Vulnerability · Published Aug 21, 2026 · Assigned by GitHub_M
CVE-2026-62941Incus: Cross-project instance copy bypasses target project restrictions via TOCTOU in config merge
Critical 9.9
In plain English
A critical-severity incorrect authorization in incus from lxc. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Incus is a system container and virtual machine manager. Prior to version 7.3.0, when copying an instance across projects, the project restriction check (`AllowInstanceCreation`) runs BEFORE the source instance's configuration is merged into the request. Dangerous configuration keys (including `security.privileged`, `raw.lxc`, `raw.apparmor`) from the source instance are merged AFTER the check passes, bypassing all project restrictions on the target project. Version 7.3.0 patches the issue.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | incus | 6.0.4-2+deb13u9 | DEBIAN-CVE-2026-62941 |
| Debian:14 | incus | 7.0.1-2 | DEBIAN-CVE-2026-62941 |
| Ubuntu:26.10 | incus | no fix listed | UBUNTU-CVE-2026-62941 |
Affected products (as reported)
Weakness: CWE-863 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
References
- https://github.com/lxc/incus/security/advisories/GHSA-mq9x-prm8-3vpw x_refsource_CONFIRM