CVE-2026-85526
9.9 CRITICALpublic exploit availablePublished 2026-09-28 · Updated 2026-09-29
AI risk analysis
- Summary
- This flaw allows an authenticated user to traverse paths and delete or replace arbitrary files and directories on the host filesystem, posing a significant risk due to the elevated privileges involved.
- Exploitability
- Exploitation requires an authenticated user with instance creation privileges, making it moderately hard to exploit.
- Blast radius
- If exploited, this flaw could lead to complete host compromise, as the attacker can perform operations as root.
- Detection
- No reliable host or network indicator is derivable from the published description.
- Prioritized remediation
- Disable btrfs optimized backup import functionality or restrict access to the affected feature.
rceauth-bypassfilesystemprivilege-escalation
Analysis generated locally by qwen2.5:7b-instruct (no data left the box). AI-assisted — verify against primary sources before acting.
NVD 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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Weaknesses
CWE-22
Public exploit & PoC references
- https://github.com/canonical/lxd-private/pull/103
- https://github.com/canonical/lxd-private/pull/104
- https://github.com/canonical/lxd-private/pull/105
- https://github.com/canonical/lxd-private/pull/84
- https://github.com/canonical/lxd-private/pull/87
- https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv
All references
- https://github.com/canonical/lxd-private/pull/103
- https://github.com/canonical/lxd-private/pull/104
- https://github.com/canonical/lxd-private/pull/105
- https://github.com/canonical/lxd-private/pull/84
- https://github.com/canonical/lxd-private/pull/87
- https://github.com/canonical/lxd/security/advisories/GHSA-h85r-gjgx-g2rv
Source data: NVD (nvd.nist.gov), public domain. Exploit-DB.ai adds local AI analysis for defensive use only.
Related CVEs
- HIGHCVE-2026-78424PoC
- CRITICALCVE-2026-84474
- HIGHCVE-2026-100520PoC
- HIGHCVE-2026-15979
- LOWCVE-2026-63416PoC
- CRITICALCVE-2026-80155
- CRITICALCVE-2026-80156
- CRITICALCVE-2026-88624PoC
Related by shared AI tags and CWE weakness class. Browse the full archive.