Status: UPDATED
| Advisory ID: CVE-2026-85185
Key Details
| CVE | CVE-2026-85185 |
| CVSS Score / Version | 9.6 (Critical) / CVSS v3.1 |
| Updated | 2026-09-28 |
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H |
| CVSS Prose | attack vector is network; attack complexity is low; privileges required is low; user interaction is none; scope is changed; confidentiality impact is none; integrity impact is high; availability impact is high. |
| Affected products | canonical lxd |
| Classified as | CWE-22 (Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')) |
Affected Products, Subsystems & Sectors
| Subsystems | General OT |
| Sectors | Multiple |
What to Know
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. (NVD)
What to Do
Monitor canonical's web page for any future patch releases.
References