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Vulnerability record · CVE-2019-3887 · published 9 April 2019

CVE-2019-3887: Linux kernel incorrect authorization vulnerability

Linux · Linux Kernel

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.

5.6 CVSS 3.1 Medium EPSS 0.36% · top 72.7% CWE-863 · Incorrect authorization
5.6CVSS 3.1 base score, v2 4.7
0.36%EPSS exploitation probability, 30 days
NoNot in CISA KEV
11Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

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

Affected products

11 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/107850 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2703 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2741 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887 Issue TrackingPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMK
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/107850 Third Party AdvisoryVDB Entry
https://access.redhat.com/errata/RHSA-2019:2703 Third Party Advisory
https://access.redhat.com/errata/RHSA-2019:2741 Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-3887 Issue TrackingPatchThird Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMK
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

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Source: NIST National Vulnerability Database (record CVE-2019-3887), CISA KEV, FIRST EPSS (scores of 2026-10-05). This page is refreshed as NVD updates the record.