# ELSA-2021-9451: Security update for 2 packages

ELSA-2021-9451, released September 16, 2021, fixes 4 CVEs across 2 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-9451
- Platform: Linux
- Released: Sep 16, 2021
- Priority: High (Closes CVE-2021-22543, high severity)
- CVEs: 4, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-9451.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kernel-uek-container](https://patchblox.com/security/data/product/linux/kernel-uek-container.md) | ol 8 | 0:5.4.17-2102.205.7.2.el8 |
| [kernel-uek-container-debug](https://patchblox.com/security/data/product/linux/kernel-uek-container-debug.md) | ol 8 | 0:5.4.17-2102.205.7.2.el8 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-22543](https://patchblox.com/security/data/cve/CVE-2021-22543.md) | High | kpatch-patch-4_18_0-305_3_1: This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of... | 7.8 | 0.0066 |  |
| [CVE-2021-3609](https://patchblox.com/security/data/cve/CVE-2021-3609.md) | High | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: r... | 7.0 | 0.0043 |  |
| [CVE-2021-3573](https://patchblox.com/security/data/cve/CVE-2021-3573.md) | Routine | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es): * kernel: ou... | 6.7 | 0.0037 |  |
| [CVE-2020-36311](https://patchblox.com/security/data/cve/CVE-2020-36311.md) | Routine | kernel-uek: [5.4.17-2102.205.7.2] - btrfs: fix race between marking inode needs to be logged and log syncing (Filipe Manana)  [Or... | 5.5 | 0.0034 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo