CVE-2026-85526

9.9 criticalEPSS 0.5%

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.

Severity

CVSS 3.1

9.9 critical

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

EPSS: 0.5% chance of exploitation in the next 30 days; higher than 44% of CVEs (scores of 2026-10-31)
CWE: CWE-22
Published: 2026-09-28
Modified: 2026-09-29
Record from: the NVD, synced 2026-10-19

References

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

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