linux-cve-announce - CVE-2023-53381: NFSD: fix leaked reference count of nfsd4_ssc_umount

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Message-ID: <2025091856-CVE-2023-53381-a774@gregkh>
Date: Thu, 18 Sep 2025 15:34:26 +0200
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-cve-announce@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...nel.org>
Subject: CVE-2023-53381: NFSD: fix leaked reference count of nfsd4_ssc_umount_item

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

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

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

NFSD: fix leaked reference count of nfsd4_ssc_umount_item

The reference count of nfsd4_ssc_umount_item is not decremented
on error conditions. This prevents the laundromat from unmounting
the vfsmount of the source file.

This patch decrements the reference count of nfsd4_ssc_umount_item
on error.

The Linux kernel CVE team has assigned CVE-2023-53381 to this issue.


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

	Issue introduced in 5.14 with commit f4e44b393389c77958f7c58bf4415032b4cda15b and fixed in 5.15.154 with commit 80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0
	Issue introduced in 5.14 with commit f4e44b393389c77958f7c58bf4415032b4cda15b and fixed in 6.1.16 with commit 9f0df37520a27ad99eaacf38418b3d2bb5023105
	Issue introduced in 5.14 with commit f4e44b393389c77958f7c58bf4415032b4cda15b and fixed in 6.2.3 with commit 6c3c05402547aaca3edb23327b50f01a881831b9
	Issue introduced in 5.14 with commit f4e44b393389c77958f7c58bf4415032b4cda15b and fixed in 6.3 with commit 34e8f9ec4c9ac235f917747b23a200a5e0ec857b

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-2023-53381
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:
	fs/nfsd/nfs4proc.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/2da50149981d05955e51c28e982e9ac29bd73417
	https://git.kernel.org/stable/c/80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0
	https://git.kernel.org/stable/c/9f0df37520a27ad99eaacf38418b3d2bb5023105
	https://git.kernel.org/stable/c/6c3c05402547aaca3edb23327b50f01a881831b9
	https://git.kernel.org/stable/c/34e8f9ec4c9ac235f917747b23a200a5e0ec857b