Vulnerability · Published Apr 18, 2026 · Assigned by GitHub_M

CVE-2026-40572NovumOS has Arbitrary Memory Mapping via Syscall 15 (MemoryMapRange)

Critical 9.0

In plain English

A critical-severity privilege mismanagement in NovumOS from MinecAnton209. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 12% of all known vulnerabilities).

Severity (CVSS 3.1)9.0Critical

Exploit odds (30 days)0.2%top 88.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

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 (as reported)

Vendor	Product	Versions
MinecAnton209	NovumOS	< 0.24

Weakness: CWE-269 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

References

https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-rg7m-6vh7-f4v2 x_refsource_CONFIRM
https://github.com/MinecAnton209/NovumOS/releases/tag/v0.24 x_refsource_MISC