Davoud Teimouri – Virtualization and Data Center

Oracle Unbreakable Enterprise Kernel Release 5 Update 2

The Unbreakable Enterprise Kernel (UEK) for Oracle Linux provides the latest open source innovations and key optimizations and security to enterprise cloud workloads. It is the Linux kernel that powers Oracle Cloud and Oracle Engineered Systems such as Oracle Exadata Database Machine as well as Oracle Linux on any Intel-64, AMD-64 or ARM hardware.

What’re Notable New Features and Changes in Oracle Unbreakable Enterprise Kernel Release 5 Update 2

UEK R5 Update 2 is based on the mainline kernel version 4.14.35. Through actively monitoring upstream check-ins and collaboration with partners and customers, Oracle continues to improve and apply critical bug and security fixes to the Unbreakable Enterprise Kernel (UEK) R5 for Oracle Linux. This update includes several new features, added functionality, and bug fixes across a range of subsystems.

Notable Driver Features

The following new features are noted in the drivers shipped with UEK R5U2 as opposed to the original release of UEK R5:


Oracle Linux maintains full user space compatibility with Red Hat Enterprise Linux, which is independent of the kernel version running underneath the operating system. Existing applications in user space will continue to run unmodified on the Unbreakable Enterprise Kernel Release 5 and no re-certifications are needed for RHEL certified applications.

To minimize impact on interoperability during releases, the Oracle Linux team works closely with third-party vendors whose hardware and software have dependencies on kernel modules. The kernel ABI for UEK R5 will remain 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.

List of CVEs Fixed in This Release

The following list describes the CVEs that are fixed in this release. The content provided here is automatically generated and includes the CVE identifier and a summary of the issue. The associated internal Oracle bug identifiers are also included to reference work that was carried out to address each issue.

For more details on these and other new features and changes, please consult the Release Notes for the UEK R5 Update

Further Reading

[Review]: Oracle Unbreakable Enterprise Kernel Release 5

[Review]: What’s kernel Live Patching?

Achieved Best Performance on Oracle Linux by Oracle Validated Configurations

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