cve 2025 40254

About this tag
CVE-2025-40254 is a Linux kernel vulnerability in the Open vSwitch (OVS) module, specifically affecting the set(nsh) action for Network Service Header (NSH) processing. The implementation was broken and never worked correctly, causing kernel crashes during validation. Rather than patching the flawed code, the Linux kernel developers removed the broken set(nsh) action entirely from stable kernels. This tag covers discussions about the vulnerability, its impact on OVS and software-defined networking, and the kernel's approach to removing non-functional features. It is relevant for Linux system administrators, network engineers, and security professionals managing OVS deployments.

  1. Linux Kernel OVS CVE-2025-40254: Removal of broken set(nsh) action

    The Linux kernel has just closed a long‑standing correctness hole in its Open vSwitch (OVS) code: CVE‑2025‑40254 addresses a broken implementation of the set(nsh(... action that never worked as intended, caused kernel crashes during validation, and has now been removed from stable kernels rather...
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