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CVE-2026-40317— NovumOS has Privilege Escalation in the Syscall Interface

Quick assessment

Affected

MinecAnton209 NovumOS

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NovumOS是MinecAnton209个人开发者的一个32位保护模式操作系统。 NovumOS 0.24之前版本存在安全漏洞，该漏洞源于Syscall 12未验证用户空间提供的入口地址，可能导致本地权限提升。

CVSS 9.4 · Critical EPSS 0.22% · P13 Updated Apr 21, 2026

Possible ATT&CK Techniques 2 AI

T1055 · Process Injection T1068 · Exploitation for Privilege Escalation

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I. Basic Information for CVE-2026-40317

Vulnerability Information

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Vulnerability Title

NovumOS has Privilege Escalation in the Syscall Interface

Source: CVE Program / CVE List V5

Vulnerability 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.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

特权管理不恰当

Source: CVE Program / CVE List V5

Vulnerability Title

NovumOS 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

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Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
MinecAnton209	NovumOS	< 0.24	-

II. Public POCs for CVE-2026-40317

#	POC Description	Source Link	Shenlong Link

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No public POC found.

III. Intelligence Information for CVE-2026-40317

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Vendor Advisories for CVE-2026-40317 (1)

🔗 Arbitrary Code Execution via Syscall 12 (JumpToUser) · Advisory · MinecAnton209/NovumOS · GitHub Read full article x_refsource_CONFIRM

Other References for CVE-2026-40317 (1)

🔗 Release v0.24: Ironclad (Security & Watchdog) · MinecAnton209/NovumOS · GitHub Read full article x_refsource_MISC

https://www.cve.org/CVERecord?id=CVE-2026-40317

IV. Related Vulnerabilities

Same product: NovumOS

Same vendor: MinecAnton209

Same weakness: CWE-269