CVE-2019-3887

Name: CVE-2019-3887
Creator: NVD / NIST
Published: 2019-04-09T16:29:01.99+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 5.6/10EPSS 0.36%

Last modified Jun 17, 2026

CVE-2019-3887 is a medium-severity vulnerability rated 5.6/10 on the CVSS scale. 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. EPSS estimates a 0.36% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.6/10

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:N/I:N/A:H

EPSS Probability

0.36%

27.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Linux	Linux Kernel	>= 4.16
Fedoraproject	Fedora	29
Canonical	Ubuntu Linux	18.04
Canonical	Ubuntu Linux	18.10
Canonical	Ubuntu Linux	19.04
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux Eus	8.1
Redhat	Enterprise Linux Eus	8.2
Redhat	Enterprise Linux Eus	8.4
Redhat	Enterprise Linux For Real Time	8
Redhat	Enterprise Linux For Real Time For Nfv	8
Redhat	Enterprise Linux For Real Time For Nfv Tus	8.2
Redhat	Enterprise Linux For Real Time For Nfv Tus	8.4
Redhat	Enterprise Linux For Real Time Tus	8.2
Redhat	Enterprise Linux For Real Time Tus	8.4
Redhat	Enterprise Linux Server Aus	8.2
Redhat	Enterprise Linux Server Aus	8.4
Redhat	Enterprise Linux Server Tus	8.2
Redhat	Enterprise Linux Server Tus	8.4

References

http://www.securityfocus.com/bid/107850Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2019:2703Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2741Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/
https://usn.ubuntu.com/3979-1/Third Party Advisory
https://usn.ubuntu.com/3980-1/Third Party Advisory
https://usn.ubuntu.com/3980-2/Third Party Advisory
http://www.securityfocus.com/bid/107850Third Party Advisory, VDB Entry
https://access.redhat.com/errata/RHSA-2019:2703Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2741Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887Issue Tracking, Patch, Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/
https://usn.ubuntu.com/3979-1/Third Party Advisory
https://usn.ubuntu.com/3980-1/Third Party Advisory
https://usn.ubuntu.com/3980-2/Third Party Advisory

Timeline

Published: Apr 9, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2019-3887?

How severe is CVE-2019-3887?

CVE-2019-3887 has a CVSS score of 5.6/10 (MEDIUM severity). The EPSS model estimates a 0.36% probability of exploitation in the next 30 days.

How do I fix CVE-2019-3887?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2019-3887?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST