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Vulnerability details

CVE-2026-85185

Canonical LXD

Path traversal in LXD btrfs storage driver allows arbitrary file deletion and write on host as root

CVSS 3.1
9.6Critical

Official description

Path traversal in the btrfs storage driver in Canonical LXD versions 4.0.2 and later (fixed in 4.0.14, 5.0.10, 5.21.8 and 6.10) on Linux allows an authenticated client with permission to create instances in a project to delete arbitrary files on the host as root. On hosts whose root filesystem is btrfs, the client can also place attacker-controlled content at arbitrary host paths, leading to full host compromise. The client does this with a crafted subvolume path containing ../ sequences, sent in either of two ways: in the optimized_header.yaml of an optimized btrfs backup, or in the btrfs migration header sent by a malicious migration source.

CVSS scores

ScoreVersionSourceVector
9.6Critical 3.1 CVEProject cvelistV5 (CNA) (canonical) CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:H/A:H

Affected products

VendorProductVersionsSource
Canonical LXD 4.0.2 ≤ v < 4.0.14 CVEProject cvelistV5 (CNA)
Canonical LXD 5.0.0 ≤ v < 5.0.10 CVEProject cvelistV5 (CNA)
Canonical LXD 5.21.0 ≤ v < 5.21.8 CVEProject cvelistV5 (CNA)
Canonical LXD 6.0 ≤ v < 6.10 CVEProject cvelistV5 (CNA)

References and advisories

1
Kolun on Telegram @kolunsec Exploited CVEs, key news and a daily digest Alerts for this product's next CVEsFollow the product to get new vulnerabilities on Telegram.

Details

Published
2026-09-28
Last updated
2026-09-28
State
Published
Assigner (CNA)
canonical

Exploit prediction (EPSS)

0.36%
Probability of exploitation in 30 days
30.9%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Partial

Weaknesses (CWE)

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