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.
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History
Mon, 20 Apr 2026 16:15:00 +0000
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Mon, 20 Apr 2026 15:15:00 +0000
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Sat, 18 Apr 2026 01:00:00 +0000
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| 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 |
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-04-18T00:12:10.368Z
Updated: 2026-04-20T15:26:25.222Z
Reserved: 2026-04-10T21:41:54.505Z
Link: CVE-2026-40317
Updated: 2026-04-20T15:26:12.103Z
Status : Awaiting Analysis
Published: 2026-04-18T01:16:19.380
Modified: 2026-04-20T19:03:07.607
Link: CVE-2026-40317
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