debugfs

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Message-ID: <2025091800-CVE-2023-53403-a3a3@gregkh>
Date: Thu, 18 Sep 2025 15:59:00 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53403: time/debug: 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:

time/debug: 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-2023-53403 to this issue.


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

	Fixed in 5.15.99 with commit dc39fbd865a9819db4b622f610ba17b2ebc294f4
	Fixed in 6.1.16 with commit 15cffd01ed80e3506e29ba9f441e2358413b7317
	Fixed in 6.2.3 with commit b588b42d077ce93c98704b41003bcec6a564b738
	Fixed in 6.3 with commit 5b268d8abaec6cbd4bd70d062e769098d96670aa

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-2023-53403
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:
	kernel/time/test_udelay.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/dc39fbd865a9819db4b622f610ba17b2ebc294f4
	https://git.kernel.org/stable/c/15cffd01ed80e3506e29ba9f441e2358413b7317
	https://git.kernel.org/stable/c/b588b42d077ce93c98704b41003bcec6a564b738
	https://git.kernel.org/stable/c/5b268d8abaec6cbd4bd70d062e769098d96670aa