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.
History

Mon, 20 Apr 2026 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'total'}, 'version': '2.0.3'}


Mon, 20 Apr 2026 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Minecanton209
Minecanton209 novumos
Vendors & Products Minecanton209
Minecanton209 novumos

Sat, 18 Apr 2026 01:00:00 +0000

Type Values Removed Values Added
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.
Title NovumOS has Privilege Escalation in the Syscall Interface
Weaknesses CWE-20
CWE-269
References
Metrics cvssV3_1

{'score': 9.4, 'vector': 'CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-04-20T15:26:25.222Z

Reserved: 2026-04-10T21:41:54.505Z

Link: CVE-2026-40317

cve-icon Vulnrichment

Updated: 2026-04-20T15:26:12.103Z

cve-icon NVD

Status : Awaiting Analysis

Published: 2026-04-18T01:16:19.380

Modified: 2026-04-20T19:03:07.607

Link: CVE-2026-40317

cve-icon Redhat

No data.