Meltdown

Meltdown is one of the two original transient execution CPU vulnerabilities (the other being Spectre). Meltdown affects Intel x86 microprocessors, IBM POWER processors, and some ARM-based microprocessors. It allows a rogue process to read all memory, even when it is not authorized to do so. Meltdown (security vulnerability)

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Spectre

... original transient execution CPU vulnerabilities (Meltdown), which involve microarchitectural timing side-channel ...

Meltdown and Spectre

- Meltdown bypasses memory protection between user ...