# CVE-2020-26541: kernel-rt-kvm: The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high...

CVE-2020-26541 is fixed in 37 products on 1 platform, first by RHSA-2021:2570, released June 29, 2021. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2020-26541
- Priority: Routine
- CVSS: 6.5 (Important)
- EPSS: 0.0053
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 29, 2021

## Description

The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.  Security Fix(es):  * kernel: use-after-free in net/bluetooth/hci_event.c when destroying an hci_chan (CVE-2021-33034)  * kernel: security bypass in certs/blacklist.c and certs/system_keyring.c (CVE-2020-26541)  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.  Bug Fix(es):  * kernel-rt: update RT source tree to the RHEL-8.4.z1 source tree (BZ#1965378)  * panic caused by i40e_msix_clean_rings [rhel-rt] (BZ#1965970)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | bpftool RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | bpftool ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-abi-stablelists RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-abi-stablelists ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-core RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-core ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-cross-headers ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-debug RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-debug ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-debug-core RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-debug-core ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-debug-devel RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-debug-devel ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-debug-modules RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-debug-modules ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-debug-modules-extra RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-debug-modules-extra ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-devel RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-devel ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-doc RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-doc ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-headers ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-modules RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-modules ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-modules-extra RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-modules-extra ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-rt RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-core RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-debug RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-debug-core RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-debug-devel RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-debug-kvm RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-debug-modules RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-debug-modules-extra RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-devel RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-kvm RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-modules RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-rt-modules-extra RHEL 8 | 0:4.18.0-305.7.1.rt7.79.el8_4 | [RHSA-2021:2599](https://patchblox.com/security/data/fix/linux/rhsa-2021-2599.md) | Jun 29, 2021 |
| Linux | kernel-tools RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-tools ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-tools-libs RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-tools-libs ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-tools-libs-devel RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-tools-libs-devel ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | kernel-zfcpdump RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-zfcpdump-core RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-zfcpdump-devel RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-zfcpdump-modules RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | kernel-zfcpdump-modules-extra RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | perf RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | perf ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |
| Linux | python3-perf RHEL 8 | 0:4.18.0-305.7.1.el8_4 | [RHSA-2021:2570](https://patchblox.com/security/data/fix/linux/rhsa-2021-2570.md) | Jun 29, 2021 |
| Linux | python3-perf ol 8 | 0:4.18.0-305.7.1.el8_4 | [ELSA-2021-2570](https://patchblox.com/security/data/fix/linux/elsa-2021-2570.md) | Jul 1, 2021 |

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