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CVE PROGRAM SOURCE RECORD9.9 Critical

CVE-2026-85526

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

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Status
Published
Published
Updated
Assigning organization
canonical

Description

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.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Canonical LXD

Default version status: unaffected

  • 4.0.0 to < 4.0.14affected
  • 5.0.0 to < 5.0.10affected
  • 5.21.0 to < 5.21.8affected
  • 6.0 to < 6.10affected

References