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

Severity

 Recommended
high

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.05% (22nd percentile)

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  • Snyk ID SNYK-CENTOS8-KERNELRTKVM-1990863
  • published 26 Jul 2021
  • disclosed 5 Apr 2019
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Introduced: 5 Apr 2019

CVE-2019-3887 Open this link in a new tab
CWE-863 Open this link in a new tab

How to fix?

Upgrade Centos:8 kernel-rt-kvm to version 0:4.18.0-80.11.1.rt9.156.el8_0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-rt-kvm package and not the kernel-rt-kvm package as distributed by Centos. See How to fix? for Centos: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
Expand this section

NVD

5.6 medium
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    High
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Changed
  • Confidentiality (C)
    None
  • Integrity (I)
    None
  • Availability (A)
    High