CVE-2026-12411: Canonical Lxd

Critical severity, CVSS 9.6. EPSS: 0.3% chance of exploitation in the next 30 days.

Broken Access Control in the devLXDInstancePatchHandler component of Canonical LXD allows an untrusted guest to mount, read, and overwrite another guest's custom storage volume via a crafted device PATCH request over /dev/lxd when security.devlxd.management.volumes is enabled.

Affected products

• Canonical Lxd: from 6.6, before 6.9 (fixed in 6.9)

Published 2026-06-26. Last modified 2026-07-02.