Status: UPDATED
| Advisory ID: CVE-2026-85526
Key Details
| CVE | CVE-2026-85526 |
| CVSS Score / Version | 9.9 (Critical) / CVSS v3.1 |
| Updated | 2026-09-29 |
| CVSS Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/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 high; 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 (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or replace arbitrary files and directories on the host filesystem as root via a crafted subvolumes[].path entry in backup/optimized_header.yaml during a btrfs optimized backup import.
What to Do
Monitor canonical's web page for any future patch releases.
References