CentOS Errata and Enhancement Advisory 2015:1227 

Upstream details at : https://rhn.redhat.com/errata/RHEA-2015-1227.html

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

i386:
449d0c14dc46fd3cf4790d3c47b02ac95dd515def8b6a22ec95a4849f34cf117  kmod-mmc_block_dup-0.1_rh1-1.el6_6.i686.rpm

x86_64:
b308a68ac2ce6c6f5b563a98689b1371331c2af6b415d075fde4e8c580153b1a  kmod-mmc_block_dup-0.1_rh1-1.el6_6.x86_64.rpm

Source:
f116ed6a468c85a030569c62f58e81268b45536ebdc8665dc1850c1e3d11730c  mmc_block_dup-0.1_rh1-1.el6_6.src.rpm