# ELSA-2021-9565: Security update for 2 packages

ELSA-2021-9565, released November 23, 2021, fixes 3 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-9565
- Platform: Linux
- Released: Nov 23, 2021
- Priority: High (Closes CVE-2021-3656, high severity)
- CVEs: 3, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-9565.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel-uek-container](https://patchblox.com/security/data/product/linux/kernel-uek-container.md) | ol 8 | 0:5.4.17-2136.301.1.2.el8 |
| [kernel-uek-container-debug](https://patchblox.com/security/data/product/linux/kernel-uek-container-debug.md) | ol 8 | 0:5.4.17-2136.301.1.2.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-3656](https://patchblox.com/security/data/cve/CVE-2021-3656.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: u... | 8.8 | 0.0066 |  |
| [CVE-2021-3744](https://patchblox.com/security/data/cve/CVE-2021-3744.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: f... | 8.2 | 0.0053 |  |
| [CVE-2021-3653](https://patchblox.com/security/data/cve/CVE-2021-3653.md) | High | kernel-rt-debug-modules: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 8.8 | 0.0045 |  |

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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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo