Is CVE-2026-85526 being exploited?

No public exploit is currently tracked.

How severe is CVE-2026-85526?

CVE-2026-85526 has a CVSS v3 severity of CRITICAL (9.9).

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CVE-2026-85526

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.