- Vulnerability/
- RHSA-2021:2169
RHSA-2021:2169: Important: kernel-rt security and bug fix update
First published: Tue Jun 01 2021(Updated: )
The kernel-rt packages provide the Real Time Linux Kernel, which enables fine-tuning for systems with extremely high determinism requirements.<br>Security Fix(es):<br><li> kernel: userspace applications can misuse the KVM API to cause a write of 16 bytes at an offset up to 32 GB from vcpu->run (CVE-2021-3501)</li> <li> kernel: nitro_enclaves stale file descriptors on failed usercopy (CVE-2021-3543)</li> 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.<br>Bug Fix(es):<br><li> kernel-rt: update RT source tree to the RHEL-8.4.z0 source tree (BZ#1957489)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-core | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debug | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debug-core | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debug-debuginfo | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debug-devel | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debug-modules | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debug-modules-extra | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debuginfo | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-devel | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-modules | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-modules-extra | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-debug-kvm | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
| redhat/kernel-rt-kvm | <4.18.0-305.3.1.rt7.75.el8_4 | 4.18.0-305.3.1.rt7.75.el8_4 |
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Reference Links
Frequently Asked Questions
What is the severity of RHSA-2021:2169?
The severity of RHSA-2021:2169 is classified as important due to the potential misuse of the KVM API by userspace applications.
How do I fix RHSA-2021:2169?
To fix RHSA-2021:2169, update to the kernel-rt package version 4.18.0-305.3.1.rt7.75.el8_4 or later.
Which packages are affected by RHSA-2021:2169?
The affected packages include kernel-rt, kernel-rt-core, kernel-rt-debug, and several other kernel-rt related packages.
What vulnerabilities does RHSA-2021:2169 address?
RHSA-2021:2169 addresses vulnerabilities that allow userspace applications to misuse the KVM API, leading to unauthorized memory write operations.
When was the RHSA-2021:2169 advisory released?
The RHSA-2021:2169 advisory was released on 2021-07-30.
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