What’s Vulnerable › Vulnerabilities

CVE-2019-3887

• Severity: medium (CVSS 5.6 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-04-09 · updated 2026-06-17
• Weakness: CWE-863

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.

Affected products

• Canonical Ubuntu Linux: 18.04, 18.10, 19.04
• Fedoraproject Fedora: 29
• Linux kernel: from 4.16
• Red Hat Enterprise Linux: 8.0
• RedHat Enterprise Linux Eus: 8.1, 8.2, 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, 8.4
• RedHat Enterprise Linux For Real Time Tus: 8.2, 8.4
• RedHat Enterprise Linux Server Aus: 8.2, 8.4
• RedHat Enterprise Linux Server Tus: 8.2, 8.4

References

• 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%40lists.fedoraproject.org/message/IWPOIII2L73HV5PGXSGMRMKQIK47UIYE/
• https://usn.ubuntu.com/3979-1/
• https://usn.ubuntu.com/3980-1/
• https://usn.ubuntu.com/3980-2/
• 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

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