{"schemaVersion":3,"id":"CVE-2026-85185","aliases":["UBUNTU-CVE-2026-85185","DEBIAN-CVE-2026-85185"],"status":"published","duplicateOf":null,"title":null,"description":"Path traversal in the btrfs storage driver in Canonical LXD versions 4.0.2 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client with permission to create instances in a project to delete arbitrary files on the host as root. On hosts whose root filesystem is btrfs, the client can also place attacker-controlled content at arbitrary host paths, leading to full host compromise. The client does this with a crafted subvolume path containing ../ sequences, sent in either of two ways: in the optimized_header.yaml of an optimized btrfs backup, or in the btrfs migration header sent by a malicious migration source.","dates":{"published":"2026-09-28T13:21:51.596Z","modified":"2026-09-28T16:32:28.529Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":9.6,"severity":"critical","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":9.6,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":9.6,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","exploitability":7.9,"impact":9.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Debian","score":9.6,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","exploitability":7.9,"impact":9.7,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":9.6,"severity":"critical","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00361,"percentile":0.28407,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-09-29T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00361,"percentile":0.28407}],"last30":[{"date":"2026-09-29T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00361,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00361,"percentile":0.28407}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-22","name":"Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')","description":"The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"High","url":"https://cwe.mitre.org/data/definitions/22.html"}],"affected":[{"vendor":"canonical","product":"lxd","name":"lxd","label":"lxd","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.0.2, < 4.0.14","noFixRecorded":false,"fixedIn":null},{"text":"≥ 5.0.0, < 5.0.10","noFixRecorded":false,"fixedIn":null},{"text":"≥ 5.21.0, < 5.21.8","noFixRecorded":false,"fixedIn":null},{"text":"≥ 6.0, < 6.10","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.2, < 4.0.14 | ≥ 5.0.0, < 5.0.10 | ≥ 5.21.0, < 5.21.8 | ≥ 6.0, < 6.10","eol":null,"hubHref":"/vendor/canonical/lxd"},{"vendor":"debian","product":"incus","name":"incus","label":"incus","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/incus","purlType":"deb","versions":[{"text":"< 6.0.4-2+deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 7.0.1-5","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 6.0.4-2+deb13u1 | < 7.0.1-5","eol":null,"hubHref":null},{"vendor":"debian","product":"lxd","name":"lxd","label":"lxd","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/lxd","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"incus","name":"incus","label":"incus","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/incus","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"lxd","name":"lxd","label":"lxd","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/lxd","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null}],"affectedCount":5,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p","label":"github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p","hostname":"github.com","tags":["Vendor Advisory","REPORT"]},{"url":"https://ubuntu.com/security/CVE-2026-85185","label":"ubuntu.com/security/CVE-2026-85185","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-85185","label":"www.cve.org/CVERecord?id=CVE-2026-85185","hostname":"www.cve.org","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-85185","label":"security-tracker.debian.org/tracker/CVE-2026-85185","hostname":"security-tracker.debian.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["OPENSUSE-SU-2026:11983-1"],"duplicates":[],"related":["OPENSUSE-SU-2026:11983-1"]},"timeline":[{"kind":"published","date":"2026-09-28T13:21:51.596Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-09-28T16:32:28.529Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":70,"level":"high","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T04:45:46.223Z","stale":false,"partial":false}}