Observable response discrepancy 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-00516.html
https://www.debian.org/security/2021/dsa-4931
https://security.gentoo.org/glsa/202107-30
http://www.openwall.com/lists/oss-security/2021/06/10/11