RHEL 7 : kernel (RHSA-2019:0202)

Low Nessus Plugin ID 121453

Synopsis

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

Description

An update for kernel is now available for Red Hat Enterprise Linux 7.5 Extended Update Support.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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 packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* kernel: userfaultfd bypasses tmpfs file permissions (CVE-2018-18397)

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) :

* When applying two instances of the kprobe debugging mechanism to the same function, one of the kprobes in some cases failed, depending on the kernel address space layout. Consequently, a kprobe registration error occurred. This update fixes the bug in the kprobes registration code to properly detect and handle ftrace-based kprobes. As a result, both kprobes now apply successfully in the described scenario.
(BZ#1647815)

* Under heavy mad packet load, the SELinux checks in the mad packet queries for InfiniBand (IB) fabrics significantly increased the mad packet execution time. Consequently, if a single machine was executing a large perfquery to the IB switches of a High Performance (HPC) fabric, mad_rpc timeouts occurred, and the query failed even with SELinux disabled. This update eliminates the SELinux checks when SELinux is disabled. As a result, the mad packet queries through perfquery now have their original run times when SELinux is disabled.
(BZ#1648810)

* Previously, a file-system shutdown process caused by an I/O error could race against a running fstrim process to acquire a xfs buffer lock. Consequently, the file-system shutdown process never completed due to a deadlock and the file-system became unresponsive, unable to be unmounted. This update fixes the lock ordering so that the deadlock no longer occurs and the file-system shutdown process now completes in the described scenario. (BZ#1657142)

Solution

Update the affected packages.

See Also

https://access.redhat.com/errata/RHSA-2019:0202

https://access.redhat.com/security/cve/cve-2018-18397

Plugin Details

Severity: Low

ID: 121453

File Name: redhat-RHSA-2019-0202.nasl

Version: 1.8

Type: local

Agent: unix

Published: 2019/01/30

Updated: 2019/10/24

Dependencies: 12634, 122878

Risk Information

Risk Factor: Low

CVSS v2.0

Base Score: 2.1

Temporal Score: 1.6

Vector: CVSS2#AV:L/AC:L/Au:N/C:N/I:P/A:N

Temporal Vector: CVSS2#E:POC/RL:OF/RC:C

CVSS v3.0

Base Score: 5.5

Temporal Score: 5

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

Temporal Vector: CVSS:3.0/E:P/RL:O/RC:C

Vulnerability Information

CPE: p-cpe:/a:redhat:enterprise_linux:kernel, p-cpe:/a:redhat:enterprise_linux:kernel-abi-whitelists, p-cpe:/a:redhat:enterprise_linux:kernel-debug, p-cpe:/a:redhat:enterprise_linux:kernel-debug-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-debug-devel, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-s390x, p-cpe:/a:redhat:enterprise_linux:kernel-debuginfo-common-x86_64, p-cpe:/a:redhat:enterprise_linux:kernel-devel, p-cpe:/a:redhat:enterprise_linux:kernel-doc, p-cpe:/a:redhat:enterprise_linux:kernel-headers, p-cpe:/a:redhat:enterprise_linux:kernel-kdump, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-kdump-devel, p-cpe:/a:redhat:enterprise_linux:kernel-tools, p-cpe:/a:redhat:enterprise_linux:kernel-tools-debuginfo, p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs, p-cpe:/a:redhat:enterprise_linux:kernel-tools-libs-devel, p-cpe:/a:redhat:enterprise_linux:perf, p-cpe:/a:redhat:enterprise_linux:perf-debuginfo, p-cpe:/a:redhat:enterprise_linux:python-perf, p-cpe:/a:redhat:enterprise_linux:python-perf-debuginfo, cpe:/o:redhat:enterprise_linux:7.5

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

Exploit Available: true

Exploit Ease: Exploits are available

Patch Publication Date: 2019/01/29

Vulnerability Publication Date: 2018/12/12

Reference Information

CVE: CVE-2018-18397

RHSA: 2019:0202