Issued:
2022-07-19
Updated:
2022-07-19

RHSA-2022:5633 - 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 8.4 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: Small table perturb size in the TCP source port generation algorithm can lead to information leak (CVE-2022-1012)

  • kernel: race condition in perf_event_open leads to privilege escalation (CVE-2022-1729)

  • kernel: a use-after-free write in the netfilter subsystem can lead to privilege escalation to root (CVE-2022-32250)

  • kernel: cgroup: Use open-time creds and namespace for migration perm checks (CVE-2021-4197)

  • kernel: Race condition in races in sk_peer_pid and sk_peer_cred accesses (CVE-2021-4203)

  • kernel: the copy-on-write implementation can grant unintended write access because of a race condition in a THP mapcount check (CVE-2020-29368)

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 RHEL-8.4.z10 source tree (BZ#2087922)

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 x86_64 - Extended Update Support Extension8.4x86_64
Red Hat Enterprise Linux for Real Time for NFV - Telecommunications Update Service8.4x86_64
Red Hat Enterprise Linux for Real Time - Telecommunications Update Service8.4x86_64

Updated Packages

  • kernel-rt-debuginfo-common-x86_64-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debug-modules-extra-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debug-kvm-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debug-devel-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-devel-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-kvm-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debug-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debug-core-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-core-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-4.18.0-305.57.1.rt7.129.el8_4.src.rpm
  • kernel-rt-modules-extra-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debug-modules-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debuginfo-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-debug-debuginfo-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm
  • kernel-rt-modules-4.18.0-305.57.1.rt7.129.el8_4.x86_64.rpm

Fixes

CVEs

References

Additional information