Issued:
2019-01-29
Updated:
2019-01-29

RHSA-2019:0188 - 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 7.

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 due to race condition in AF_PACKET implementation (CVE-2018-18559)

For more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.

Bug Fix(es):

  • The kernel-rt packages have been upgraded to the 3.10.0-957.5.1 source tree, which provides a number of bug fixes over the previous version. (BZ#1653822)

  • Under certain circumstances, the following warning message, which indicated a SCHED_DEADLINE bandwidth tracking mechanism error, occurred:

WARNING: CPU: 8 PID: 19536 at kernel/sched/deadline.c:64 dequeue_task_dl+0x121/0x140

This update fixes the sched_setscheduler() core kernel function, and backports multiple upstream patches to the SCHED_DEADLINE scheduler. As a result, the SCHED_DEADLINE bandwidth tracking mechanism is prevented from error conditions, and the warning message no longer occurs. (BZ#1655439)

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 Time7x86_64
Red Hat Enterprise Linux for Real Time for x86_64 - Extended Life Cycle Support7x86_64
Red Hat Enterprise Linux for Real Time for NFV7x86_64

Updated Packages

  • kernel-rt-trace-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-3.10.0-957.5.1.rt56.916.el7.src.rpm
  • kernel-rt-debug-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-trace-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-debug-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-debug-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-trace-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-devel-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-doc-3.10.0-957.5.1.rt56.916.el7.noarch.rpm
  • kernel-rt-debug-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-debuginfo-common-x86_64-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-debug-kvm-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-trace-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-trace-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-kvm-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm
  • kernel-rt-debuginfo-3.10.0-957.5.1.rt56.916.el7.x86_64.rpm

Fixes

CVEs

References

Additional information