{"id":"CVE-2026-85185","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-85185","generatedAt":"2026-10-28T01:19:33.931Z","title":"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…","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.","published":"2026-09-28T14:17:20.000Z","lastModified":"2026-09-28T17:17:51.000Z","status":"Deferred","sourceIdentifier":"security@ubuntu.com","cvss":{"version":"3.1","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"},"cwe":["CWE-22"],"affected":[],"epss":{"score":0.00369,"percentile":0.30501,"date":"2026-10-26","history":[{"date":"2026-09-29","score":0.00361,"percentile":0.27358}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.37%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-28T14:17:20.000Z","detail":{"score":"9.6","severity":"CRITICAL","publishedAt":"2026-09-28T14:17:20.130Z"},"summary":"New CVE, critical severity (CVSS 9.6)."}],"references":[{"url":"https://github.com/canonical/lxd/security/advisories/GHSA-27q7-qwhm-c34p","source":"security@ubuntu.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-85185","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}