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.
CVE-2026-85526
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-85526
LXD
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://github.com/canonical/lxd",
"vendor": "Canonical",
"product": "LXD",
"versions": [
{
"status": "affected",
"version": "4.0.0",
"lessThan": "4.0.14",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.0.0",
"lessThan": "5.0.10",
"versionType": "semver"
},
{
"status": "affected",
"version": "5.21.0",
"lessThan": "5.21.8",
"versionType": "semver"
},
{
"status": "affected",
"version": "6.0",
"lessThan": "6.10",
"versionType": "semver"
}
],
"platforms": [
"Linux"
],
"packageName": "LXD",
"defaultStatus": "unaffected"
}
]- Related CVEs
- CVE-2026-85526
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #3408 · Revision 1
- Added to Heist Feed
- Publisher date