# RHSA-2021:4647: Security update for 23 packages

RHSA-2021:4647, released November 15, 2021, fixes 2 CVEs across 23 products. None of them is reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/fix/linux/rhsa-2021-4647
- Platform: Linux
- Released: Nov 15, 2021
- Priority: High (Closes CVE-2021-43267, high severity)
- CVEs: 2, exploited: 0, on CISA KEV: 0
- Vendor advisory: https://access.redhat.com/errata/RHSA-2021:4647

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [bpftool](https://patchblox.com/security/data/product/linux/bpftool.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel](https://patchblox.com/security/data/product/linux/kernel.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-abi-stablelists](https://patchblox.com/security/data/product/linux/kernel-abi-stablelists.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-core](https://patchblox.com/security/data/product/linux/kernel-core.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-debug](https://patchblox.com/security/data/product/linux/kernel-debug.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-debug-core](https://patchblox.com/security/data/product/linux/kernel-debug-core.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-debug-devel](https://patchblox.com/security/data/product/linux/kernel-debug-devel.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-debug-modules](https://patchblox.com/security/data/product/linux/kernel-debug-modules.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-debug-modules-extra](https://patchblox.com/security/data/product/linux/kernel-debug-modules-extra.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-devel](https://patchblox.com/security/data/product/linux/kernel-devel.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-doc](https://patchblox.com/security/data/product/linux/kernel-doc.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-modules](https://patchblox.com/security/data/product/linux/kernel-modules.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-modules-extra](https://patchblox.com/security/data/product/linux/kernel-modules-extra.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-tools](https://patchblox.com/security/data/product/linux/kernel-tools.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-tools-libs](https://patchblox.com/security/data/product/linux/kernel-tools-libs.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-tools-libs-devel](https://patchblox.com/security/data/product/linux/kernel-tools-libs-devel.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-zfcpdump](https://patchblox.com/security/data/product/linux/kernel-zfcpdump.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-zfcpdump-core](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-core.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-zfcpdump-devel](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-devel.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-zfcpdump-modules](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [kernel-zfcpdump-modules-extra](https://patchblox.com/security/data/product/linux/kernel-zfcpdump-modules-extra.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [perf](https://patchblox.com/security/data/product/linux/perf.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |
| [python3-perf](https://patchblox.com/security/data/product/linux/python3-perf.md) | RHEL 8 | 0:4.18.0-348.2.1.el8_5 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2021-43267](https://patchblox.com/security/data/cve/CVE-2021-43267.md) | High | kpatch-patch-4_18_0-348: This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of... | 9.8 | 0.5785 |  |
| [CVE-2021-20317](https://patchblox.com/security/data/cve/CVE-2021-20317.md) | High | kernel-debug: The kernel packages contain the Linux kernel, the core of any Linux operating system.  Security Fix(es):  * kernel: I... | 8.8 | 0.0038 |  |

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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