ARM is more less examined than less vulnerable. Most of their cores aren't speculative execution out-of-order, that's expensive in power and silicon real estate/cost, but they have 13 vulnerable to Spectre, including 1 known for the 2018 Rogue System Register Read which like this latest set for Intel is design specific. It would be wise to assume there are more vulnerabilities hiding, the name Spectre was chosen because we'll be haunted by it for a long time. Also one of their newest designs is vulnerable to Meltdown, see the whole list here: https://developer.arm.com/support/arm-security-updates/specu...