Unprotected alternative channel of return branch target prediction in some Intel(R) Processors may allow an authorized user to potentially enable information disclosure via local access. https://www.intel.com/content/www/us/en/security-center/advisory/intel-sa-00707.html https://www.intel.com/content/www/us/en/developer/articles/technical/software-security-guidance/advisory-guidance/return-stack-buffer-underflow.html
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 2108584]
IIUC, this is a duplicate of BZ2090226.