diff -up cobbler-2.6.8/koan/utils.py.centos cobbler-2.6.8/koan/utils.py
--- cobbler-2.6.8/koan/utils.py.centos	2015-05-08 19:25:57.530993499 -0600
+++ cobbler-2.6.8/koan/utils.py	2015-05-08 19:27:48.124509895 -0600
@@ -360,7 +360,9 @@ def os_release():
       tokens = rest.split(" ")
       for t in tokens:
          try:
-             return (make,float(t))
+             match = re.match('^\d+(?:\.\d+)?', t)
+             if match:
+                 return (make, float(match.group(0)))
          except ValueError, ve:
              pass
       raise CX("failed to detect local OS version from /etc/redhat-release")