{"id":"UBUNTU-CVE-2019-3887","details":"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.","modified":"2026-02-04T03:38:23.363908Z","published":"2019-04-09T00:00:00Z","related":["USN-3979-1","USN-3980-1","USN-3980-2"],"upstream":["CVE-2019-3887"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2019-3887"},{"type":"REPORT","url":"https://www.openwall.com/lists/oss-security/2019/04/08/1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3979-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3980-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3980-2"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2019-3887"}],"affected":[{"package":{"name":"linux-azure","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/linux-azure@4.18.0-1018.18~18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.18.0-1018.18~18.04.1"}]}],"versions":["4.15.0-1002.2","4.15.0-1003.3","4.15.0-1004.4","4.15.0-1008.8","4.15.0-1009.9","4.15.0-1012.12","4.15.0-1013.13","4.15.0-1014.14","4.15.0-1018.18","4.15.0-1019.19","4.15.0-1021.21","4.15.0-1022.23","4.15.0-1023.24","4.15.0-1025.26","4.15.0-1028.29","4.15.0-1030.31","4.15.0-1031.32","4.15.0-1032.33","4.15.0-1035.36","4.15.0-1036.38","4.15.0-1037.39","4.18.0-1011.11~18.04.1","4.18.0-1013.13~18.04.1","4.18.0-1014.14~18.04.1"],"ecosystem_specific":{"availability":"No 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