CVE-2019-3887 Information

Description

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 Vector

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

Reference

http://www.securityfocus.com/bid/107850 https://access.redhat.com/errata/RHSA-2019:2703 https://access.redhat.com/errata/RHSA-2019:2741 https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887 https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/ https://usn.ubuntu.com/3979-1/ https://usn.ubuntu.com/3980-1/ https://usn.ubuntu.com/3980-2/

Attack Complexity

HIGH

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

CHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

5.6