New Spectre-Style 'Pathfinder' Attack Targets Intel CPU, Leak Encryption Keys and Data

Researchers disclosed a set of novel side-channel techniques called "Pathfinder" that manipulate the CPU Path History Register and prediction history tables to reconstruct branch history and mount high-resolution Spectre-style attacks, demonstrated to extract AES encryption keys and leak secret images from libjpeg; Intel published an advisory after responsible disclosure and noted existing Spectre v1 mitigations reduce risk.