# CVE-2021-22543: 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...

CVE-2021-22543 is fixed in 51 products on 1 platform, first by RHSA-2021:3057, released August 10, 2021. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2021-22543
- Priority: High
- CVSS: 7.8 (Important)
- EPSS: 0.0066
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 10, 2021

## Description

This is a kernel live patch module which is automatically loaded by the RPM post-install script to modify the code of a running kernel.  Security Fix(es):  * kernel: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)  * kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)  * kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | bpftool ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-abi-stablelists RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-abi-stablelists ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-core RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-core ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-cross-headers ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-debug RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-debug ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-debug-core RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-debug-core ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-debug-devel RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-debug-devel ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-debug-modules RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-debug-modules ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-debug-modules-extra RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-debug-modules-extra ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-devel RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-devel ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-doc RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-doc ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-headers ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-modules RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-modules ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-modules-extra RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-modules-extra ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-rt RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-core RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-debug RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-debug-core RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-debug-devel RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-debug-kvm RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-debug-modules RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-debug-modules-extra RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-devel RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-kvm RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-modules RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-rt-modules-extra RHEL 8 | 0:4.18.0-305.12.1.rt7.84.el8_4 | [RHSA-2021:3088](https://patchblox.com/security/data/fix/linux/rhsa-2021-3088.md) | Aug 10, 2021 |
| Linux | kernel-tools RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-tools ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-tools-libs RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-tools-libs ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-tools-libs-devel RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-tools-libs-devel ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | kernel-uek ol 8 | 0:5.4.17-2102.205.7.2.el8uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | kernel-uek-container ol 8 | 0:5.4.17-2102.205.7.2.el8 | [ELSA-2021-9451](https://patchblox.com/security/data/fix/linux/elsa-2021-9451.md) | Sep 16, 2021 |
| Linux | kernel-uek-container-debug ol 8 | 0:5.4.17-2102.205.7.2.el8 | [ELSA-2021-9451](https://patchblox.com/security/data/fix/linux/elsa-2021-9451.md) | Sep 16, 2021 |
| Linux | kernel-uek-debug ol 8 | 0:5.4.17-2102.205.7.2.el8uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | kernel-uek-debug-devel ol 8 | 0:5.4.17-2102.205.7.2.el8uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | kernel-uek-devel ol 8 | 0:5.4.17-2102.205.7.2.el8uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | kernel-uek-doc ol 8 | 0:5.4.17-2102.205.7.2.el8uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | kernel-uek-tools ol 8 | 0:5.4.17-2102.205.7.2.el7uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | kernel-uek-tools-libs ol 8 | 0:5.4.17-2102.205.7.2.el7uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | kernel-zfcpdump RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-zfcpdump-core RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-zfcpdump-devel RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-zfcpdump-modules RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kernel-zfcpdump-modules-extra RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | kpatch-patch-4_18_0-305 RHEL 8 | 0:1-4.el8 | [RHSA-2021:3044](https://patchblox.com/security/data/fix/linux/rhsa-2021-3044.md) | Aug 10, 2021 |
| Linux | kpatch-patch-4_18_0-305_10_2 RHEL 8 | 0:1-1.el8_4 | [RHSA-2021:3044](https://patchblox.com/security/data/fix/linux/rhsa-2021-3044.md) | Aug 10, 2021 |
| Linux | kpatch-patch-4_18_0-305_3_1 RHEL 8 | 0:1-3.el8_4 | [RHSA-2021:3044](https://patchblox.com/security/data/fix/linux/rhsa-2021-3044.md) | Aug 10, 2021 |
| Linux | kpatch-patch-4_18_0-305_7_1 RHEL 8 | 0:1-2.el8_4 | [RHSA-2021:3044](https://patchblox.com/security/data/fix/linux/rhsa-2021-3044.md) | Aug 10, 2021 |
| Linux | perf RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | perf ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |
| Linux | python-perf ol 8 | 0:5.4.17-2102.205.7.2.el7uek | [ELSA-2021-9450](https://patchblox.com/security/data/fix/linux/elsa-2021-9450.md) | Sep 16, 2021 |
| Linux | python3-perf RHEL 8 | 0:4.18.0-305.12.1.el8_4 | [RHSA-2021:3057](https://patchblox.com/security/data/fix/linux/rhsa-2021-3057.md) | Aug 10, 2021 |
| Linux | python3-perf ol 8 | 0:4.18.0-305.12.1.el8_4 | [ELSA-2021-3057](https://patchblox.com/security/data/fix/linux/elsa-2021-3057.md) | Aug 11, 2021 |

---

Data as of 2026-11-09T07:25:28Z 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

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.