>>8952
It's not equivalent to ME/PSP, which is why I bought an ARM system. :-)
Some ARM processors are vulnerable to Spectre class attacks, and others that exploit the speculative execution nature of the affected processors. Most newer ARM Cortex-A series are speculative, in fact, which is why I avoid them. But Cortex-A7 and Cortex-A53 simply do linear fetch/decode/execute, without any kind of speculation.
That's not to say there can't be other CPU bugs, but I'm not aware of any major processor exploits for those two (A7 and A53) or older ones like ARM7 & ARM9 (but those ones are much less powerful).
And of course, other components can be attacked, like for example as Rowhammer does the DDR3/DDR4 memory. I thought about buying an old board Olimex sells that has non-vulnerable DDR2 memory, but it's a pretty big drop in performance from my 1 GHz dual core Cortex-A7 to that board's ARM926J clocked at 454 MHz, and since it only has 64 MB RAM the board can only run very old kernels specifically built for embedded Linux (and forget about OpenBSD, they just don't support it at all!)