{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-34177", "assignerOrgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "state": "PUBLISHED", "assignerShortName": "canonical", "dateReserved": "2026-03-26T09:24:08.448Z", "datePublished": "2026-04-09T09:15:27.532Z", "dateUpdated": "2026-04-09T12:12:48.251Z"}, "containers": {"cna": {"title": "VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf", "affected": [{"vendor": "Canonical", "product": "lxd", "platforms": ["Linux"], "collectionURL": "https://github.com/canonical", "packageName": "lxd", "repo": "https://github.com/canonical/lxd", "programFiles": ["permissions.go"], "versions": [{"status": "affected", "version": "4.12.0", "lessThan": "5.0.7", "versionType": "semver"}, {"status": "affected", "version": "5.1.0", "lessThan": "5.21.5", "versionType": "semver"}, {"status": "affected", "version": "6.0.0", "lessThan": "6.8.0", "versionType": "semver"}], "defaultStatus": "unaffected"}], "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-184", "description": "CWE-184 Incomplete list of disallowed inputs", "type": "CWE"}]}], "descriptions": [{"lang": "en", "value": "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."}], "references": [{"url": "https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f", "name": "VM lowlevel restriction bypass via raw.apparmor and raw.qemu.conf", "tags": ["vdb-entry", "vendor-advisory"]}, {"url": "https://github.com/canonical/lxd/pull/17909", "name": "lxd: Prevent use of raw.apparmor and raw.qemu.conf when low level options are blocked", "tags": ["patch", "issue-tracking"]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 9.1, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H"}}], "credits": [{"lang": "en", "value": "Miha Purg", "type": "finder"}], "source": {"discovery": "INTERNAL"}, "providerMetadata": {"orgId": "cc1ad9ee-3454-478d-9317-d3e869d708bc", "shortName": "canonical", "dateUpdated": "2026-04-09T09:15:27.532Z"}}, "adp": [{"references": [{"url": "https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f", "tags": ["exploit"]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-04-09T12:12:43.482752Z", "id": "CVE-2026-34177", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-04-09T12:12:48.251Z"}}]}}

{}

{"cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-34177", "lastModified": "2026-04-09T10:16:21.653", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.1, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "HIGH", "scope": "CHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.3, "impactScore": 6.0, "source": "security@ubuntu.com", "type": "Secondary"}]}, "published": "2026-04-09T10:16:21.653", "references": [{"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd/pull/17909"}, {"source": "security@ubuntu.com", "url": "https://github.com/canonical/lxd/security/advisories/GHSA-fm2x-c5qw-4h6f"}], "sourceIdentifier": "security@ubuntu.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-184"}], "source": "security@ubuntu.com", "type": "Secondary"}]}

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