A new class of Microarchitectural Data Sampling (MDS) Vulnerabilities has been discovered, primarily affecting Intel CPUs, similar to the Spectre and Meltdown vulnerabilities. These are known by the aliases Zombieload, RIDL and Fallout. MDS is a hypothetical vulnerability that requires local privileged execution; as with Spectre and Meltdown, no known exploits using this method have yet been detected. Intel has released a Security Advisory on MDS, classifying it as a Medium risk. Microcode updates are being released as the primary mitigation; disabling HyperThreading is not necessary in most cases.
At this stage, current Intel CPUs are going to compete with the Intel 4004.