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Red Hat: RHSA-2021-3375-01 Important Kernel-RT Security Update

red hat
Calendar Grey August 31, 2021
Dist Redhat Esm H88
A crucial patch addressing kernel vulnerabilities and significant bug fixes is now rolled out for Red Hat Enterprise Linux 8.2 Extended Update Support.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 Extended Update Support

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: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)
* kernel: Improper handling of VM_IO|VM_PFNMAP vmas in KVM can bypass RO checks (CVE-2021-22543)
* kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c (CVE-2021-22555)
* kernel: race condition for removal of the HCI controller (CVE-2021-32399)
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 latest RHEL-8.2.z11 Batch source tree (BZ#1984586)

Topics%20covered

Topics Covered

security advisory bug fix important red hat enterprise kernel-rt

References

https://access.redhat.com/security/cve/CVE-2021-3609 https://access.redhat.com/security/cve/CVE-2021-22543 https://access.redhat.com/security/cve/CVE-2021-22555 https://access.redhat.com/security/cve/CVE-2021-32399 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2):
Source: kernel-rt-4.18.0-193.64.1.rt13.115.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debug-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debug-core-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debug-debuginfo-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debug-devel-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debug-kvm-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debug-modules-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debug-modules-extra-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debuginfo-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-debuginfo-common-x86_64-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-devel-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-kvm-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-modules-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-modules-extra-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source: kernel-rt-4.18.0-193.64.1.rt13.115.el8_2.src.rpm
x86_64: kernel-rt-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm kernel-rt-core-4.18.0-193.64.1.rt13.115.el8_2.x86_64.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3375-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3375
Issue date: 2021-08-31

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2Extended Update Support.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

Relevant Releases Architectures

Red Hat Enterprise Linux Real Time EUS (v. 8.2) - x86_64

Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) - x86_64

Bugs Fixed

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

1970807 - CVE-2021-32399 kernel: race condition for removal of the HCI controller

1971651 - CVE-2021-3609 kernel: race condition in net/can/bcm.c leads to local privilege escalation

1980101 - CVE-2021-22555 kernel: out-of-bounds write in xt_compat_target_from_user() in net/netfilter/x_tables.c

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