CVE-2026-40317
CriticalSummary
NovumOS to niestandardowy 32-bitowy system operacyjny, który w wersjach przed 0.24 ma lukę w Syscall 12 (JumpToUser), pozwalającą na akceptację dowolnego adresu punktu wejścia z rejestrów przestrzeni użytkownika bez walidacji. Umożliwia to procesom w trybie użytkownika (Ring 3) skok do adresów jądra i wykonywanie dowolnego kodu w kontekście Ring 0, co prowadzi do eskalacji uprawnień lokalnych.
Risk Assessment
Luka ta stwarza poważne ryzyko dla bezpieczeństwa systemu, umożliwiając atakującym uzyskanie pełnych uprawnień w systemie operacyjnym. Może to prowadzić do nieautoryzowanego dostępu do wrażliwych danych i zasobów systemowych.
Recommendation
Zaleca się jak najszybsze zaktualizowanie systemu do wersji 0.24. Jeśli aktualizacja nie jest możliwa, należy ograniczyć dostęp do syscall, uruchamiając system w trybie pojedynczego użytkownika bez Ring 3 oraz dezaktywować procesy w trybie użytkownika, uruchamiając tylko powłokę jądra.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS