- Vulnerability/
- RHSA-2021:4648
RHSA-2021:4648: Important: kernel-rt security and bug fix update
First published: Mon Nov 15 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: Insufficient validation of user-supplied sizes for the MSG_CRYPTO message type (CVE-2021-43267)</li> <li> kernel: timer tree corruption leads to missing wakeup and system freeze (CVE-2021-20317)</li> <li> kernel: fuse: stall on CPU can occur because a retry loop continually finds the same bad inode (CVE-2021-28950)</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.z5 source tree (BZ#2017122)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-core | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debug | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debug-core | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debug-debuginfo | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debug-devel | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debug-modules | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debug-modules-extra | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debuginfo | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-devel | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-modules | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-modules-extra | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-debug-kvm | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
| redhat/kernel-rt-kvm | <4.18.0-305.28.1.rt7.100.el8_4 | 4.18.0-305.28.1.rt7.100.el8_4 |
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Reference Links
Frequently Asked Questions
What is the severity of RHSA-2021:4648?
The severity of RHSA-2021:4648 is considered to be moderate due to the information leakage and potential impact on system security.
How do I fix RHSA-2021:4648?
To fix RHSA-2021:4648, update the kernel-rt packages to version 4.18.0-305.28.1.rt7.100.el8_4 or later.
Which systems are affected by RHSA-2021:4648?
RHSA-2021:4648 affects systems running the kernel-rt packages prior to version 4.18.0-305.28.1.rt7.100.el8_4 on Red Hat Enterprise Linux.
What vulnerabilities does RHSA-2021:4648 address?
RHSA-2021:4648 addresses the CVE-2021-43267 vulnerability related to insufficient validation of user-supplied sizes for the MSG_CRYPTO message type.
Is a system reboot required after applying the fix for RHSA-2021:4648?
Yes, a system reboot is required to apply the kernel updates from RHSA-2021:4648.
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