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

Synopsis:          Important: kpatch-patch security update
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
CVE Names:         CVE-2021-3609 CVE-2021-3715 CVE-2021-37576 
=====================================================================

1. Summary:

An update is now available for Red Hat Enterprise Linux 8.1 Extended 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 BaseOS EUS (v. 8.1) - ppc64le, 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: 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.

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/):

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

6. 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
kpatch-patch-4_18_0-147_43_1-1-8.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_43_1-debuginfo-1-8.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_43_1-debugsource-1-8.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_44_1-1-7.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_44_1-debuginfo-1-7.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_44_1-debugsource-1-7.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_48_1-1-4.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_48_1-debuginfo-1-4.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_48_1-debugsource-1-4.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_51_1-1-3.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_51_1-debuginfo-1-3.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_51_1-debugsource-1-3.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_51_2-1-2.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_51_2-debuginfo-1-2.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_51_2-debugsource-1-2.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_52_1-1-1.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_52_1-debuginfo-1-1.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_52_1-debugsource-1-1.el8_1.ppc64le.rpm

x86_64:
kpatch-patch-4_18_0-147_27_1-1-13.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_27_1-debuginfo-1-13.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_27_1-debugsource-1-13.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_32_1-1-11.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_32_1-debuginfo-1-11.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_32_1-debugsource-1-11.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_34_1-1-11.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_34_1-debuginfo-1-11.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_34_1-debugsource-1-11.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_38_1-1-10.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_38_1-debuginfo-1-10.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_38_1-debugsource-1-10.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_43_1-1-8.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_43_1-debuginfo-1-8.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_43_1-debugsource-1-8.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_44_1-1-7.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_44_1-debuginfo-1-7.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_44_1-debugsource-1-7.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_48_1-1-4.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_48_1-debuginfo-1-4.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_48_1-debugsource-1-4.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_51_1-1-3.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_51_1-debuginfo-1-3.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_51_1-debugsource-1-3.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_51_2-1-2.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_51_2-debuginfo-1-2.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_51_2-debugsource-1-2.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_52_1-1-1.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_52_1-debuginfo-1-1.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_52_1-debugsource-1-1.el8_1.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-2021-3609
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

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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