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Red Hat Security Advisory

Synopsis: Important: kpatch-patch security update
Advisory ID: RHSA-2020:2669-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2020:2669
Issue date: 2020-06-23
CVE Names: CVE-2020-12657
=====================================================================

1. Summary:

An update for kpatch-patch 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: use-after-free in block/bfq-iosched.c related to
bfq_idle_slice_timer_body (CVE-2020-12657)

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/):

1832866 – CVE-2020-12657 kernel: use-after-free in block/bfq-iosched.c related to bfq_idle_slice_timer_body

6. Package List:

Red Hat Enterprise Linux BaseOS EUS (v. 8.1):

Source:
kpatch-patch-4_18_0-147-1-14.el8.src.rpm
kpatch-patch-4_18_0-147_0_2-1-10.el8.src.rpm
kpatch-patch-4_18_0-147_0_3-1-10.el8.src.rpm
kpatch-patch-4_18_0-147_13_2-1-1.el8_1.src.rpm
kpatch-patch-4_18_0-147_3_1-1-10.el8_1.src.rpm
kpatch-patch-4_18_0-147_5_1-1-5.el8_1.src.rpm
kpatch-patch-4_18_0-147_8_1-1-3.el8_1.src.rpm

ppc64le:
kpatch-patch-4_18_0-147-1-14.el8.ppc64le.rpm
kpatch-patch-4_18_0-147-debuginfo-1-14.el8.ppc64le.rpm
kpatch-patch-4_18_0-147-debugsource-1-14.el8.ppc64le.rpm
kpatch-patch-4_18_0-147_0_2-1-10.el8.ppc64le.rpm
kpatch-patch-4_18_0-147_0_2-debuginfo-1-10.el8.ppc64le.rpm
kpatch-patch-4_18_0-147_0_2-debugsource-1-10.el8.ppc64le.rpm
kpatch-patch-4_18_0-147_0_3-1-10.el8.ppc64le.rpm
kpatch-patch-4_18_0-147_13_2-1-1.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_13_2-debuginfo-1-1.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_13_2-debugsource-1-1.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_3_1-1-10.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_5_1-1-5.el8_1.ppc64le.rpm
kpatch-patch-4_18_0-147_8_1-1-3.el8_1.ppc64le.rpm

x86_64:
kpatch-patch-4_18_0-147-1-14.el8.x86_64.rpm
kpatch-patch-4_18_0-147-debuginfo-1-14.el8.x86_64.rpm
kpatch-patch-4_18_0-147-debugsource-1-14.el8.x86_64.rpm
kpatch-patch-4_18_0-147_0_2-1-10.el8.x86_64.rpm
kpatch-patch-4_18_0-147_0_2-debuginfo-1-10.el8.x86_64.rpm
kpatch-patch-4_18_0-147_0_2-debugsource-1-10.el8.x86_64.rpm
kpatch-patch-4_18_0-147_0_3-1-10.el8.x86_64.rpm
kpatch-patch-4_18_0-147_13_2-1-1.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_13_2-debuginfo-1-1.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_13_2-debugsource-1-1.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_3_1-1-10.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_5_1-1-5.el8_1.x86_64.rpm
kpatch-patch-4_18_0-147_8_1-1-3.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-2020-12657
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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