RHEL 7 : kernel-rt (RHSA-2019:0188)

high Nessus Plugin ID 121450
New! Plugin Severity Now Using CVSS v3

The calculated severity for Plugins has been updated to use CVSS v3 by default. Plugins that do not have a CVSS v3 score will fall back to CVSS v2 for calculating severity. Severity display preferences can be toggled in the settings dropdown.

Synopsis

The remote Red Hat host is missing one or more security updates.

Description

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.

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

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2019:0188

https://access.redhat.com/security/cve/cve-2018-18559

Plugin Details

Severity: High

ID: 121450

File Name: redhat-RHSA-2019-0188.nasl

Version: 1.7

Type: local

Agent: unix

Published: 1/30/2019

Updated: 2/20/2020

Dependencies: ssh_get_info.nasl, linux_alt_patch_detect.nasl

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Medium

Base Score: 6.8

Temporal Score: 5

Vector: AV:N/AC:M/Au:N/C:P/I:P/A:P

Temporal Vector: E:U/RL:OF/RC:C

CVSS v3

Risk Factor: High

Base Score: 8.1

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Temporal Vector: E:U/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:kernel-rt, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debug-kvm-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-rt-debuginfo-common-x86_64, p-cpe:/a:redhat:enterprise_linux:kernel-rt-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-doc, p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-kvm-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-devel, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm, p-cpe:/a:redhat:enterprise_linux:kernel-rt-trace-kvm-debuginfo, cpe:/o:redhat:enterprise_linux:7

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list, Host/cpu

Exploit Ease: No known exploits are available

Patch Publication Date: 1/29/2019

Vulnerability Publication Date: 10/22/2018

Reference Information

CVE: CVE-2018-18559

RHSA: 2019:0188