{"id":"UBUNTU-CVE-2026-34177","details":"Canonical LXD versions 4.12 through 6.7 contain an incomplete denylist in isVMLowLevelOptionForbidden (lxd/project/limits/permissions.go), which omits raw.apparmor and raw.qemu.conf from the set of keys blocked under the restricted.virtual-machines.lowlevel=block project restriction. A remote attacker with can_edit permission on a VM instance in a restricted project can inject an AppArmor rule and a QEMU chardev configuration that bridges the LXD Unix socket into the guest VM, enabling privilege escalation to LXD cluster administrator and subsequently to host root.","modified":"2026-04-28T16:39:17.324435Z","published":"2026-04-09T10:16:00Z","upstream":["CVE-2026-34177"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34177"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-34177"},{"type":"REPORT","url":"https://github.com/canonical/lxd/pull/17909"},{"type":"REPORT","url":"https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f"}],"affected":[{"package":{"name":"incus","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/incus@6.0.0-1ubuntu0.3+esm3?arch=source&distro=esm-apps/noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.4-1ubuntu1","0.5.1-1","0.5.1-3","0.6-1","6.0.0-1","6.0.0-1ubuntu0.1","6.0.0-1ubuntu0.2","6.0.0-1ubuntu0.2+esm1","6.0.0-1ubuntu0.3","6.0.0-1ubuntu0.3+esm1","6.0.0-1ubuntu0.3+esm2","6.0.0-1ubuntu0.3+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"6.0.0-1ubuntu0.3+esm3","binary_name":"golang-github-lxc-incus-dev"},{"binary_name":"incus","binary_version":"6.0.0-1ubuntu0.3+esm3"},{"binary_name":"incus-agent","binary_version":"6.0.0-1ubuntu0.3+esm3"},{"binary_name":"incus-client","binary_version":"6.0.0-1ubuntu0.3+esm3"},{"binary_name":"incus-migrate","binary_version":"6.0.0-1ubuntu0.3+esm3"},{"binary_name":"incus-tools","binary_version":"6.0.0-1ubuntu0.3+esm3"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34177.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}