Foreshadow: a new speculative execution vulnerability.
A new speculative execution issue has been identified in Intel central processing units. The flaws, collectively called "Foreshadow," join the well-known family of Spectre and Meltdown. Foreshadow is in the process of being mitigated. There's so far no known instance of Foreshadow exploitation in the wild, and it seems unlikely that hackers could easily make use of it to attack systems (Bleeping Computer).