A kernel-rt security and bug fix update has been released for Red Hat Enterprise Linux 8.2.
RHSA-2021:0774-01: Important: kernel-rt security and bug fix update
=====================================================================
Red Hat Security Advisory
Synopsis: Important: kernel-rt security and bug fix update
Advisory ID: RHSA-2021:0774-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:0774
Issue date: 2021-03-09
Cross references: CVE-2020-0444, CVE-2020-14351, CVE-2020-25211, CVE-2020-25705, CVE-2020-29661
CVE Names: CVE-2020-0444 CVE-2020-14351 CVE-2020-25211
CVE-2020-25705 CVE-2020-29661
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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 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 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: bad kfree in auditfilter.c may lead to escalation of privilege
(CVE-2020-0444)
* kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in
net/netfilter/nf_conntrack_netlink.c (CVE-2020-25211)
* kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an
use-after-free (CVE-2020-29661)
* kernel: performance counters race condition use-after-free
(CVE-2020-14351)
* kernel: ICMP rate limiting can be used for DNS poisoning attack
(CVE-2020-25705)
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.z7 Batch source
tree (BZ#1915947)
* kernel-rt possible livelock: WARNING: CPU: 28 PID: 3109 at
kernel/ptrace.c:242 ptrace_check_attach+0xdd/0x1a0 (BZ#1925309)
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/):
1862849 - CVE-2020-14351 kernel: performance counters race condition use-after-free
1877571 - CVE-2020-25211 kernel: Local buffer overflow in ctnetlink_parse_tuple_filter in net/netfilter/nf_conntrack_netlink.c
1894579 - CVE-2020-25705 kernel: ICMP rate limiting can be used for DNS poisoning attack
1906525 - CVE-2020-29661 kernel: locking issue in drivers/tty/tty_jobctrl.c can lead to an use-after-free
1915947 - kernel-rt: update RT source tree to the latest RHEL-8.2.z7 Batch source tree
1920474 - CVE-2020-0444 kernel: bad kfree in auditfilter.c may lead to escalation of privilege
6. Package List:
Red Hat Enterprise Linux Real Time for NFV EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.46.1.rt13.96.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-kvm-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-kvm-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
Red Hat Enterprise Linux Real Time EUS (v. 8.2):
Source:
kernel-rt-4.18.0-193.46.1.rt13.96.el8_2.src.rpm
x86_64:
kernel-rt-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-core-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-core-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-debuginfo-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-devel-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-modules-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debug-modules-extra-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debuginfo-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-devel-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-modules-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
kernel-rt-modules-extra-4.18.0-193.46.1.rt13.96.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-2020-0444
https://access.redhat.com/security/cve/CVE-2020-14351
https://access.redhat.com/security/cve/CVE-2020-25211
https://access.redhat.com/security/cve/CVE-2020-25705
https://access.redhat.com/security/cve/CVE-2020-29661
https://access.redhat.com/security/updates/classification/#important
8. Contact:
The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.
