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Announcing the general availability of the Unbreakable Enterprise Kernel Release 5 Update 1

Avi Miller
Senior Solutions Architect

The Oracle Linux operating system is engineered for an open cloud infrastructure. It delivers leading performance, scalability and reliability for enterprise SaaS and PaaS workloads as well as traditional enterprise applications. Oracle Linux Support offers access to award-winning Oracle support resources and Linux support specialists; zero-downtime updates using Ksplice; additional management tools such as Oracle Enterprise Manager and Spacewalk; and lifetime support, all at a low cost. And unlike many other commercial Linux distributions, Oracle Linux is easy to download, completely free to use, distribute, and update.

What's New?

The Unbreakable Enterprise Kernel Release (UEK) 5 Update 1 is based on the mainline kernel version 4.14.35 and includes several new features, added functionality and bug fixes across a range of subsystems.

Notable changes

  • Improved support for 64-bit Arm (aarch64) architecture. Oracle continues to deliver kernel modifications to improve support for 64-bit Arm (aarch64) architecture. These changes are built and tested against existing Arm hardware and provide support for Oracle Linux for Arm.
  • Cgroup v2 CPU controller backported to support kABI. The update includes changes to the code that handles cgroup resource usage statistics and improves performance when handling frequent reads where there are many cgroups that are not active.
  • Improved scheduler scalability for fast path. This release includes scheduler scalability improvements for fast path. In addition, a new scheduler feature, SIS_CORE, is introduced to improve performance for certain workloads such as Oracle Database OLTP.
  • DTrace has been enhanced to include additional runtime options on both the x86_64 and Arm architectures. In addition, DTrace has been enhanced to include the implementation of ustack() along with the implementation of SDT probes, FBT entry probes, and FBT return probes on the Arm architecture.
  • libnvdimm subsystem updated for PMEM and DAX. The libnvdimm kernel subsystem, which is responsible for the detection, configuration, and management of Non-Volatile Dual Inline Memory Modules (NVDIMMs) is updated in UEK R5U1 to take advantage a large number of upstream patches, bug fixes and backports. Notably, these include fixes to /proc/smaps to reflect the actual PMEM page size and some work to improve Address Range Scrub (ARS). Also included is support for direct access (DAX) page operations on Non-Volatile Dual Inline Memory Modules (NVDIMMs) using either the ext4 or XFS file systems.

For more details on these and other new features and changes, please consult the Release Notes for the Unbreakable Enterprise Kernel Release 5 Update 1.

Security (CVE) Fixes

A full list of CVEs fixed in this release can be found in the Release Notes for the UEK R5 Update 1.

Supported upgrade path

Customers can upgrade existing Oracle Linux 7 Update 5 (and later) servers using the Unbreakable Linux Network or the Oracle Linux yum server.

Software Download

Oracle Linux can be downloaded, used, and distributed free of charge and all updates and errata are freely available. This allows you to decide which of your systems require a support subscription and makes Oracle Linux an ideal choice for your development, testing and production systems. You decide which support coverage is the best for each of your systems individually, while keeping all of your systems up-to-date and secure. For customers with Oracle Linux Premier Support, you also receive access to zero-downtime kernel updates using Oracle Ksplice and support for Oracle OpenStack.


UEK R5 Update 1 is fully compatible with the UEK R5 GA release. The kernel ABI for UEK R5 remains unchanged in all subsequent updates to the initial release. In this release, there are changes to the kernel ABI relative to UEK R4 that require recompilation of third-party kernel modules on the system. Before installing UEK R5, verify its support status with your application vendor.

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