You can check the KernelCare version by using the following command kcarectl --info.
Example output:
kpatch-state: patch is applied
kpatch-for: Linux version 2.6.32-431.29.2.el6.x86_64 (mockbuild@c6b9.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-4) (GCC) ) #1 SMP Tue Sep 9 21:36:05 UTC 2014
kpatch-build-time: Sat Oct 18 22:57:27 2014
kpatch-description: 6;2.6.32-504.el6.x86_64