Issued:
2021-03-09
Updated:
2021-03-09

RHSA-2021:0774 - Important: kernel-rt security and bug fix update

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory Important

Topic

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.

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)

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.

Affected Products

ProductVersionArch
Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service8.2x86_64
Red Hat Enterprise Linux for Real Time - Telecommunications Update Service8.2x86_64

Updated Packages

  • kernel-rt-debug-modules-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-debug-devel-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-modules-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-debug-core-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
  • kernel-rt-4.18.0-193.46.1.rt13.96.el8_2.src.rpm
  • kernel-rt-debug-modules-extra-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-debuginfo-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm
  • kernel-rt-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
  • kernel-rt-debug-kvm-4.18.0-193.46.1.rt13.96.el8_2.x86_64.rpm

Fixes

CVEs

References

Additional information