# ELSA-2021-9406: Security update for 2 packages

ELSA-2021-9406, released August 10, 2021, fixes 10 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-9406
- Platform: Linux
- Released: Aug 10, 2021
- Priority: High (Closes CVE-2021-33909, high severity)
- CVEs: 10, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-9406.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel-uek-container](https://patchblox.com/security/data/product/linux/kernel-uek-container.md) | ol 8 | 0:5.4.17-2102.204.4.2.el8 |
| [kernel-uek-container-debug](https://patchblox.com/security/data/product/linux/kernel-uek-container-debug.md) | ol 8 | 0:5.4.17-2102.204.4.2.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-33909](https://patchblox.com/security/data/cve/CVE-2021-33909.md) | High | kernel-core: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: s... | 7.8 | 0.0981 |  |
| [CVE-2021-23134](https://patchblox.com/security/data/cve/CVE-2021-23134.md) | High | kernel-uek-devel: [5.4.17-2102.204.4.2] - rds/ib: quarantine STALE mr before dereg (Manjunath Patil)  [Orabug: 33150447]  [5.4.17-2102.... | 7.8 | 0.0038 |  |
| [CVE-2020-26147](https://patchblox.com/security/data/cve/CVE-2020-26147.md) | Routine | kernel-rt-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 5.4 | 0.0760 |  |
| [CVE-2020-24586](https://patchblox.com/security/data/cve/CVE-2020-24586.md) | Routine | kernel-rt-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 4.3 | 0.0577 |  |
| [CVE-2020-24588](https://patchblox.com/security/data/cve/CVE-2020-24588.md) | Routine | Windows Wireless Networking Spoofing Vulnerability | 6.5 | 0.0361 |  |
| [CVE-2020-26145](https://patchblox.com/security/data/cve/CVE-2020-26145.md) | Routine | kernel-modules: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es): * kernel: ou... | 6.5 | 0.0352 |  |
| [CVE-2020-26141](https://patchblox.com/security/data/cve/CVE-2020-26141.md) | Routine | kernel-rt-kvm: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 6.5 | 0.0307 |  |
| [CVE-2020-24587](https://patchblox.com/security/data/cve/CVE-2020-24587.md) | Routine | Windows Wireless Networking Information Disclosure Vulnerability | 6.5 | 0.0259 |  |
| [CVE-2021-3564](https://patchblox.com/security/data/cve/CVE-2021-3564.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es): * kernel: ou... | 6.3 | 0.0049 |  |
| [CVE-2020-14304](https://patchblox.com/security/data/cve/CVE-2020-14304.md) | Routine | kernel-uek: [5.4.17-2102.204.4.2] - rds/ib: quarantine STALE mr before dereg (Manjunath Patil)  [Orabug: 33150447]  [5.4.17-2102.... | 4.4 | 0.0038 |  |

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Data as of 2026-11-07T06:34:28Z 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