CVE-2026-63300
An improper validation vulnerability in the instancePostMigration function in lxd/instance_post.go of LXD allows an authenticated attacker with can_create_instances permissions on a restricted project to bypass project-level security restrictions. When migrating an instance between projects, LXD fails to validate the instance's configuration against the target project's enforced restrictions (such as restricted.containers.lowlevel, restricted.devices.*, and restricted.networks.access). An attacker can exploit this by creating a disallowed or high-privilege instance in an unrestricted project and subsequently moving it into the restricted project.
- Score
- CVSS 3.1 9.9 Critical
- Status
- Analyzed - security@ubuntu.com
- Published
- 2026-08-12
- Last modified
- 2026-10-24
- Weaknesses
- CWE-862
Affected products
References
- https://github.com/canonical/lxd/security/advisories/GHSA-5g5r-wh97-qcq2
- https://github.com/canonical/lxd/pull/18651
- https://github.com/canonical/lxd/pull/18605
