The following updates has been released for CentOS:
CEEA-2018:2397 CentOS 7 microcode_ctl Enhancement UpdateFirefox and Microcode_CTL Updates for CentOS 6 and 7
CEEA-2018:2675 CentOS 6 microcode_ctl Enhancement Update
CESA-2018:2692 Critical CentOS 7 firefox Security Update
CESA-2018:2693 Critical CentOS 6 firefox Security Update