Modern Intel, AMD, and ARM processors translate the common assembly instructions into simpler internal micro-ops that are then cached on-chip structure called a micro-op cache. The "dead uOps" paper outlines possible attacks that exploit the micro-op cache as a timing channel to transmit secret information.
Mitigation for this issue is either not available or the currently available options does not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1957711]