Today yum told me there are updates
selinux-policy.noarch 3.7.19-155.el6_3.6 updates selinux-policy-targeted.noarch 3.7.19-155.el6_3.6 updates
I think it is this https://rhn.redhat.com/errata/RHBA-2012-1441.html
The CentOS announcement is missing.