linux-cve-announce - CVE-2023-53390: drivers: base: dd: fix memory leak with using debugfs

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Message-ID: <2025091858-CVE-2023-53390-8eb5@gregkh>
Date: Thu, 18 Sep 2025 15:34:35 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53390: drivers: base: dd: 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:

drivers: base: dd: 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-2023-53390 to this issue.


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

	Fixed in 5.15.100 with commit 7f1e53f88e8babf293ec052b70aa9d2a3554360c
	Fixed in 6.1.18 with commit 5a7a9efdb193d3c8a35821548a8e99612c358828
	Fixed in 6.2.5 with commit 8e47e2bf78812adbd73c45c941d3c51add30b58d
	Fixed in 6.3 with commit 36c893d3a759ae7c91ee7d4871ebfc7504f08c40

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-2023-53390
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/base/dd.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/7f1e53f88e8babf293ec052b70aa9d2a3554360c
	https://git.kernel.org/stable/c/5a7a9efdb193d3c8a35821548a8e99612c358828
	https://git.kernel.org/stable/c/8e47e2bf78812adbd73c45c941d3c51add30b58d
	https://git.kernel.org/stable/c/36c893d3a759ae7c91ee7d4871ebfc7504f08c40