RHSA-2021:4088: Important: kernel-rt security and bug fix update
First published: Tue Nov 02 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: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free (CVE-2020-36385)</li> <li> kernel: out-of-bounds write due to a heap buffer overflow in __hidinput_change_resolution_multipliers() of hid-input.c (CVE-2021-0512)</li> <li> kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE) (CVE-2021-3656)</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.z source tree (BZ#2004117)</li>
| Affected Software | Affected Version | How to fix |
|---|---|---|
| redhat/kernel-rt | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-core | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debug | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debug-core | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debug-debuginfo | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debug-devel | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debug-modules | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debug-modules-extra | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debuginfo | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-devel | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-modules | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-modules-extra | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-debug-kvm | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
| redhat/kernel-rt-kvm | <4.18.0-305.25.1.rt7.97.el8_4 | 4.18.0-305.25.1.rt7.97.el8_4 |
Never miss a vulnerability like this again
Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.
Reference Links
Frequently Asked Questions
What is the severity of RHSA-2021:4088?
The severity of RHSA-2021:4088 is classified as moderate due to a use-after-free vulnerability in the Linux kernel.
How do I fix RHSA-2021:4088?
To fix RHSA-2021:4088, you should update your kernel-rt packages to version 4.18.0-305.25.1.rt7.97.el8_4 or later.
What is the nature of the vulnerability in RHSA-2021:4088?
The vulnerability in RHSA-2021:4088 is a use-after-free issue in the Infiniband driver, which may allow an attacker to execute arbitrary code.
Which packages are affected by RHSA-2021:4088?
The affected packages in RHSA-2021:4088 include kernel-rt, kernel-rt-core, and kernel-rt-debug among others.
Is there a specific operating system associated with RHSA-2021:4088?
RHSA-2021:4088 is associated with Red Hat Enterprise Linux 8.
- agent/weakness
- agent/severity
- agent/type
- agent/softwarecombine
- agent/first-publish-date
- agent/last-modified-date
- agent/title
- agent/remedy
- agent/description
- collector/redhat-errata
- source/Red Hat
- anchor-id/RHSA-2021:4088
- agent/software-canonical-lookup
- agent/references
- agent/tags
- agent/event
- agent/source
- package-manager/redhat