Issued:
2022-03-08
Updated:
2022-03-08

RHSA-2022:0771 - 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: Use After Free in unix_gc() which could result in a local privilege escalation (CVE-2021-0920)

  • kernel: use-after-free in RDMA listen() (CVE-2021-4028)

  • kernel: possible privileges escalation due to missing TLB flush (CVE-2022-0330)

  • kernel: remote stack overflow via kernel panic on systems using TIPC may lead to DoS (CVE-2022-0435)

  • kernel: failing usercopy allows for use-after-free exploitation (CVE-2022-22942)

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.z7 source tree (BZ#2042461)

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-debug-core-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debug-devel-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debug-kvm-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-kvm-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-4.18.0-305.40.1.rt7.112.el8_4.src.rpm
  • kernel-rt-core-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debuginfo-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debug-modules-extra-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-modules-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debug-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-modules-extra-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debug-debuginfo-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-devel-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm
  • kernel-rt-debug-modules-4.18.0-305.40.1.rt7.112.el8_4.x86_64.rpm

Fixes

CVEs

References

Additional information