CVE-2026-12411 Broken Access Control in Canonical LXD DevLXD API
An untrusted guest can mount, read, and overwrite another guest's storage volume via a crafted API request when specific management settings are enabled.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-12411?
CVE-2026-12411 is a high-severity missing authorization vulnerability in Canonical lxd, published on 26 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Which versions are affected by CVE-2026-12411?
It affects 1 product.
Products include Canonical Lxd.
How do I fix CVE-2026-12411?
No fix has been published for CVE-2026-12411 yet. Limit exposure of the affected software until one is available.
Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.
Is CVE-2026-12411 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-12411 exists.
Other vulnerabilities in Canonical lxd
- CVE-2026-66897 Instance template path traversal allows arbitrary host file write as root
- CVE-2026-62420 Cross-project cluster migration bypasses project restrictions via cluster notification flag
- CVE-2026-63293 Arbitrary File Read/Write: metadata.yaml symlink in image allows host filesystem access as root
- CVE-2026-63294 Root RCE via image backup.yaml symlink
- CVE-2026-63296 Project restriction bypass via instance migration config override
Sources
Also known as GHSA-hhf9-qw4v-72xp.