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Red Hat Enterprise Linux 8.1 RHSA-2021-3442 Important Kpatch Threats

red hat
Calendar Grey September 7, 2021
Dist Redhat Esm H88
Update on security concerns for Red Hat Enterprise Linux 8.1 focusing on critical vulnerabilities and risks associated with kpatch-patch.
An update is now available for Red Hat Enterprise Linux 8.1 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

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: race condition in net/can/bcm.c leads to local privilege escalation (CVE-2021-3609)
* kernel: use-after-free in route4_change() in net/sched/cls_route.c (CVE-2021-3715)
* kernel: powerpc: KVM guest OS users can cause host OS memory corruption (CVE-2021-37576)
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 Red Hat Enterprise Linux threat important kernel local escalation kpatch-patch

References

https://access.redhat.com/security/cve/CVE-2021-3609 https://access.redhat.com/security/cve/CVE-2021-3715 https://access.redhat.com/security/cve/CVE-2021-37576 https://access.redhat.com/security/updates/classification/#important

Package List

Red Hat Enterprise Linux BaseOS EUS (v. 8.1):
Source: kpatch-patch-4_18_0-147_27_1-1-13.el8_1.src.rpm kpatch-patch-4_18_0-147_32_1-1-11.el8_1.src.rpm kpatch-patch-4_18_0-147_34_1-1-11.el8_1.src.rpm kpatch-patch-4_18_0-147_38_1-1-10.el8_1.src.rpm kpatch-patch-4_18_0-147_43_1-1-8.el8_1.src.rpm kpatch-patch-4_18_0-147_44_1-1-7.el8_1.src.rpm kpatch-patch-4_18_0-147_48_1-1-4.el8_1.src.rpm kpatch-patch-4_18_0-147_51_1-1-3.el8_1.src.rpm kpatch-patch-4_18_0-147_51_2-1-2.el8_1.src.rpm kpatch-patch-4_18_0-147_52_1-1-1.el8_1.src.rpm
ppc64le: kpatch-patch-4_18_0-147_27_1-1-13.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_27_1-debuginfo-1-13.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_27_1-debugsource-1-13.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_32_1-1-11.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_32_1-debuginfo-1-11.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_32_1-debugsource-1-11.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_34_1-1-11.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_34_1-debuginfo-1-11.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_34_1-debugsource-1-11.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_38_1-1-10.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_38_1-debuginfo-1-10.el8_1.ppc64le.rpm kpatch-patch-4_18_0-147_38_1-debugsource-1-10.el8_1.ppc64le.rpm

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

Advisory ID: RHSA-2021:3442-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:3442
Issue date: 2021-09-07

Topic

An update is now available for Red Hat Enterprise Linux 8.1 Extended UpdateSupport.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 Red Hat Enterprise Linux threat important kernel local escalation kpatch-patch

Relevant Releases Architectures

Red Hat Enterprise Linux BaseOS EUS (v. 8.1) - ppc64le, x86_64

Bugs Fixed

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

1986506 - CVE-2021-37576 kernel: powerpc: KVM guest OS users can cause host OS memory corruption

1993988 - CVE-2021-3715 kernel: use-after-free in route4_change() in net/sched/cls_route.c

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