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9.3
NovumOS versions prior to 0.24 allow malicious code execution
CVE-2026-40317
Summary
Old versions of NovumOS allow a malicious program to take control of the system by executing arbitrary code at a high level of access, potentially causing system instability or data corruption. This issue has been fixed in version 0.24, which should be updated to prevent exploitation. If an update isn't possible, running the system in a restricted mode can help prevent the issue.
Original title
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 wi...
Original 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.
nvd CVSS3.1
9.3
Vulnerability type
CWE-20
Improper Input Validation
CWE-269
Improper Privilege Management
Published: 18 Apr 2026 · Updated: 18 Apr 2026 · First seen: 18 Apr 2026