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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.

🗓️ 25 Sep 2020 07:00:00Reported by MicrosoftType 
mscve
 mscve🔗 msrc.microsoft.com👁 2 Views

KVM flaw enables Level One guest to access L0 APIC via Level Two with nested x2APIC, risking host kernel crash and denial of service on kernels four point sixteen and newer.

Related
Detection
ReporterTitlePublishedViews
Family
CBLMariner		CVE-2019-3887 affecting package kernel for versions less than 6.6.35.1-4
14 Aug 202420:43
–cbl_mariner
CBLMariner		CVE-2019-3887 affecting package kernel 5.10.189.1-1
9 Sep 202115:03
–cbl_mariner
CBLMariner		CVE-2019-3887 affecting package kernel for versions less than 5.10.78.1-1
9 Apr 202206:52
–cbl_mariner
Tenable Nessus		CentOS 8 : kernel (CESA-2019:2703)
29 Jan 202100:00
–nessus
Tenable Nessus		Fedora 29 : kernel / kernel-headers / kernel-tools (2019-94dc902948)
15 Apr 201900:00
–nessus
Tenable Nessus		Fedora 30 : kernel / kernel-headers / kernel-tools (2019-982b97f553)
2 May 201900:00
–nessus
Tenable Nessus		Fedora 28 : kernel / kernel-headers / kernel-tools (2019-ce2933b003)
15 Apr 201900:00
–nessus
Tenable Nessus		Oracle Linux 8 : kernel (ELSA-2019-2703)
16 Sep 201900:00
–nessus
Tenable Nessus		Photon OS 3.0: Linux PHSA-2019-3.0-0015
24 Jun 201900:00
–nessus
Tenable Nessus		Photon OS 3.0: Linux PHSA-2020-3.0-0118
24 Jul 202400:00
–nessus
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19 Feb 2026 09:08Current
7High risk
Vulners AI Score7
CVSS 24.7
CVSS 3.15.6
CVSS 36.7
EPSS0.00035
nested virtualizationx2APIC modemachine specific registerlevel one guestlevel two guesthost kernel crashdenial of servicelinux kernelfour point sixteen
2