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Critical Kernel Fix for Red Hat Enterprise Linux 7: RHSA-2021:3802-01

red hat
Calendar Grey October 12, 2021
Dist Redhat Esm H88
The latest kernel-rt update for Red Hat Enterprise Linux 7 addresses critical vulnerabilities and various bugs, in accordance with the associated CVEs.
An update for kernel-rt is now available for Red Hat Enterprise Linux 7

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: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
* kernel: SVM nested virtualization issue in KVM (AVIC support) (CVE-2021-3653)
* kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE) (CVE-2021-3656)
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):
* Indefinite waiting for RCU callback while removing cgroup (BZ#1967844)
* kernel-rt: update to the latest RHEL7.9.z9 source tree (BZ#2002994)

Topics%20covered

Topics Covered

security advisory security issue Red Hat important KVM kernel-rt

References

https://access.redhat.com/security/cve/CVE-2021-3653 https://access.redhat.com/security/cve/CVE-2021-3656 https://access.redhat.com/security/cve/CVE-2021-22543 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux for Real Time for NFV (v. 7):
Source: kernel-rt-3.10.0-1160.45.1.rt56.1185.el7.src.rpm
noarch: kernel-rt-doc-3.10.0-1160.45.1.rt56.1185.el7.noarch.rpm
x86_64: kernel-rt-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-debug-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-debug-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-debug-devel-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-debug-kvm-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-debug-kvm-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-debuginfo-common-x86_64-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-devel-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-kvm-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-kvm-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-trace-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-trace-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-trace-devel-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-trace-kvm-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm kernel-rt-trace-kvm-debuginfo-3.10.0-1160.45.1.rt56.1185.el7.x86_64.rpm
Red Hat Enterprise Linux for Real Time (v. 7):
Source:

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3802-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3802
Issue date: 2021-10-12

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 7.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 security issue Red Hat important KVM kernel-rt

Relevant Releases Architectures

Red Hat Enterprise Linux for Real Time (v. 7) - noarch, x86_64

Red Hat Enterprise Linux for Real Time for NFV (v. 7) - noarch, x86_64

Bugs Fixed

1965461 - CVE-2021-22543 kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks

1967844 - Indefinite waiting for RCU callback while removing cgroup

1983686 - CVE-2021-3653 kernel: SVM nested virtualization issue in KVM (AVIC support)

1983988 - CVE-2021-3656 kernel: SVM nested virtualization issue in KVM (VMLOAD/VMSAVE)

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