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Red Hat 8.2 RHSA-2021-0774 Important: Kernel-Rt Security Fix for DoS

red hat
Calendar Grey March 9, 2021
Scroller Redhat
A new Kernel-rt security patch has been launched for Red Hat Enterprise Linux 8.2 targeting critical vulnerabilities and issues.
An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2 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

The system must be rebooted for this update to take effect.

Summary

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)

Topics%20covered

Topics Covered

security advisory Red Hat buffer overflow privilege escalation DoS attack DoS Red Hat Enterprise Linux important update important security fix kernel-rt kernel-rt update

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

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

Read the Full Advisory


Severity
important
Lowest
Low
Medium
High
Critical

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

Topic

An update for kernel-rt is now available for Red Hat Enterprise Linux 8.2Extended Update Support.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 buffer overflow privilege escalation DoS attack DoS Red Hat Enterprise Linux important update important security fix kernel-rt kernel-rt update

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

Bugs Fixed

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

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