https://www.theregister.co.uk/2018/01/02/intel_cpu_design_flaw/

In a nutshell, it is a major security flaw in Intel hardware dating back a decade that is requiring a complete kernel rewrite for every major OS (Linux, Windows, Mac, etc) in order to patch out. It cannot be patched out with a CPU microcode update. Major enough that code comments are redacted in the patches until an embargo period is expired. Also the reported fix will have a huge performance impact.

Also crucial to note is that AMD chips are not affected by this.

How the heck does something like this go unnoticed for so long?

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