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

Exact source revision recorded 23 Oct 2026 15:48:27 UTC. It does not establish the source's current position. Latest evidence.

cve-program · CVE-2026-85526

Published

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.

Source published
28 Sep 2026 13:21:40 UTC
Source modified
29 Sep 2026 03:55:18 UTC
Observed here
23 Oct 2026 15:48:27 UTC
Source terms
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CVSS 3.1 · 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

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Sources read 12 Nov 06:57 UTC · 266 of 275 readable · 264 fully read · documentation 469/469 current