Null Pointer Dereference Vulnerability in Linux Kernel's f2fs File System

CVE-2025-40138

What is CVE-2025-40138?

A vulnerability exists in the f2fs (Flash-Friendly File System) component of the Linux kernel that leads to a null pointer dereference due to improper validation of pointers before comparison operations. Specifically, an inconsistency in the quota checks, triggered during remounting with user quota options, could result in unexpected crashes and potentially compromise system stability. To mitigate this, it is essential to ensure that all pointers are validated before any operations are performed. System administrators are advised to apply the latest kernel updates to address this issue.

References