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Red Hat Enterprise Linux 8: RHSA-2020-3073-01 Important kpatch-Patch Update

red hat
Calendar Grey July 21, 2020
Dist Redhat Esm H88
Red Hat Enterprise Linux 8 has launched a vital kpatch-patch update, enhancing system security and offering real-time kernel patching to reduce downtime
An update for kpatch-patch is now available for Red Hat Enterprise Linux 8

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

Summary

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.

Topics%20covered

Topics Covered

security advisory kernel update Red Hat Enterprise Linux important security impact kpatch-patch cross-process attack

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

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/


Severity
important
Lowest
Low
Medium
High
Critical

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

Topic

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 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 kernel update Red Hat Enterprise Linux important security impact kpatch-patch cross-process attack

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS (v. 8) - x86_64

Bugs Fixed

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.

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