- Vulnerability/
- RHSA-2021:3440
RHSA-2021:3440: Moderate: kernel-rt security and bug fix update
First published: Tue Sep 07 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: slab-out-of-bounds access in xdr_set_page_base() in net/sunrpc/xdr.c (CVE-2021-38201)</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> OSLAT spikes on subset of cpus (BZ#1986063)</li> <li> kernel-rt: update RT source tree to the RHEL-8.4.z source tree (BZ#1990013)</li> <li> Failure to enter full_nohz due to needless SCHED softirqs (BZ#1990272)</li> <li> kernel-rt: Make rcu_normal_after_boot writable (BZ#1995431)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-core | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debug | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debug-core | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debug-debuginfo | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debug-devel | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debug-modules | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debug-modules-extra | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debuginfo | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-devel | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-modules | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-modules-extra | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-debug-kvm | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
| redhat/kernel-rt-kvm | <4.18.0-305.17.1.rt7.89.el8_4 | 4.18.0-305.17.1.rt7.89.el8_4 |
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Reference Links
Frequently Asked Questions
What is the severity of RHSA-2021:3440?
The severity of RHSA-2021:3440 is categorized as important.
How do I fix RHSA-2021:3440?
To fix RHSA-2021:3440, update your kernel-rt packages to version 4.18.0-305.17.1.rt7.89.el8_4.
What vulnerability is addressed in RHSA-2021:3440?
RHSA-2021:3440 addresses a slab-out-of-bounds access vulnerability in xdr_set_page_base() in net/sunrpc/xdr.c (CVE-2021-38201).
Which packages are affected by RHSA-2021:3440?
The affected packages for RHSA-2021:3440 include kernel-rt, kernel-rt-core, and various kernel-rt-debug packages.
What is the main purpose of kernel-rt packages related to RHSA-2021:3440?
Kernel-rt packages provide a Real Time Linux Kernel that is optimized for systems requiring high determinism.
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