CVE-2019-3887· NVD / CVE Program· CNA redhat

A flaw was found in the way KVM hypervisor handled x2APIC Machine Specific Rregister (MSR) access with nested(=1) virtualization enabled.

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.

MediumCVSS 5.6 · v3.1—No exploit Fix available

Published: Apr 9, 2019
Updated: Jun 16, 2026
EPSS: 0.4% · 27th percentile
CWE: CWE-863

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Action score

Monitor

Low priority for now.

CVSS: 22 / 40 · 5.6 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.4%

CNA vs NVD score

NVD: 5.6
CNA · redhat: 6.7; 1.1 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Noroxi analysis

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Affected systems

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora
canonical	ubuntu linux	cpe:2.3:o:canonical:ubuntu_linux
redhat	enterprise linux	cpe:2.3:o:redhat:enterprise_linux
redhat	enterprise linux eus	cpe:2.3:o:redhat:enterprise_linux_eus
redhat	enterprise linux for real time	cpe:2.3:o:redhat:enterprise_linux_for_real_time
redhat	enterprise linux for real time for nfv	cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv
redhat	enterprise linux for real time for nfv tus	cpe:2.3:o:redhat:enterprise_linux_for_real_time_for_nfv_tus
redhat	enterprise linux for real time tus	cpe:2.3:o:redhat:enterprise_linux_for_real_time_tus
redhat	enterprise linux server aus	cpe:2.3:o:redhat:enterprise_linux_server_aus
redhat	enterprise linux server tus	cpe:2.3:o:redhat:enterprise_linux_server_tus

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

canonical ubuntu linux18.04
canonical ubuntu linux18.10
canonical ubuntu linux19.04
fedoraproject fedora29
linux linux kernel4.16 and later
redhat enterprise linux8.0
redhat enterprise linux eus8.1
redhat enterprise linux eus8.2
redhat enterprise linux eus8.4
redhat enterprise linux for real time8
redhat enterprise linux for real time for nfv8
redhat enterprise linux for real time for nfv tus8.2
redhat enterprise linux for real time for nfv tus8.4
redhat enterprise linux for real time tus8.2
redhat enterprise linux for real time tus8.4
redhat enterprise linux server aus8.2
redhat enterprise linux server aus8.4
redhat enterprise linux server tus8.2
redhat enterprise linux server tus8.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

The Linux Foundation Kernel
- from 4.16affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 4.19.37-1	4.19.37-1
Red Hat:enterprise_linux:8::baseos	bpftool	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	bpftool-debuginfo	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-abi-whitelists	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-core	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-cross-headers	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debug	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debug-core	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debug-debuginfo	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debug-devel	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debug-modules	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debug-modules-extra	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-aarch64	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-ppc64le	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-s390x	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-debuginfo-common-x86_64	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-devel	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-doc	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-headers	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-modules	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-modules-extra	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0
Red Hat:enterprise_linux:8::baseos	kernel-tools	before 0:4.18.0-80.11.1.el8_0	0:4.18.0-80.11.1.el8_0

+30

Same product

linux: all records

Other highest-scoring records for the same primary product.

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Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
debian:linux	4.19.37-1 · Debian:12	Package registry (OSV)
red hat:bpftool	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:bpftool-debuginfo	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-abi-whitelists	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-core	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-cross-headers	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-core	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-debuginfo	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-devel	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-modules	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)
red hat:kernel-debug-modules-extra	0:4.18.0-80.11.1.el8_0 · Red Hat:enterprise_linux:8::baseos	Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Someone with local access to the system can trigger it.
A low-privileged account is enough.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: none
Integrity: none
Availability: high · the service can be disrupted

Impact can extend beyond the vulnerable component (scope changes).

Attack vector: Local
Attack complexity: High
Privileges required: Low
User interaction: None
Scope: Changed
Confidentiality impact: None
Integrity impact: None
Availability impact: High

Weakness class (CWE)

CWE-863 · Incorrect Authorization

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

Fix✗ → ✓Sep 28, 2026, 10:47 PM UTC

For records you follow, these changes also arrive as notifications. →

References

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

No Noroxi analysis for this record yet

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Data sources and verification

CNA: redhat

CVE.org (CNA)Aug 4, 2024, 7:19 PM UTC
NVDJun 16, 2026, 10:35 PM UTC
FIRST EPSSOct 6, 2026, 12:00 AM UTC
OSV / GHSAOct 7, 2026, 3:22 AM UTC

Each line is when that source was last processed for this record.

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