PT-2026-99890

CVE-2026-85526

Published

2026-09-28

Updated

2026-10-04

Description by

CVSS 3.1

9.9

Critical

MetricsAV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions Canonical LXD (affected versions not specified)

Description A path traversal issue exists in the Btrfs storage driver within the unpackVolume() function. An authenticated user with instance creation privileges can delete or replace arbitrary files and directories on the host filesystem with root privileges. This is achieved by providing a crafted subvolumes[].path entry in the backup/optimized header.yaml file during a Btrfs optimized backup import.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploitability

Exploit

Impacts

Researchers

Eclipssec

Vendors

Affected products

Weakness enumeration

CWE-22: Improper Limitation of a Pathname to a Restricted Directory (\'Path Traversal\')

Related identifiers

CVE-2026-85526