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Vulnerability record · CVE-2026-40317 · published 18 April 2026

CVE-2026-40317: Minecanton209 novumos improper input validation vulnerability

MMinecanton209 · Novumos

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.

9.3 CVSS 3.1 Critical EPSS 0.20% · top 91.4% CWE-20 · Improper input validationCWE-269 · Improper privilege management
9.3CVSS 3.1 base score
0.20%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/MinecAnton209/NovumOS/releases/tag/v0.24 Release Notes
https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fm ExploitVendor Advisory
https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fm ExploitVendor Advisory

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Source: NIST National Vulnerability Database (record CVE-2026-40317), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.