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
-3.0-sles11sp3.series 3.0.101-0.40
+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.series 3.10.0-693.11.6.el7 (RHEL 7.4)
+3.0-sles11sp3.series 3.0.101-0.47.71 (SLES11 SP3)
+3.0-sles11sp3.series 3.0.101-107 (SLES11 SP4)
+3.12-sles12.series 3.12.74-60.64.40 (SLES12 SP1)
+4.4-sles12.series 4.4.103-92.56 (SLES12 SP2)
+4.4-sles12sp3.series 4.4.103-6.38 (SLES12 SP3)
+4.4-ubuntu14+16.series 4.4.0-85.108 (Ubuntu 14.04.5 LTS)
+4.4-ubuntu14+16.series 4.4.0-85.108 (Ubuntu 16.04)
See lustre/ChangeLog for supported client kernel versions.