Canonical has published a new security advisory today where the company behind the popular Ubuntu Linux operating system apologizes for a regression introduced by the latest Intel microcode firmware update. On November 12th, 2019, Canonical published important kernel security updates for all supported Ubuntu Linux releases to address two flaws (CVE-2019-11135 and CVE-2019-11139) discovered by various security researchers in Intel processors using Transactional Synchronization Extensions (TSX), as well as on certain Intel Xeon processors.
[Source: Softpedia The new Intel microcode update is already available in the main software repositories]