CVE-2026-12411

Broken Access Control in Canonical LXD DevLXD API

State: Published
Severity: 8.4 High
Published: Jun 26, 2026
Updated: Jun 26, 2026
Reserved: Jun 16, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	8.4 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:N	canonical

Weaknesses

CWE-639 Authorization bypass through User-Controlled key
CWE-862 Missing Authorization

Affected Products

Product	Versions
lxdCanonical	6.6 to before 6.9Affected

References

Cross-guest volume hijack via DevLXD device patchvdb-entryvendor-advisory
Security fixes from the 6.9 releasepatch

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