# RHSA-2021:3044: Security update for 4 packages

RHSA-2021:3044, released August 10, 2021, fixes 3 CVEs across 4 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/rhsa-2021-3044
- Platform: Linux
- Released: Aug 10, 2021
- Priority: Patch now (Closes CVE-2021-22555, exploited (CISA KEV))
- CVEs: 3, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:3044

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [kpatch-patch-4_18_0-305](https://patchblox.com/security/data/product/linux/kpatch-patch-4-18-0-305.md) | RHEL 8 | 0:1-4.el8 |
| [kpatch-patch-4_18_0-305_10_2](https://patchblox.com/security/data/product/linux/kpatch-patch-4-18-0-305-10-2.md) | RHEL 8 | 0:1-1.el8_4 |
| [kpatch-patch-4_18_0-305_3_1](https://patchblox.com/security/data/product/linux/kpatch-patch-4-18-0-305-3-1.md) | RHEL 8 | 0:1-3.el8_4 |
| [kpatch-patch-4_18_0-305_7_1](https://patchblox.com/security/data/product/linux/kpatch-patch-4-18-0-305-7-1.md) | RHEL 8 | 0:1-2.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 2026-11-07T12:40:37Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo