This update for libvirt fixes the following issues: Four new speculative execution information leak issu Store Buffer Data Sampling - CVE-2018-12127: Microarchitectural Fill Buffer Data Sampling - CVE-2018-12130: Microarchitectural Load Port Data Sampling - CVE-2019-11091: Microarchitectural Data Sampling Uncacheable Memory These updates contain the libvirt adjustments, that pass through the new "md-clear" CPU flag . For more information on this set of vulnerabilities, check out https://www.suse.com/support/kb/doc/?id=7023736