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Red Hat Enterprise Linux 8 RHSA-2021-2169 Important Kernel-RT Update

red hat
Calendar Grey June 1, 2021
Dist Redhat Esm H88
The recent update from Red Hat for kernel-rt targets critical security vulnerabilities and includes various bug corrections for Enterprise Linux 8, promoting system integrity.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

The system must be rebooted for this update to take effect.

Summary

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: 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)
* kernel: nitro_enclaves stale file descriptors on failed usercopy (CVE-2021-3543)
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.z0 source tree (BZ#1957489)

Topics%20covered

Topics Covered

security advisory bug fix important Red Hat Enterprise kernel-rt update real-time kernel KVM API issue

References

https://access.redhat.com/security/cve/CVE-2021-3501 https://access.redhat.com/security/cve/CVE-2021-3543 https://access.redhat.com/security/updates/classification#important

Package List

Red Hat Enterprise Linux Real Time for NFV (v. 8):
Source: kernel-rt-4.18.0-305.3.1.rt7.75.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-core-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-devel-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-kvm-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-modules-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debuginfo-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-devel-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-kvm-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-modules-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-modules-extra-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm
Red Hat Enterprise Linux Real Time (v. 8):
Source: kernel-rt-4.18.0-305.3.1.rt7.75.el8_4.src.rpm
x86_64: kernel-rt-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-core-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm kernel-rt-debug-4.18.0-305.3.1.rt7.75.el8_4.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:2169-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2169
Issue date: 2021-06-01

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.Red Hat Product Security has rated this update as having a security impactof Important. A Common Vulnerability Scoring System (CVSS) base score,which gives a detailed severity rating, is available for each vulnerabilityfrom the CVE link(s) in the References section.

Topics%20covered

Topics Covered

security advisory bug fix important Red Hat Enterprise kernel-rt update real-time kernel KVM API issue

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time (v. 8) - x86_64

Red Hat Enterprise Linux Real Time for NFV (v. 8) - x86_64

Bugs Fixed

1950136 - CVE-2021-3501 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

1953022 - CVE-2021-3543 kernel: nitro_enclaves stale file descriptors on failed usercopy

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