CentOS - Dec 2016 - centos-sclo-rh packages not signed?

Hi All,

I'm seeing this problem when running "yum update" on an otherwise
fully
patched CentOS 7.3 system.

Package libubsan-6.2.1-3.1.el7.x86_64.rpm is not signed

libubsan is from centos-sclo-rh.

I've done yum clean all multiple time. Didn't help.

-- 
Yan Li