Privilege escalation in Minecanton209 Novumos
CVE-2026-40317
NovumOS is a custom 32-bit operating system written in Zig and x86 Assembly. In versions prior to 0.24, Syscall 12 (JumpToUser) accepts an arbitrary entry point address from user-space registers without validation, allowing any Ring 3 user…
Vulnerability class: Privilege Escalation
EPSS: 0.000 (4.2th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.4 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Minecanton209 Novumos — versions < 0.24
Weakness classification (CWE)
References
- https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fm (x_refsource_CONFIRM)
- https://github.com/MinecAnton209/NovumOS/releases/tag/v0.24 (x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-40317?
- CVE-2026-40317 is a critical-severity vulnerability in Minecanton209 Novumos, classified under Improper Privilege Management. CVSS score: 9.4/10. Published 2026-04-18.
- How severe is CVE-2026-40317?
- Critical severity. CVSS v3 base score is 9.4 out of 10.