Even a low-power core like a Cortex-M7 can do some speculative execution through its branch predictor. Though of course a M7 isn't running VMs, and probably is

Even a low-power core like a Cortex-M7 can do some speculative execution through its branch predictor. Though of course a M7 isn't running VMs, and probably isn't running any kind of attacker-controlled code (scripting included - its there, but rare), so many of the vectors aren't present.