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Red Hat Security Advisory
Synopsis: Moderate: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:0136-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0136
Issue date: 2021-01-14
CVE Names: CVE-2020-25641
=====================================================================
1. Summary:
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2
Extended Update Support.
Red Hat Product Security has rated this update as having a security impact
of Moderate. 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 Real Time EUS (v. 8.2) – x86_64
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2) – x86_64
3. Description:
The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
* kernel: soft-lockups in iov_iter_copy_from_user_atomic() could result in
DoS (CVE-2020-25641)
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.
Bug Fix(es):
* kernel-rt: update RT source tree to the latest RHEL-8.2.z6 Batch source
tree (BZ#1902783)
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
The system must be rebooted for this update to take effect.
5. Bugs fixed (https://bugzilla.redhat.com/):
1881424 – CVE-2020-25641 kernel: soft-lockups in iov_iter_copy_from_user_atomic() could result in DoS
6. Package List:
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.40.1.rt13.90.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-kvm-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.40.1.rt13.90.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.40.1.rt13.90.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.40.1.rt13.90.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-2020-25641
https://access.redhat.com/security/updates/classification/#moderate
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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