Vulnerability Description
An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target project restrictions during cross-project instance copies. When copying an instance to a target project, LXD performs restriction checks before configuration merging is complete, creating a time-of-check to time-of-use (TOCTOU) condition. An attacker can exploit this flaw to copy instances with disallowed high-privilege configurations into restricted projects, bypassing security controls.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Canonical | Lxd | >= 5.0.0, < 5.0.8 |
Related Weaknesses (CWE)
References
- https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4Vendor AdvisoryExploitMitigation
- https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4Vendor AdvisoryExploitMitigation
FAQ
What is CVE-2026-63297?
CVE-2026-63297 is a vulnerability with a CVSS score of 9.9 (CRITICAL). An authorization bypass vulnerability in LXD due to a timing flaw during configuration merging allows an authenticated attacker to bypass target project restrictions during cross-project instance copi...
How severe is CVE-2026-63297?
CVE-2026-63297 has been rated CRITICAL with a CVSS base score of 9.9/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-63297?
Check the references section above for vendor advisories and patch information. Affected products include: Canonical Lxd.