RHEL 7 : kernel (RHSA-2019:1946)

high Nessus Plugin ID 127633
New! Plugin Severity Now Using CVSS v3

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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 7.4 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.

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es) :

* An industry-wide issue was found in the way many modern microprocessor designs have implemented speculative execution of instructions past bounds check. The flaw relies on the presence of a precisely-defined instruction sequence in the privileged code and the fact that memory writes occur to an address which depends on the untrusted value. Such writes cause an update into the microprocessor's data cache even for speculatively executed instructions that never actually commit (retire). As a result, an unprivileged attacker could use this flaw to influence speculative execution and/or read privileged memory by conducting targeted cache side-channel attacks.
(CVE-2018-3693)

* Kernel: kvm: nVMX: L2 guest could access hardware(L0) CR8 register (CVE-2017-12154)

* kernel: net: double-free and memory corruption in get_net_ns_by_id() (CVE-2017-15129)

* kernel: dereferencing NULL payload with nonzero length (CVE-2017-15274)

* kernel: stack-based buffer overflow in chap_server_compute_md5() in iscsi target (CVE-2018-14633)

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) :

* ovl_create can return positive retval and crash the host (BZ#1696290)

* THP: Race between MADV_DONTNEED and NUMA hinting node migration code (BZ# 1698105)

* RHEL7.6 - Kernel changes for count cache flush Spectre v2 mitigation (BZ# 1708543)

* Poor system performance from thundering herd of kworkers competing for mddev->flush_bio ownership (BZ#1712762)

* [RHEL7.7] RAID1 `write-behind` causes a kernel panic (BZ#1712999)

Enhancement(s) :

* [Intel 7.5 FEAT] i40evf - Update to latest upstream driver version (BZ# 1722774)

* [netdrv] i40e/i40evf: Fix use after free in Rx cleanup path [7.4.z] (BZ# 1723831)

Users of kernel are advised to upgrade to these updated packages, which fix these bugs and add these enhancements.

Solution

Update the affected packages.

See Also

https://access.redhat.com/solutions/3523601

https://access.redhat.com/errata/RHSA-2019:1946

https://access.redhat.com/security/cve/cve-2017-12154

https://access.redhat.com/security/cve/cve-2017-15129

https://access.redhat.com/security/cve/cve-2017-15274

https://access.redhat.com/security/cve/cve-2018-3693

https://access.redhat.com/security/cve/cve-2018-14633

Plugin Details

Severity: High

ID: 127633

File Name: redhat-RHSA-2019-1946.nasl

Version: 1.5

Type: local

Agent: unix

Published: 8/12/2019

Updated: 1/6/2020

Dependencies: ssh_get_info.nasl, linux_alt_patch_detect.nasl

Risk Information

CVSS Score Source: CVE-2018-14633

VPR

Risk Factor: Medium

Score: 5.2

CVSS v2

Risk Factor: High

Base Score: 8.3

Temporal Score: 6.1

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

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

CVSS v3

Risk Factor: High

Base Score: 7

Temporal Score: 6.1

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

Temporal Vector: E:U/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:7.4

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: 7/30/2019

Vulnerability Publication Date: 9/26/2017

Reference Information

CVE: CVE-2017-12154, CVE-2017-15129, CVE-2017-15274, CVE-2018-14633, CVE-2018-3693

RHSA: 2019:1946