CVE-2026-40572: MINECANTON209 Novumos

Critical severity, CVSS 9.0. EPSS: 0.2% chance of exploitation in the next 30 days.

NovumOS is a custom 32-bit operating system written in Zig and x86 Assembly. In versions prior to 0.24, Syscall 15 (MemoryMapRange) allows Ring 3 user-mode processes to map arbitrary virtual address ranges into their address space without validating against forbidden regions, including critical kernel structures such as the IDT, GDT, TSS, and page tables. A local attacker can exploit this to modify kernel interrupt handlers, resulting in privilege escalation from user mode to kernel context. This issue has been fixed in version 0.24.

Affected products

• MINECANTON209 Novumos: before 0.24 (fixed in 0.24)

Published 2026-04-18. Last modified 2026-06-17.