CVE-2026-63297
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.
- Score
- CVSS 3.1 9.9 Critical
- Status
- Analyzed - security@ubuntu.com
- Published
- 2026-08-12
- Last modified
- 2026-10-24
- Weaknesses
- CWE-367, CWE-863
Affected products
References
- https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4
