# ELSA-2026-500239: microcode_ctl security update

ELSA-2026-500239, released September 16, 2026, fixes 14 CVEs in microcode_ctl (version 4:20260812-1.0.2.el9_8). None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2026-500239
- Platform: Linux
- Released: Sep 16, 2026
- Priority: High (Closes CVE-2026-20715, high severity)
- CVEs: 14, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2026-500239.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [microcode_ctl](https://patchblox.com/security/data/product/linux/microcode-ctl.md) | ol 10 | 4:20260812-1.0.2.el9_8 |
| [microcode_ctl](https://patchblox.com/security/data/product/linux/microcode-ctl.md) | ol 8 | 4:20260812-1.0.2.el9_8 |
| [microcode_ctl](https://patchblox.com/security/data/product/linux/microcode-ctl.md) | ol 9 | 4:20260812-1.0.2.el9_8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2026-20715](https://patchblox.com/security/data/cve/CVE-2026-20715.md) | High | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 7.5 | 0.0043 |  |
| [CVE-2026-20885](https://patchblox.com/security/data/cve/CVE-2026-20885.md) | High | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 7.2 | 0.0015 |  |
| [CVE-2026-20898](https://patchblox.com/security/data/cve/CVE-2026-20898.md) | High | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 7.2 | 0.0013 |  |
| [CVE-2026-20713](https://patchblox.com/security/data/cve/CVE-2026-20713.md) | High | intel-microcode: Always-incorrect control flow implementation in some firmware for some Intel(R) Xeon(R) processors may allow an escal... | 7.5 | 0.0010 |  |
| [CVE-2026-20708](https://patchblox.com/security/data/cve/CVE-2026-20708.md) | Routine | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 4.4 | 0.0032 |  |
| [CVE-2026-20712](https://patchblox.com/security/data/cve/CVE-2026-20712.md) | Routine | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 6.0 | 0.0016 |  |
| [CVE-2026-20734](https://patchblox.com/security/data/cve/CVE-2026-20734.md) | Routine | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 4.4 | 0.0016 |  |
| [CVE-2026-20705](https://patchblox.com/security/data/cve/CVE-2026-20705.md) | Routine | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 5.3 | 0.0013 |  |
| [CVE-2026-20775](https://patchblox.com/security/data/cve/CVE-2026-20775.md) | Routine | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 5.3 | 0.0013 |  |
| [CVE-2026-20917](https://patchblox.com/security/data/cve/CVE-2026-20917.md) | Routine | ucode-intel: This update for ucode-intel fixes the following issues:  - Intel CPU Microcode was updated to the 20260812 release (b... | 5.3 | 0.0011 |  |
| [CVE-2026-20760](https://patchblox.com/security/data/cve/CVE-2026-20760.md) | Routine | intel-microcode: Improper handling of overlap between protected memory ranges in some microcode for some Intel(R) Processors within Ri... | 5.5 | 0.0010 |  |
| [CVE-2026-20901](https://patchblox.com/security/data/cve/CVE-2026-20901.md) | Routine | intel-microcode: Improper input validation for some Intel(R) Xeon(R) processors within firmware may allow an escalation of privilege | 5.3 | 0.0010 |  |
| [CVE-2025-31356](https://patchblox.com/security/data/cve/CVE-2025-31356.md) | Routine | microcode_ctl: [4:20260812-1.0.3] - disable late update for 06-ad-01 - add support for UEK7/UEK8 and ueknext kernels - don't bother... | 6.1 | 0.0007 |  |
| [CVE-2026-20707](https://patchblox.com/security/data/cve/CVE-2026-20707.md) | Routine | intel-microcode: Hardware logic contains race conditions for some 3rd Gen Intel(R) Xeon(R) Scalable Processors within Ring 3: unprivil... | 5.6 | 0.0007 |  |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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