Kernel Vulnerability in Open vSwitch Affecting Linux Kernel Systems
CVE-2025-40254

Currently unrated

Key Information:

Vendor: Linux
Status: Linux
Vendor: CVE Published:; 4 December 2025

What is CVE-2025-40254?

A critical issue has been identified in the Open vSwitch component of the Linux kernel, where improper validation related to the nesting of NSH attributes can lead to kernel crashes. The validation logic for setting NSH fields is flawed due to a misunderstanding of memory layouts, resulting in potential NULL pointer dereferences during operations. The incorrect handling of masked and non-masked attributes compounds this vulnerability, leading to unstable kernel behavior. All attempts to utilize this functionality can result in either validation failures or system crashes, which necessitates its removal from the codebase to prevent exploitation. Future implementations should aim to correctly address these fundamental issues for safer network management.

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