CVE-2026-63300
Description
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.
How to fix
- canonical lxd5.0.8, 5.21.6, 6.10 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| canonical lxd | 5.0.0 ≤ v < 5.0.8, 5.1 ≤ v < 5.21.6, 6.0 ≤ v < 6.10 | 5.0.8, 5.21.6, 6.10 |
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