Unbreakable Enterprise Kernel Release Information
The Unbreakable Enterprise Kernel (UEK) is a Linux kernel built by Oracle. Its focus is performance, stability, and minimal backports by tracking the mainline source code as closely as is practical. UEK is used to run Oracle's Engineered Systems, Oracle Cloud Infrastructure, and large enterprise deployments for Oracle customers. UEK is the default kernel on all Oracle Linux based platform images.
UEK Release and Kernel Version Mappings
This reference provides a mapping provides the mapping between UEK releases and updated levels, and the kernel versions that they're associated with, along with UEK release dates.
| UEK Update Level | Kernel Major Release | Kernel Release Date | Oracle Linux Availability |
|---|---|---|---|
| UEK 8 U2 | 6.12.0-200* | March, 2026 | Oracle Linux 9, Oracle Linux 10 |
| UEK 8 U1 | 6.12.0-100* | June, 2025 | Oracle Linux 9, Oracle Linux 10 |
| UEK 8 | 6.12.0-0* | April, 2025 | Oracle Linux 9, Oracle Linux 10 |
| UEK R7U3 | 5.15.0-30* | September, 2024 | Oracle Linux 8, Oracle Linux 9 |
| UEK R7U2 | 5.15.0-20* | October, 2023 | Oracle Linux 8, Oracle Linux 9 |
| UEK R7U1 | 5.15.0-10* | April, 2023 | Oracle Linux 8, Oracle Linux 9 |
| UEK R7 | 5.15.0 | June, 2022 | Oracle Linux 8, Oracle Linux 9 |
| UEK R6U3 | 5.4.17-2136 | October, 2021 | Oracle Linux 8 |
| UEK R6U2 | 5.4.17-2102 | March, 2021 | Oracle Linux 8 |
| UEK R6U1 | 5.4.17-2036 | November, 2020 | Oracle Linux 8 |
| UEK R6 | 5.4.17-2011 | March, 2020 | Oracle Linux 8 |
Certification of UEK for Oracle Products
The following important information applies to the certification of Oracle products with UEK.
Note that certification of different Oracle products with UEK might not be immediately available at the time of a UEK release. Ensure that the product you're using is certified for use with a UEK release before upgrading or installing the kernel. You can check for certification information at https://support.oracle.com/epmos/faces/CertifyHome.
Oracle Automatic Storage Management Cluster File System (Oracle ACFS) certification for different kernel versions is described in Document ID 1369107.1, which is available at https://support.oracle.com/epmos/faces/DocumentDisplay?id=1369107.1.
Compatibility
Oracle Linux maintains full user space compatibility with Red Hat Enterprise Linux (RHEL), which is independent of the kernel version that's running underneath the OS. Note that existing applications in user space continue to run unmodified with UEK. No recertifications are required for RHEL certified applications.
To minimize any impact on interoperability during releases, the Oracle Linux team works with third-party vendors that have hardware and software with dependencies on kernel modules. The kernel ABI for a UEK release remains unchanged in all subsequent updates to the initial release. Customers migrating from an earlier UEK release must be aware that kernel ABIs might change in a more recent UEK release. If an application is using kernel modules, users must verify the support status with the application vendor.
CVE Fixes
CVEs are continually handled in patch updates that are made available as errata builds for the current release. For this reason, it's critical to keep systems updated with the latest package updates for this kernel release.
You can keep current with the latest CVE information at https://linux.oracle.com/cve .