CriticalCritical vulnerability
CVE-2026-85526 (CVSS 9.9)
NVD · officialPublished Sep 28, 2026Risk 50/100
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.
Technical details
CVSS
9.9
AV:NetworkAC:LowPR:LowUI:NoneC:HighI:HighA:High
Evidence and sources
This record is attributed to NVD. Exploitation status and remediation guidance are kept separate from the vulnerability's technical severity.
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