linux-cve-announce - CVE-2023-53402: kernel/printk/index.c: fix memory leak with using debugfs

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Message-ID: <2025091800-CVE-2023-53402-4b40@gregkh>
Date: Thu, 18 Sep 2025 15:58:59 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53402: kernel/printk/index.c: 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:

kernel/printk/index.c: 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-2023-53402 to this issue.


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

	Fixed in 5.15.100 with commit 2e07fa2e30d48d24a791483774a3d4b76769e0cf
	Fixed in 6.1.18 with commit c578a68ffcdc2e8c72556bebdaae2b7500398e81
	Fixed in 6.2.5 with commit 13969236b6900b5a3625ad2193569588e978f1cc
	Fixed in 6.3 with commit 55bf243c514553e907efcf2bda92ba090eca8c64

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-2023-53402
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/printk/index.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/2e07fa2e30d48d24a791483774a3d4b76769e0cf
	https://git.kernel.org/stable/c/c578a68ffcdc2e8c72556bebdaae2b7500398e81
	https://git.kernel.org/stable/c/13969236b6900b5a3625ad2193569588e978f1cc
	https://git.kernel.org/stable/c/55bf243c514553e907efcf2bda92ba090eca8c64