9.9

CVE-2026-85526

Path traversal via Btrfs optimized-backup subvolumes[].path enables root file/dir manipulation in LXD

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.
Daten sind bereitgestellt durch das CVE Programm von einer CVE Numbering Authority (CNA) (Unstrukturiert).
HerstellerCanonical
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Produkt LXD
Default Statusunaffected
Version 4.0.0
Version < 4.0.14
Status affected
Version 5.0.0
Version < 5.0.10
Status affected
Version 5.21.0
Version < 5.21.8
Status affected
Version 6.0
Version < 6.10
Status affected
VulnDex Vulnerability Enrichment
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.52% 0.416
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
Canonical 9.9 3.1 6
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
CWE-22 Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv
https://github.com/canonical/lxd-private/pull/87
https://github.com/canonical/lxd-private/pull/105
https://github.com/canonical/lxd-private/pull/104
https://github.com/canonical/lxd-private/pull/103
https://github.com/canonical/lxd-private/pull/84