EUVD-2026-23630CVSS VectorNVD
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
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5DescriptionNVD
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.
AnalysisAI
Unvalidated kernel entry point in NovumOS syscall 12 (JumpToUser) allows any Ring 3 user process to execute arbitrary code at Ring 0 (kernel) privilege level. Affects all versions before 0.24 of this custom x86 operating system written in Zig. …
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RemediationAI
Within 24 hours: inventory all systems running NovumOS and document current versions in use; verify NovumOS version 0.24 or later availability from project maintainers. Within 7 days: evaluate upgrade path to NovumOS 0.24+ in a test environment and develop deployment plan with rollback procedures; coordinate with development teams dependent on NovumOS. …
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