CVE-2026-85526 — Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD
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…
Published: 2026-09-28 · CVSS: 9.9 · CVSS 3.1
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7