Timing Attack Vulnerability in Linux Kernel IPv6 Implementation

CVE-2025-39702

What is CVE-2025-39702?

A vulnerability in the Linux kernel's IPv6 implementation has been identified that may expose systems to timing attacks. Specifically, the lack of constant-time comparison for Message Authentication Codes (MACs) can allow attackers to infer sensitive information through careful timing analysis. To mitigate this risk, it is essential to utilize appropriate helper functions for MAC comparison that ensure constant-time execution, thus fortifying the system against potential exploitation of this weakness. Users are advised to update to the latest version of the Linux kernel to benefit from security enhancements.

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