Canonical LXD up to 5.0.7/5.21.5/6.9 Instance Migration lxd/instance_post.go instancePostMigration privileges management

Summaryinfo

A vulnerability categorized as very critical has been discovered in Canonical LXD up to 5.0.7/5.21.5/6.9. This affects the function instancePostMigration of the file lxd/instance_post.go of the component Instance Migration. The manipulation results in privileges management. This vulnerability is identified as CVE-2026-63300. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Canonical LXD up to 5.0.7/5.21.5/6.9. It has been classified as very critical. Affected is the function instancePostMigration of the file lxd/instance_post.go of the component Instance Migration. The manipulation with an unknown input leads to a privileges management vulnerability. CWE is classifying the issue as CWE-269. The product does not properly assign, modify, track, or check privileges for an actor, creating an unintended sphere of control for that actor. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-63300 since 07/16/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 08/12/2026). This vulnerability is assigned to T1068 by the MITRE ATT&CK project.

Upgrading to version 5.0.8, 5.21.6 or 6.10 eliminates this vulnerability.

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Productinfo

Vendor

• Canonical

Name

• LXD

Version

• 5.0.0
• 5.0.1
• 5.0.2
• 5.0.3
• 5.0.4
• 5.0.5
• 5.0.6
• 5.0.7
• 5.21.0
• 5.21.1
• 5.21.2
• 5.21.3
• 5.21.4
• 5.21.5
• 6.0
• 6.1
• 6.2
• 6.3
• 6.4
• 6.5
• 6.6
• 6.7
• 6.8
• 6.9

License

• open-source

Website

• Product: https://github.com/canonical/lxd/

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