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 2.6.32-573.18.1.el6 (RHEL 6.7)
-3.10-rhel7.series 3.10.0-327.10.1.el7 (RHEL 7.2)
+3.10-rhel7.5.series 3.10.0-862.14.4.el7 (RHEL 7.5)
+3.10-rhel7.6.series 3.10.0-957.27.2.el7 (RHEL 7.6)
+3.10-rhel7.7.series 3.10.0-1062.1.1.el7 (RHEL 7.7)
+4.18-rhel8.series 4.18.0-80.7.1.el8 (RHEL 8.0)
3.0-sles11sp3.series 3.0.101-0.47.71 (SLES11 SP3)
-3.0-sles11sp3.series 3.0.101-68 (SLES11 SP4)
-3.12-sles12.series 3.12.53-60.30 (SLES12 SP1)
+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 4.4.120-92.70 (SLES12 SP2)
+4.4-sles12sp3.series 4.4.180-94.100 (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.