Comment by jeffbee

The exploit provided in the article requires PMUs, i.e. hardware events, which are privileged. The PMU itself, at least the Intel one, is full of bugs and can be used to at least DoS the machine, at most take control of it. Letting anyone access the PMU is already a high-trust event, and I take a skeptical read on exploits that require the attacker to own the machine to start.