# ELSA-2021-3057: Security update for 20 packages

ELSA-2021-3057, released August 11, 2021, fixes 3 CVEs across 20 products. One of them is being exploited (CVE-2021-22555); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/linux/elsa-2021-3057
- Platform: Linux
- Released: Aug 11, 2021
- Priority: Patch now (Closes CVE-2021-22555, exploited (CISA KEV))
- CVEs: 3, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://linux.oracle.com/errata/ELSA-2021-3057.html

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [bpftool](https://patchblox.com/security/data/product/linux/bpftool.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-abi-stablelists](https://patchblox.com/security/data/product/linux/kernel-abi-stablelists.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-core](https://patchblox.com/security/data/product/linux/kernel-core.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-cross-headers](https://patchblox.com/security/data/product/linux/kernel-cross-headers.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-debug](https://patchblox.com/security/data/product/linux/kernel-debug.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-debug-core](https://patchblox.com/security/data/product/linux/kernel-debug-core.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-debug-devel](https://patchblox.com/security/data/product/linux/kernel-debug-devel.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-debug-modules](https://patchblox.com/security/data/product/linux/kernel-debug-modules.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-debug-modules-extra.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-devel](https://patchblox.com/security/data/product/linux/kernel-devel.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-doc](https://patchblox.com/security/data/product/linux/kernel-doc.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-headers](https://patchblox.com/security/data/product/linux/kernel-headers.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-modules](https://patchblox.com/security/data/product/linux/kernel-modules.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-modules-extra](https://patchblox.com/security/data/product/linux/kernel-modules-extra.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-tools](https://patchblox.com/security/data/product/linux/kernel-tools.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-tools-libs](https://patchblox.com/security/data/product/linux/kernel-tools-libs.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [kernel-tools-libs-devel](https://patchblox.com/security/data/product/linux/kernel-tools-libs-devel.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [perf](https://patchblox.com/security/data/product/linux/perf.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |
| [python3-perf](https://patchblox.com/security/data/product/linux/python3-perf.md) | ol 8 | 0:4.18.0-305.12.1.el8_4 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-22555](https://patchblox.com/security/data/cve/CVE-2021-22555.md) | Patch now | bpftool: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: r... | 7.8 | 0.7868 | CISA KEV |
| [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 |  |

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Data as of 2026-11-07T18:46:35Z 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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