The following updates has been released for CentOS:
CESA-2018:0008 Important CentOS 6 kernel Security UpdateKernel / Microcode / QEMU-KVM / Libvirt Updates for CentOS
CESA-2018:0013 Important CentOS 6 microcode_ctl Security Update
CESA-2018:0023 Important CentOS 7 qemu-kvm Security Update
CESA-2018:0029 Important CentOS 7 libvirt Security Update
CESA-2018:0030 Important CentOS 6 libvirt Security Update
CESA-RHSA-2018:0024 Important CentOS 6 qemu-kvm Security Update