CVE-2026-85526

published 2026-09-28

CVE-2026-85526: Path traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or…

Priority P2 63 critical 9.9 CVSS 3.1

AV N AC L PR L UI N S C C H I H A H

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.

Affected

4 ranges

Vendor	Product	Version range	Fixed in
canonical	lxd	>= 4.0.0 < 4.0.14	4.0.14
canonical	lxd	>= 5.0.0 < 5.0.10	5.0.10
canonical	lxd	>= 5.21.0 < 5.21.8	5.21.8
canonical	lxd	>= 6.0 < 6.10	6.10

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CWE-22