Oracle Linux 7 Update 6 is shipping with the below kernels:
Unbreakable Enterprise Kernel (UEK) Release 5 (4.14.35-1818.3.3) for x86-64 and ARM
Red Hat Compatible Kernel (3.10.0-957) for x86-64 only
Note: Unbreakable Enterprise Kernel (UEK) Release 5 is newest major version of UEK by Oracle and not a release of Linux Kernel, this kernel is based on the mainline Linux kernel version 4.14.35. Supporting 64-bit ARM (aarch64) architecture has been introduced with this version of UEK.