[1]https://thehackernews.com/2022/06/new-hertzbleed-side-channel-attack.html

   "A newly discovered security vulnerability in modern Intel and AMD
   processors could let remote attackers steal encryption keys via a power
   side channel attack.

   "Dubbed [2]Hertzbleed by a group of researchers from the University of
   Texas, University of Illinois Urbana-Champaign, and the University of
   Washington, the issue is rooted in dynamic voltage and frequency
   scaling ([3]DVFS), power and thermal management feature employed to
   conserve power and reduce the amount of heat generated by a chip.

   "The cause is that, under certain circumstances, periodic CPU frequency
   adjustments depend on the current CPU power consumption, and these
   adjustments directly translate to execution time differences (as 1
   hertz = 1 cycle per second)," the researchers said.

References

   1. https://thehackernews.com/2022/06/new-hertzbleed-side-channel-attack.html
   2. https://www.hertzbleed.com/
   3. https://en.wikipedia.org/wiki/Dynamic_frequency_scaling