Unbreakable Enterprise Kernel Release 6 (UEK R6) is a heavily tested and optimized operating system kernel for Oracle Linux 7.7 and later and for Oracle Linux 8.1 and later. The kernel is developed, built, and tested on Arm (aarch64) Intel x86 and AMD x86 (x86_64). platforms. It is based on the mainline Linux kernel version 5.4. This release also updates drivers and includes bug and security fixes.

Oracle actively monitors upstream check-ins and applies critical bug and security fixes to UEK R6.

UEK R6 is initially released with the 5.4.17-2011 version and build of the kernel.

UEK R6 uses the same versioning model as the mainline Linux kernel version. It is possible that some applications might not understand the 5.4 versioning scheme. However, regular Linux applications are usually neither aware of nor affected by Linux kernel version numbers.

UEK R6 maintains compatibility with the Red Hat Compatible Kernel (RHCK) and does not disable any features that are enabled in RHCK. Additional features are enabled to provide support for key functional requirements and patches are applied to improve performance and optimize the kernel for use on Oracle operating environments.

The kernel's source code is available through a public git source code repository at https://github.com/oracle/linux-uek.