Linux Kernel up to 6.18-rc1 NFSD proc_layoutcommit denial of service

CVSS Meta Temp Score
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CTI Interest Score
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5.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18-rc1. It has been rated as critical. This affects the function proc_layoutcommit of the component NFSD. This manipulation causes denial of service. This vulnerability is tracked as CVE-2025-40087. No exploit exists. Upgrading the affected component is advised.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.18-rc1 and classified as critical. Affected by this vulnerability is the function proc_layoutcommit of the component NFSD. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. 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: Define a proc_layoutcommit for the FlexFiles layout type Avoid a crash if a pNFS client should happen to send a LAYOUTCOMMIT operation on a FlexFiles layout.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2025-40087 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 272051 (Linux Distros Unpatched Vulnerability : CVE-2025-40087), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 5.4.301, 5.10.246, 5.15.196, 6.1.158, 6.6.114, 6.12.55, 6.17.5 or 6.18-rc2 eliminates this vulnerability. Applying the patch a75994dd879401c3e24ff51c2536559f1a53ea27/34d187e020cbda112a6c6f094f0ca5e6a8672b75/ba88a53d7f5df4191583abf214214efe0cda91d2/da9129ef77786839a3ccd1d7afeeab790bceaa1d/f7353208c91ab004e0179c5fb6c365b0f132f9f0/a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4/785ec512afa80d0540f2ca797c0e56de747a6083/4b47a8601b71ad98833b447d465592d847b4dc77 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 (272051) and CERT Bund (WID-SEC-2025-2450). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Google Container-Optimized OS
  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Open Source Linux Kernel
  • Dell NetWorker

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.7
VulDB Meta Temp Score: 5.5

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

CVSSv2info

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

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 272051
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-40087

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 5.4.301/5.10.246/5.15.196/6.1.158/6.6.114/6.12.55/6.17.5/6.18-rc2
Patch: a75994dd879401c3e24ff51c2536559f1a53ea27/34d187e020cbda112a6c6f094f0ca5e6a8672b75/ba88a53d7f5df4191583abf214214efe0cda91d2/da9129ef77786839a3ccd1d7afeeab790bceaa1d/f7353208c91ab004e0179c5fb6c365b0f132f9f0/a156af6a4dc38c2aa7c98e89520a70fb3b3e7df4/785ec512afa80d0540f2ca797c0e56de747a6083/4b47a8601b71ad98833b447d465592d847b4dc77

Timelineinfo

04/16/2025 CVE reserved
10/30/2025 +197 days Advisory disclosed
10/30/2025 +0 days VulDB entry created
02/15/2026 +108 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-40087 (🔒)
GCVE (CVE): GCVE-0-2025-40087
GCVE (VulDB): GCVE-100-330547
CERT Bund: WID-SEC-2025-2450 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 10/30/2025 14:06
Updated: 02/15/2026 23:08
Changes: 10/30/2025 14:06 (59), 10/30/2025 16:20 (7), 11/01/2025 13:04 (2), 12/21/2025 22:58 (1), 02/15/2026 23:08 (1)
Complete: 🔍
Cache ID: 216::103

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