# RHSA-2021:2563: Security update for 2 packages

RHSA-2021:2563, released June 29, 2021, fixes 1 CVE across 2 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-2563
- Platform: Linux
- Released: Jun 29, 2021
- Priority: High (Closes CVE-2021-33034, high severity)
- CVEs: 1, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:2563

## 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 | 0:1-2.el8 |
| [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 | 0:1-1.el8_4 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-33034](https://patchblox.com/security/data/cve/CVE-2021-33034.md) | High | kernel-rt-debug-devel: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high... | 7.8 | 0.0083 |  |

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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo