CVE-2026-85526Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD
Updated under an hour ago ()
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It affects Canonical LXD. Add what you run to find out whether that includes you.
EPSS puts the chance of exploitation in the next 30 days at 0.52%, higher than 42% of scored CVEs.
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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 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-22
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- 0.52% (percentile 42)
- Assigned by
- canonical
- NVD analysis
- Deferred
- Record last updated
- Sep 29, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Canonical LXD canonical:lxd (from the name) | from 4.0.0 before 4.0.14; from 5.0.0 before 5.0.10; from 5.21.0 before 5.21.8; from 6.0 before 6.10 | CNA record |
References
- https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rvvendor-advisory, issue-tracking
- https://github.com/canonical/lxd-private/pull/87patch
- https://github.com/canonical/lxd-private/pull/105patch
- https://github.com/canonical/lxd-private/pull/104patch
- https://github.com/canonical/lxd-private/pull/103patch
- https://github.com/canonical/lxd-private/pull/84patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.