The following updates has been released for CentOS 6:
CEBA-2019:1651 CentOS 6 kernel BugFix UpdateKernel, Microcode_CTL, Qemu-KVM, LibSSH2 for CentOS 6
CEEA-2019:1653 CentOS 6 microcode_ctl Enhancement Update
CESA-2019:1650 Low CentOS 6 qemu-kvm Security Update
CESA-2019:1652 Important CentOS 6 libssh2 Security Update