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AUSCERT External Security Bulletin Redistribution
ESB-2021.3978
kernel security update
24 November 2021
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Linux Kernel
Publisher: Red Hat
Operating System: Red Hat
Impact/Access: Increased Privileges -- Existing Account
Denial of Service -- Existing Account
Access Confidential Data -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3653 CVE-2020-36385
Reference: ESB-2021.3974
ESB-2021.3973
ESB-2021.3934
ESB-2021.3916
Original Bulletin:
https://access.redhat.com/errata/RHSA-2021:4768
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Red Hat Security Advisory
Synopsis: Important: kernel security update
Advisory ID: RHSA-2021:4768-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:4768
Issue date: 2021-11-23
CVE Names: CVE-2020-36385 CVE-2021-3653
=====================================================================
1. Summary:
An update for kernel is now available for Red Hat Enterprise Linux 7.3
Advanced Update Support.
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 Server AUS (v. 7.3) - noarch, x86_64
Red Hat Enterprise Linux Server Optional AUS (v. 7.3) - x86_64
3. Description:
The kernel packages contain the Linux kernel, the core of any Linux
operating system.
Security Fix(es):
* kernel: use-after-free in drivers/infiniband/core/ucma.c ctx
use-after-free (CVE-2020-36385)
* kernel: SVM nested virtualization issue in KVM (AVIC support)
(CVE-2021-3653)
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.
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/):
1974319 - CVE-2020-36385 kernel: use-after-free in drivers/infiniband/core/ucma.c ctx use-after-free
1983686 - CVE-2021-3653 kernel: SVM nested virtualization issue in KVM (AVIC support)
6. Package List:
Red Hat Enterprise Linux Server AUS (v. 7.3):
Source:
kernel-3.10.0-514.95.1.el7.src.rpm
noarch:
kernel-abi-whitelists-3.10.0-514.95.1.el7.noarch.rpm
kernel-doc-3.10.0-514.95.1.el7.noarch.rpm
x86_64:
kernel-3.10.0-514.95.1.el7.x86_64.rpm
kernel-debug-3.10.0-514.95.1.el7.x86_64.rpm
kernel-debug-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
kernel-debug-devel-3.10.0-514.95.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.95.1.el7.x86_64.rpm
kernel-devel-3.10.0-514.95.1.el7.x86_64.rpm
kernel-headers-3.10.0-514.95.1.el7.x86_64.rpm
kernel-tools-3.10.0-514.95.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
kernel-tools-libs-3.10.0-514.95.1.el7.x86_64.rpm
perf-3.10.0-514.95.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
python-perf-3.10.0-514.95.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
Red Hat Enterprise Linux Server Optional AUS (v. 7.3):
x86_64:
kernel-debug-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
kernel-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
kernel-debuginfo-common-x86_64-3.10.0-514.95.1.el7.x86_64.rpm
kernel-tools-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
kernel-tools-libs-devel-3.10.0-514.95.1.el7.x86_64.rpm
perf-debuginfo-3.10.0-514.95.1.el7.x86_64.rpm
python-perf-debuginfo-3.10.0-514.95.1.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-2020-36385
https://access.redhat.com/security/cve/CVE-2021-3653
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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