CVE-2026-85526
criticalPath traversal in the Btrfs storage driver (unpackVolume) in Canonical LXD on Linux allows an authenticated user with instance creation privileges to delete or…
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.
CVSS
9.9
9.9 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H Severity source: NVD CVSS v3.1 (security@ubuntu.com)
Timeline (UTC)
Published: 2026-09-28 14:17
Modified: 2026-09-29 04:18
NVD status: Deferred
Last synced 2 days ago
Verified against the source API 2026-10-27 06:56 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/canonical/lxd-private/pull/103 security@ubuntu.com
- https://github.com/canonical/lxd-private/pull/104 security@ubuntu.com
- https://github.com/canonical/lxd-private/pull/105 security@ubuntu.com
- https://github.com/canonical/lxd-private/pull/84 security@ubuntu.com
- https://github.com/canonical/lxd-private/pull/87 security@ubuntu.com
- https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv security@ubuntu.com
Data sources
NVD CVE API 2.0 — fetched 2026-10-27 06:56 UTC · record ↗