Linux Kernel up to 5.15.153/6.1.15/6.2.2 NFSD nfsd4_ssc_umount_item reference count

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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 5.15.153/6.1.15/6.2.2. It has been classified as critical. The affected element is the function nfsd4_ssc_umount_item of the component NFSD. This manipulation causes reference count. This vulnerability is tracked as CVE-2023-53381. No exploit exists. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel up to 5.15.153/6.1.15/6.2.2. Affected by this vulnerability is the function nfsd4_ssc_umount_item of the component NFSD. The manipulation with an unknown input leads to a reference count vulnerability. The CWE definition for the vulnerability is CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2023-53381 since 09/17/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 265560 (Linux Distros Unpatched Vulnerability : CVE-2023-53381), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.15.154, 6.1.16 or 6.2.3 eliminates this vulnerability. Applying the patch 2da50149981d05955e51c28e982e9ac29bd73417/80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0/9f0df37520a27ad99eaacf38418b3d2bb5023105/6c3c05402547aaca3edb23327b50f01a881831b9/34e8f9ec4c9ac235f917747b23a200a5e0ec857b is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265560) and CERT Bund (WID-SEC-2025-2092). Be aware that VulDB is the high quality source for vulnerability data.

Affected

  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Dell Secure Connect Gateway
  • IBM QRadar SIEM

Productinfo

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Version

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Reference count
CWE: CWE-911 / CWE-664
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265560
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2023-53381

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.15.154/6.1.16/6.2.3
Patch: 2da50149981d05955e51c28e982e9ac29bd73417/80a15dc4a0214b55ca42675bb0bb2a8d857eb1d0/9f0df37520a27ad99eaacf38418b3d2bb5023105/6c3c05402547aaca3edb23327b50f01a881831b9/34e8f9ec4c9ac235f917747b23a200a5e0ec857b

Timelineinfo

09/17/2025 CVE reserved
09/18/2025 +1 days Advisory disclosed
09/18/2025 +0 days VulDB entry created
12/11/2025 +84 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-53381 (🔒)
GCVE (CVE): GCVE-0-2023-53381
GCVE (VulDB): GCVE-100-324847
CERT Bund: WID-SEC-2025-2092 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 09/18/2025 16:22
Updated: 12/11/2025 21:47
Changes: 09/18/2025 16:22 (59), 09/20/2025 04:02 (7), 09/20/2025 22:46 (2), 11/29/2025 16:14 (1), 12/11/2025 21:47 (10)
Complete: 🔍
Cache ID: 216::103

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