"MDS Attacks: Microarchitectural Data Sampling" https://mdsattacks.com/
importantly, our research shows that what last year appeared to be exceptional one-time speculative execution bugs are actually systemic, and the problems in modern CPUs may go much deeper than we initially thought. If CPUs have become so complex that chip vendors cannot keep their security under control, hardware vulnerabilities will be the new hunting ground for sophisticated attackers. And we may have no idea how many zero-day hardware vulnerabilities are still up for grabs. If we can no longer trust our hardware, the foundation on which we build all security solutions is crumbling away."