CentOS Errata and Bugfix Advisory 2015:0123 

Upstream details at : https://rhn.redhat.com/errata/RHBA-2015-0123.html

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

i386:
2c2e39e0ba36026de247eedaa5a733f27403600578a6330da9f7c1180c5fec19  xorg-x11-server-common-1.15.0-25.1.el6.centos.i686.rpm
81080ae713a1acd0ea30d84be54b04dba632c231399357d935bad3d591b73957  xorg-x11-server-devel-1.15.0-25.1.el6.centos.i686.rpm
b4014fd130801be327a405a7d7bcce8e2448546daa8a9244171194a40f4d1ef4  xorg-x11-server-source-1.15.0-25.1.el6.centos.noarch.rpm
8322884a868f43d2c213987a6df3f3e4437440a2602d9f1c81b34b48c94aeb9a  xorg-x11-server-Xdmx-1.15.0-25.1.el6.centos.i686.rpm
e5cd7b182deb9e54ac4f580ad009baa48b6959f230caa18dd78cf574c3f854be  xorg-x11-server-Xephyr-1.15.0-25.1.el6.centos.i686.rpm
93148cb5b77194501ba3ea7f915c40c1e529f2c3ba391c8dd7fb4987bb17a7b6  xorg-x11-server-Xnest-1.15.0-25.1.el6.centos.i686.rpm
58c14d3273d8edc6d5c215b1fc519064750a48181c413c7e4e1cee415c4b56aa  xorg-x11-server-Xorg-1.15.0-25.1.el6.centos.i686.rpm
8b1583b961d2e31f720b7674883187c602e46fa8d4429557f14eac0dc463464c  xorg-x11-server-Xvfb-1.15.0-25.1.el6.centos.i686.rpm

x86_64:
da6cb1aadca9ac7539113bcc892011e7aec0902b4c81ab350eb6754855b354b7  xorg-x11-server-common-1.15.0-25.1.el6.centos.x86_64.rpm
81080ae713a1acd0ea30d84be54b04dba632c231399357d935bad3d591b73957  xorg-x11-server-devel-1.15.0-25.1.el6.centos.i686.rpm
6adf16b9a2cc397fc54bab110093f1591bc02586c196de8b4b7c9fbd94bcce65  xorg-x11-server-devel-1.15.0-25.1.el6.centos.x86_64.rpm
b4014fd130801be327a405a7d7bcce8e2448546daa8a9244171194a40f4d1ef4  xorg-x11-server-source-1.15.0-25.1.el6.centos.noarch.rpm
aac00cfabe20cadf545cc9218f97b990e175ba2ded7928b4078a0e5755f30e8b  xorg-x11-server-Xdmx-1.15.0-25.1.el6.centos.x86_64.rpm
c7515cf4862ca3d74df10cb2e8c63449295920f85f6d74e00d3c475ce80e7242  xorg-x11-server-Xephyr-1.15.0-25.1.el6.centos.x86_64.rpm
88efbb1cd6d3cd08c363703c46486b158e4d0046ff04eb09e622edfbb1a91bf4  xorg-x11-server-Xnest-1.15.0-25.1.el6.centos.x86_64.rpm
0651a9d480cc2a883183892165b66a06d648490fa00d29a2306239d9457b6c13  xorg-x11-server-Xorg-1.15.0-25.1.el6.centos.x86_64.rpm
9379a70a17375b21779f28036a4a138dcbf30eb652c63399a3672a65dac4080b  xorg-x11-server-Xvfb-1.15.0-25.1.el6.centos.x86_64.rpm

Source:
9cc1156ecd7ce73b45b49aa8c0c28a13b5f4f33ce67e3ebc1cf4d552ccc13f8d  xorg-x11-server-1.15.0-25.1.el6.centos.src.rpm