CVE-2026-40317 NovumOS has Privilege Escalation in the Syscall Interface
A local attacker can escalate privileges to Ring 0 by exploiting unvalidated syscall entry points in NovumOS, allowing arbitrary kernel code execution.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40317?
CVE-2026-40317 is a critical vulnerability in MinecAnton209 NovumOS, published on 18 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
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.
Which versions are affected by CVE-2026-40317?
It affects 1 product.
Products include Minecanton209 Novumos.
How do I fix CVE-2026-40317?
No fix has been published for CVE-2026-40317 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-40317 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40317 exists.
Other vulnerabilities in MinecAnton209 NovumOS
Sources
Also known as GHSA-xjx3-gjh9-45fm.