linux-cve-announce - CVE-2023-52936: kernel/irq/irqdomain.c: fix memory leak with using debugfs

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Message-ID: <2025032721-CVE-2023-52936-d459@gregkh>
Date: Thu, 27 Mar 2025 17:37:26 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: CVE-2023-52936: kernel/irq/irqdomain.c: fix memory leak with using debugfs_lookup()

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

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

kernel/irq/irqdomain.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-2023-52936 to this issue.


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

	Fixed in 5.15.93 with commit 066ecbf1a53eb0b92b10c8df7808666be6ea5681
	Fixed in 6.1.11 with commit cf1c917bf1c761a557b26410024e90057646c049
	Fixed in 6.2 with commit d83d7ed260283560700d4034a80baad46620481b

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-2023-52936
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/irq/irqdomain.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/066ecbf1a53eb0b92b10c8df7808666be6ea5681
	https://git.kernel.org/stable/c/cf1c917bf1c761a557b26410024e90057646c049
	https://git.kernel.org/stable/c/d83d7ed260283560700d4034a80baad46620481b