{"id":"UBUNTU-CVE-2026-77159","details":"A symlink-following flaw was found in libvirt's qemuTPMEmulatorPrepareHost() function. The function uses a path-based chown() on the swtpm logfile without checking for symbolic links. A local attacker with access to the swtpm account can replace the logfile with a symlink, causing libvirtd (running as root) to transfer ownership of an arbitrary file to the swtpm user.","modified":"2026-09-16T11:41:46Z","published":"2026-09-11T11:16:00Z","upstream":["CVE-2026-77159"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-77159"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-77159"},{"type":"REPORT","url":"https://access.redhat.com/security/cve/CVE-2026-77159"}],"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/2026/UBUNTU-CVE-2026-77159.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"}]}],"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","1.3.1-1ubuntu10.31+esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.1-1ubuntu10.31+esm1","binary_name":"libvirt-bin"},{"binary_name":"libvirt0","binary_version":"1.3.1-1ubuntu10.31+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-77159.json"}},{"package":{"name":"libvirt","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/libvirt?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","4.0.0-1ubuntu8.21","4.0.0-1ubuntu8.21+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"libnss-libvirt","binary_version":"4.0.0-1ubuntu8.21+esm1"},{"binary_name":"libvirt-bin","binary_version":"4.0.0-1ubuntu8.21+esm1"},{"binary_name":"libvirt-clients","binary_version":"4.0.0-1ubuntu8.21+esm1"},{"binary_name":"libvirt-daemon","binary_version":"4.0.0-1ubuntu8.21+esm1"},{"binary_name":"libvirt-daemon-driver-storage-gluster","binary_version":"4.0.0-1ubuntu8.21+esm1"},{"binary_version":"4.0.0-1ubuntu8.21+esm1","binary_name":"libvirt-daemon-driver-storage-rbd"},{"binary_name":"libvirt-daemon-driver-storage-sheepdog","binary_version":"4.0.0-1ubuntu8.21+esm1"},{"binary_name":"libvirt-daemon-driver-storage-zfs","binary_version":"4.0.0-1ubuntu8.21+esm1"},{"binary_version":"4.0.0-1ubuntu8.21+esm1","binary_name":"libvirt-daemon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