Vulnerability · Published Apr 18, 2026 · Assigned by GitHub_M
CVE-2026-40317NovumOS has Privilege Escalation in the Syscall Interface
Critical 9.4
In plain English
A critical-severity privilege mismanagement in NovumOS from MinecAnton209. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities).
Official description
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-mode process to jump to kernel addresses and execute arbitrary code in Ring 0 context, resulting in local privilege escalation. This issue has been fixed in version 0.24. If developers are unable to immediately update, they should restrict syscall access by running the system in single-user mode without Ring 3, and disable user-mode processes by only running kernel shell with no user processes. This issue has been fixed in version 0.24.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| MinecAnton209 | NovumOS | < 0.24 |
Weakness: CWE-269, CWE-20 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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