CVE-2026-63297

CRITICAL9.9

Published 2026-08-12 · Source security@ubuntu.com

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 vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H

CWE-367CWE-863

References

https://github.com/canonical/lxd/security/advisories/GHSA-v989-qw7w-xvg4

View on NVD

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