CVE-2026-40317
CRITICAL
INFO
Priority: 0.02
BB Relevance:
54/100
Published: 2026-04-18
Modified: 2026-10-26
First seen: 2026-10-29
Status: active
Attack Surface
Low Complexity
No Auth
No Interaction
Conf. Impact
Integ. Impact
Scope Change
CVSS Vector Breakdown
AV:
Local
AC:
Low
PR:
None
UI:
None
S:
Changed
C:
High
I:
High
A:
High
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 Software (1)
| Vendor | Product | Version |
|---|---|---|
| minecanton209 | novumos | < 0.24 |
References & Advisories (2)
Release Notes
Exploit
Vendor Advisory