{"id":"UBUNTU-CVE-2021-4147","details":"A flaw was found in the libvirt libxl driver. A malicious guest could continuously reboot itself and cause libvirtd on the host to deadlock or crash, resulting in a denial of service condition.","modified":"2026-08-20T05:27:17.929869082Z","published":"2022-03-25T19:15:00Z","related":["USN-5399-1","USN-8652-1"],"upstream":["CVE-2021-4147"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-4147"},{"type":"REPORT","url":"https://listman.redhat.com/archives/libvir-list/2021-November/msg00908.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5399-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-4147"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8652-1"}],"affected":[{"package":{"name":"libvirt","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.1.1-0ubuntu8","1.1.1-0ubuntu9","1.1.4-0ubuntu2","1.1.4-0ubuntu3","1.1.4-0ubuntu4","1.1.4-0ubuntu5","1.2.0-0ubuntu1","1.2.0-0ubuntu2","1.2.0-0ubuntu3","1.2.1-0ubuntu1","1.2.1-0ubuntu2","1.2.1-0ubuntu3","1.2.1-0ubuntu4","1.2.1-0ubuntu5","1.2.1-0ubuntu7","1.2.1-0ubuntu8","1.2.1-0ubuntu9","1.2.1-0ubuntu10","1.2.2-0ubuntu1","1.2.2-0ubuntu2","1.2.2-0ubuntu3","1.2.2-0ubuntu4","1.2.2-0ubuntu5","1.2.2-0ubuntu6","1.2.2-0ubuntu7","1.2.2-0ubuntu8","1.2.2-0ubuntu9","1.2.2-0ubuntu10","1.2.2-0ubuntu11","1.2.2-0ubuntu12","1.2.2-0ubuntu13","1.2.2-0ubuntu13.1","1.2.2-0ubuntu13.1.1","1.2.2-0ubuntu13.1.2","1.2.2-0ubuntu13.1.4","1.2.2-0ubuntu13.1.5","1.2.2-0ubuntu13.1.6","1.2.2-0ubuntu13.1.7","1.2.2-0ubuntu13.1.8","1.2.2-0ubuntu13.1.9","1.2.2-0ubuntu13.1.10","1.2.2-0ubuntu13.1.12","1.2.2-0ubuntu13.1.14","1.2.2-0ubuntu13.1.16","1.2.2-0ubuntu13.1.17","1.2.2-0ubuntu13.1.20","1.2.2-0ubuntu13.1.21","1.2.2-0ubuntu13.1.22","1.2.2-0ubuntu13.1.23","1.2.2-0ubuntu13.1.25","1.2.2-0ubuntu13.1.26","1.2.2-0ubuntu13.1.27","1.2.2-0ubuntu13.1.28","1.2.2-0ubuntu13.1.28+esm1","1.2.2-0ubuntu13.1.28+esm2"],"ecosystem_specific":{"binaries":[{"binary_version":"1.2.2-0ubuntu13.1.28+esm2","binary_name":"libvirt-bin"},{"binary_name":"libvirt0","binary_version":"1.2.2-0ubuntu13.1.28+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4147.json"}},{"package":{"name":"libvirt","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.3.1-1ubuntu10.31+esm1"}]}],"versions":["1.2.16-2ubuntu11","1.2.16-2ubuntu12","1.2.16-2ubuntu13","1.2.16-2ubuntu14","1.2.21-2ubuntu1","1.2.21-2ubuntu3","1.2.21-2ubuntu4","1.2.21-2ubuntu5","1.2.21-2ubuntu7","1.2.21-2ubuntu8","1.2.21-2ubuntu9","1.2.21-2ubuntu10","1.3.1-1ubuntu1","1.3.1-1ubuntu2","1.3.1-1ubuntu3","1.3.1-1ubuntu4","1.3.1-1ubuntu6","1.3.1-1ubuntu9","1.3.1-1ubuntu10","1.3.1-1ubuntu10.1","1.3.1-1ubuntu10.2","1.3.1-1ubuntu10.3","1.3.1-1ubuntu10.5","1.3.1-1ubuntu10.6","1.3.1-1ubuntu10.7","1.3.1-1ubuntu10.8","1.3.1-1ubuntu10.10","1.3.1-1ubuntu10.11","1.3.1-1ubuntu10.12","1.3.1-1ubuntu10.13","1.3.1-1ubuntu10.14","1.3.1-1ubuntu10.15","1.3.1-1ubuntu10.17","1.3.1-1ubuntu10.18","1.3.1-1ubuntu10.19","1.3.1-1ubuntu10.21","1.3.1-1ubuntu10.22","1.3.1-1ubuntu10.23","1.3.1-1ubuntu10.24","1.3.1-1ubuntu10.25","1.3.1-1ubuntu10.26","1.3.1-1ubuntu10.27","1.3.1-1ubuntu10.29","1.3.1-1ubuntu10.30","1.3.1-1ubuntu10.31"],"ecosystem_specific":{"binaries":[{"binary_name":"libvirt-bin","binary_version":"1.3.1-1ubuntu10.31+esm1"},{"binary_name":"libvirt0","binary_version":"1.3.1-1ubuntu10.31+esm1"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4147.json"}},{"package":{"name":"libvirt","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libvirt?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.0-1ubuntu8.21"}]}],"versions":["3.6.0-1ubuntu5","3.6.0-1ubuntu6","4.0.0-1ubuntu1","4.0.0-1ubuntu2","4.0.0-1ubuntu3","4.0.0-1ubuntu4","4.0.0-1ubuntu5","4.0.0-1ubuntu6","4.0.0-1ubuntu7","4.0.0-1ubuntu8","4.0.0-1ubuntu8.1","4.0.0-1ubuntu8.2","4.0.0-1ubuntu8.3","4.0.0-1ubuntu8.4","4.0.0-1ubuntu8.5","4.0.0-1ubuntu8.6","4.0.0-1ubuntu8.7","4.0.0-1ubuntu8.8","4.0.0-1ubuntu8.9","4.0.0-1ubuntu8.10","4.0.0-1ubuntu8.11","4.0.0-1ubuntu8.12","4.0.0-1ubuntu8.13","4.0.0-1ubuntu8.14","4.0.0-1ubuntu8.15","4.0.0-1ubuntu8.16","4.0.0-1ubuntu8.17","4.0.0-1ubuntu8.19","4.0.0-1ubuntu8.20"],"ecosystem_specific":{"binaries":[{"binary_version":"4.0.0-1ubuntu8.21","binary_name":"libnss-libvirt"},{"binary_name":"libvirt-bin","binary_version":"4.0.0-1ubuntu8.21"},{"binary_name":"libvirt-clients","binary_version":"4.0.0-1ubuntu8.21"},{"binary_version":"4.0.0-1ubuntu8.21","binary_name":"libvirt-daemon"},{"binary_name":"libvirt-daemon-driver-storage-gluster","binary_version":"4.0.0-1ubuntu8.21"},{"binary_name":"libvirt-daemon-driver-storage-rbd","binary_version":"4.0.0-1ubuntu8.21"},{"binary_name":"libvirt-daemon-driver-storage-sheepdog","binary_version":"4.0.0-1ubuntu8.21"},{"binary_version":"4.0.0-1ubuntu8.21","binary_name":"libvirt-daemon-driver-storage-zfs"},{"binary_version":"4.0.0-1ubuntu8.21","binary_name":"libvirt-daemon-system"},{"binary_name":"libvirt-sanlock","binary_version":"4.0.0-1ubuntu8.21"},{"binary_name":"libvirt-wireshark","binary_version":"4.0.0-1ubuntu8.21"},{"binary_name":"libvirt0","binary_version":"4.0.0-1ubuntu8.21"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4147.json"}},{"package":{"name":"libvirt","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libvirt?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.0.0-0ubuntu8.16"}]}],"versions":["5.4.0-0ubuntu5","6.0.0-0ubuntu1","6.0.0-0ubuntu2","6.0.0-0ubuntu3","6.0.0-0ubuntu4","6.0.0-0ubuntu5","6.0.0-0ubuntu6","6.0.0-0ubuntu7","6.0.0-0ubuntu8","6.0.0-0ubuntu8.1","6.0.0-0ubuntu8.2","6.0.0-0ubuntu8.3","6.0.0-0ubuntu8.4","6.0.0-0ubuntu8.5","6.0.0-0ubuntu8.7","6.0.0-0ubuntu8.8","6.0.0-0ubuntu8.9","6.0.0-0ubuntu8.10","6.0.0-0ubuntu8.11","6.0.0-0ubuntu8.12","6.0.0-0ubuntu8.13","6.0.0-0ubuntu8.14","6.0.0-0ubuntu8.15"],"ecosystem_specific":{"binaries":[{"binary_name":"libnss-libvirt","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-clients","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-daemon","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-daemon-driver-lxc","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-daemon-driver-qemu","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-daemon-driver-storage-gluster","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-daemon-driver-storage-rbd","binary_version":"6.0.0-0ubuntu8.16"},{"binary_version":"6.0.0-0ubuntu8.16","binary_name":"libvirt-daemon-driver-storage-zfs"},{"binary_version":"6.0.0-0ubuntu8.16","binary_name":"libvirt-daemon-driver-vbox"},{"binary_version":"6.0.0-0ubuntu8.16","binary_name":"libvirt-daemon-driver-xen"},{"binary_name":"libvirt-daemon-system","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-daemon-system-systemd","binary_version":"6.0.0-0ubuntu8.16"},{"binary_name":"libvirt-daemon-system-sysv","binary_version":"6.0.0-0ubuntu8.16"},{"binary_version":"6.0.0-0ubuntu8.16","binary_name":"libvirt-sanlock"},{"binary_version":"6.0.0-0ubuntu8.16","binary_name":"libvirt-wireshark"},{"binary_name":"libvirt0","binary_version":"6.0.0-0ubuntu8.16"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4147.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H"},{"type":"Ubuntu","score":"low"}]}