Question

What do you mean by meltdown attack​

Answer 1

Overview. Meltdown exploits a race condition, inherent in the design of many modern CPUs. This occurs between memory access and privilege checking during instruction processing. ... The vulnerability allows an unauthorized process to read data from any address that is mapped to the current process's memory space.

Answer 2

Meltdown is a vulnerability allowing a process to read all memory in a given system. ... Spectre and Meltdown are representative examples of "transient execution" attacks, which rely on hardware design flaws in the implementation of speculative execution, instruction pipelining, and out-of-order execution in modern CPUs.