Yesterday the latest Spectre vulnerability was disclosed as Spectre Variant 4 also known as "Speculative Store Bypass" as well as the less talked about Spectre Variant 3A "Rogue System Register Read". Here are my initial tests of a patched Linux kernel on AMD hardware for Spectre V4."

When it comes to the Intel/AMD CPUs, that is squared away in Linux 4.17 although we expect the support will continue to be refined over the weeks/months ahead just as the earlier Spectre and Meltdown mitigation work continues to be improved upon, particularly for performance efficiencies. The initial x86 mitigation work has already premiered today in new 4.9/4.14/4.16 kernel point releases.