What you need to know about Speculative Store Bypass, the Spectre-like 'Variant 4' CPU flaw

The ghosts of the Meltdown and Spectre will haunt the computing industry for years to come. But now that the initial patching efforts for those CPU flaws are drawing to an end, Google and Microsoft have disclosed a related "speculative execution" attack dubbed Speculative Store Bypass, or simply Variant 4. (Meltdown and the two Spectre flaws were the first three variants.) Don't panic though. Let's start with the bad news: Speculative Store Bypass affects Intel, AMD, and ARM chips, meaning mobil...