CVE-2026-85526
CRITICALCVSS 9.9Description
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.
Timeline
Published:September 28th, 2026 2:17 PM
Last modified:September 29th, 2026 4:18 AM
CVSS Scoring
CVSS v3: 9.9 (CRITICAL)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weaknesses (CWE)
References & Reports
Advisories, patches, and third-party reports
- https://github.com/canonical/lxd-private/pull/103
- https://github.com/canonical/lxd-private/pull/104
- https://github.com/canonical/lxd-private/pull/105
- https://github.com/canonical/lxd-private/pull/84
- https://github.com/canonical/lxd-private/pull/87
- https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv
Source: NIST NVD · Data may lag official sources by up to one minute