Broken Access Control in Canonical LXD Affects Cross-Guest Volume Management
CVE-2026-12411

8.4HIGH

Key Information:

Vendor

Canonical

Status
Lxd
Vendor
CVE Published:
26 June 2026

What is CVE-2026-12411?

A broken access control vulnerability in the devLXDInstancePatchHandler component of Canonical LXD enables an untrusted guest to exploit security settings. When security.devlxd.management.volumes is enabled, an attacker can mount, read, and overwrite another guest's custom storage volume through a malicious device PATCH request sent over /dev/lxd. This flaw poses a significant risk to guest isolation and storage management within LXD containers.

Affected Version(s)

lxd Linux 6.6 < 6.9

References

https://github.com/canonical/lxd/security/advisories/GHSA...
vdb-entryvendor-advisory
https://github.com/canonical/lxd/pull/18585
patch

CVSS V3.1

Score:
8.4
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Privileges Required:
Low
User Interaction:
None
Scope:
Changed

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.