Clients since 2.6.18 DO NOT need any patches.
PATCH SERIES FOR SERVER KERNELS:
-2.6-rhel6.series 2.6.32-431.29.2.el6 (RHEL 6.5)
-2.6-rhel6.series 2.6.32-504.30.3.el6 (RHEL 6.6)
-2.6-rhel6.series 2.6.32-573.26.1.el6 (RHEL 6.7)
-2.6-rhel6.8.series 2.6.32-642.15.1.el6 (RHEL 6.8)
-2.6-rhel6.8.series 2.6.32-696.18.7.el6 (RHEL 6.9)
3.10-rhel7.5.series 3.10.0-862.14.4.el7 (RHEL 7.5)
3.10-rhel7.6.series 3.10.0-957.21.3.el7 (RHEL 7.6)
3.0-sles11sp3.series 3.0.101-0.47.71 (SLES11 SP3)