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Vulnerability DatabaseCVE-2025-40087

CVE-2025-40087: 
Linux Kernel vulnerability analysis and mitigation

Overview

CVE-2025-40087 was disclosed on October 30, 2025, affecting the Linux kernel. The vulnerability relates to the NFSD (Network File System daemon) component, specifically involving the FlexFiles layout type. The issue was identified in various Linux distributions including Ubuntu and Debian systems (NVD Database, Debian Tracker).

Technical details

The vulnerability involves the absence of a proc_layoutcommit definition for the FlexFiles layout type in NFSD. This could result in a system crash if a pNFS (Parallel Network File System) client sends a LAYOUTCOMMIT operation on a FlexFiles layout (NVD Database).

Impact

The primary impact of this vulnerability is system stability, as it can cause a crash when specific NFS operations are performed. This affects systems running the vulnerable versions of the Linux kernel, particularly those using pNFS with FlexFiles layouts (NVD Database).

Mitigation and workarounds

The vulnerability has been addressed in various Linux distributions. Ubuntu has marked this as a medium priority issue and is working on updates for affected systems. Debian has identified the fix in version 6.17.7-2 and later releases (Ubuntu Security, Debian Tracker).

Additional resources

Source: This report was generated using AI

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