Operating System:

[RedHat]

Published:

14 October 2021

Protect yourself against future threats.

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2021.3389
                   kernel-rt security and bug fix update
                              14 October 2021

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           kernel-rt
Publisher:         Red Hat
Operating System:  Red Hat
Impact/Access:     Increased Privileges     -- Existing Account
                   Denial of Service        -- Existing Account
                   Access Confidential Data -- Existing Account
                   Reduced Security         -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-22543 CVE-2021-3656 CVE-2021-3653

Reference:         ESB-2021.3386
                   ESB-2021.3324
                   ESB-2021.3249
                   ESB-2021.3225

Original Bulletin: 
   https://access.redhat.com/errata/RHSA-2021:3802

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: kernel-rt security and bug fix update
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
CVE Names:         CVE-2021-3653 CVE-2021-3656 CVE-2021-22543 
=====================================================================

1. Summary:

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 impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

2. 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

3. Description:

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)

4. 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.

5. Bugs fixed (https://bugzilla.redhat.com/):

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)

6. 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:
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-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-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

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. 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

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2021 Red Hat, Inc.
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