Incorrect Authorization Affecting kernel-rt-modules-extra package, versions <0:4.18.0-80.11.1.rt9.156.el8_0


Severity

Recommended
high

Based on Red Hat Enterprise Linux security rating.

Threat Intelligence

EPSS
0.05% (23rd percentile)

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  • Snyk IDSNYK-RHEL8-KERNELRTMODULESEXTRA-3471256
  • published26 Jul 2021
  • disclosed5 Apr 2019

Introduced: 5 Apr 2019

CVE-2019-3887  (opens in a new tab)
CWE-863  (opens in a new tab)

How to fix?

Upgrade RHEL:8 kernel-rt-modules-extra to version 0:4.18.0-80.11.1.rt9.156.el8_0 or higher.
This issue was patched in RHSA-2019:2741.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-modules-extra package and not the kernel-rt-modules-extra package as distributed by RHEL. See How to fix? for RHEL:8 relevant fixed versions and status.

A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister (MSR) access with nested(=1) virtualization enabled. In that, L1 guest could access L0's APIC register values via L2 guest, when 'virtualize x2APIC mode' is enabled. A guest could use this flaw to potentially crash the host kernel resulting in DoS issue. Kernel versions from 4.16 and newer are vulnerable to this issue.

CVSS Scores

version 3.1