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AUSCERT External Security Bulletin Redistribution
ESB-2020.2504
kpatch-patch security update for RHEL 8
22 July 2020
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AusCERT Security Bulletin Summary
---------------------------------
Product: kpatch-patch
Publisher: Red Hat
Operating System: Red Hat Enterprise Linux Server 8
Red Hat Enterprise Linux WS/Desktop 8
Impact/Access: Access Privileged Data -- Existing Account
Reduced Security -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2020-10768 CVE-2020-10767 CVE-2020-10766
Reference: ESB-2020.2497
Original Bulletin:
https://access.redhat.com/errata/RHSA-2020:3073
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Red Hat Security Advisory
Synopsis: Important: kpatch-patch security update
Advisory ID: RHSA-2020:3073-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:3073
Issue date: 2020-07-21
CVE Names: CVE-2020-10766 CVE-2020-10767 CVE-2020-10768
=====================================================================
1. Summary:
An update for kpatch-patch is now available for Red Hat Enterprise Linux 8.
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 BaseOS (v. 8) - x86_64
3. Description:
This is a kernel live patch module which is automatically loaded by the RPM
post-install script to modify the code of a running kernel.
Security Fix(es):
* kernel: Rogue cross-process SSBD shutdown. Linux scheduler logical bug
allows an attacker to turn off the SSBD protection. (CVE-2020-10766)
* kernel: Indirect Branch Prediction Barrier is force-disabled when STIBP
is unavailable or enhanced IBRS is available. (CVE-2020-10767)
* kernel: Indirect branch speculation can be enabled after it was
force-disabled by the PR_SPEC_FORCE_DISABLE prctl command. (CVE-2020-10768)
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
5. Bugs fixed (https://bugzilla.redhat.com/):
1845840 - CVE-2020-10766 kernel: Rogue cross-process SSBD shutdown. Linux scheduler logical bug allows an attacker to turn off the SSBD protection.
1845867 - CVE-2020-10767 kernel: Indirect Branch Prediction Barrier is force-disabled when STIBP is unavailable or enhanced IBRS is available.
1845868 - CVE-2020-10768 kernel: Indirect branch speculation can be enabled after it was force-disabled by the PR_SPEC_FORCE_DISABLE prctl command.
6. Package List:
Red Hat Enterprise Linux BaseOS (v. 8):
Source:
kpatch-patch-4_18_0-193-1-5.el8.src.rpm
kpatch-patch-4_18_0-193_1_2-1-3.el8_2.src.rpm
kpatch-patch-4_18_0-193_6_3-1-2.el8_2.src.rpm
x86_64:
kpatch-patch-4_18_0-193-1-5.el8.x86_64.rpm
kpatch-patch-4_18_0-193-debuginfo-1-5.el8.x86_64.rpm
kpatch-patch-4_18_0-193-debugsource-1-5.el8.x86_64.rpm
kpatch-patch-4_18_0-193_1_2-1-3.el8_2.x86_64.rpm
kpatch-patch-4_18_0-193_1_2-debuginfo-1-3.el8_2.x86_64.rpm
kpatch-patch-4_18_0-193_1_2-debugsource-1-3.el8_2.x86_64.rpm
kpatch-patch-4_18_0-193_6_3-1-2.el8_2.x86_64.rpm
kpatch-patch-4_18_0-193_6_3-debuginfo-1-2.el8_2.x86_64.rpm
kpatch-patch-4_18_0-193_6_3-debugsource-1-2.el8_2.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-2020-10766
https://access.redhat.com/security/cve/CVE-2020-10767
https://access.redhat.com/security/cve/CVE-2020-10768
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 2020 Red Hat, Inc.
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