A qemu-kvm security update has been released for CentOS 6.

CentOS Errata and Security Advisory 2020:0775 Important

Upstream details at :   https://access.redhat.com/errata/RHSA-2020:0775

The following updated files have been uploaded and are currently
syncing to the mirrors: ( sha256sum Filename )

i386:
d0d628e01e9253fdf3f0b063ec84cfdff42b51524d6781dcaedcbf8c6d1bbaf7 qemu-guest-agent-0.12.1.2-2.506.el6_10.6.i686.rpm

x86_64:
1ff1b79f5fcc7f5434c6f96605e8f0ab35a57515b70a0f1c34cdc3819ad2b62f qemu-guest-agent-0.12.1.2-2.506.el6_10.6.x86_64.rpm
e1ec2dbb8cf9025c0a8841ff695edb293f3363b3e75a54ccb29ae45659cb35dc qemu-img-0.12.1.2-2.506.el6_10.6.x86_64.rpm
be1a8e676406bb39ee09b1c87b23291287154bf077f92317f2479cbdddd4cf44 qemu-kvm-0.12.1.2-2.506.el6_10.6.x86_64.rpm
7cbb3572d7582da02efd6bbe07655b254f279a26ce8a5efb38ae6352b3fb2a13 qemu-kvm-tools-0.12.1.2-2.506.el6_10.6.x86_64.rpm

Source:
fc9782f96408c4a58265cc040d6b2f7e22900326961e0cc0dfccb941f09cd904 qemu-kvm-0.12.1.2-2.506.el6_10.6.src.rpm