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

> A local attacker can escalate privileges to kernel context by mapping arbitrary memory ranges via Syscall 15 in NovumOS.

- **Severity:** Critical 9.0 (`CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Local or same network only
- **Victim action needed:** Not needed
- **Fix available:** No
- **Published:** 18 Apr 2026
- **Updated:** 20 Apr 2026
- **Also known as:** GHSA-rg7m-6vh7-f4v2

## What is CVE-2026-40572?

CVE-2026-40572 is a critical vulnerability in MinecAnton209 NovumOS, published on 18 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.

### 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.

Weakness: CWE-269 (Improper Privilege Management)

## Which versions are affected by CVE-2026-40572?

It affects 1 product.


Products: Minecanton209 Novumos.

## How do I fix CVE-2026-40572?

No fix has been published for CVE-2026-40572 yet. Limit exposure of the affected software until one is available.

## Is CVE-2026-40572 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40572 exists.

## Other vulnerabilities in MinecAnton209 NovumOS

- [CVE-2026-40317](https://insights.sbomify.com/CVE-2026-40317/): NovumOS has Privilege Escalation in the Syscall Interface (critical 9.4)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-40572 and fix it if it is affected.

What it is: CVE-2026-40572 is a critical vulnerability in MinecAnton209 NovumOS, published on 18 Apr 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Exploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-40572 exists.

Affected product: MinecAnton209 NovumOS. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-40572/ (Markdown: https://insights.sbomify.com/CVE-2026-40572/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-40572
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-40572
- OSV: https://osv.dev/vulnerability/CVE-2026-40572

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-40572/
Summaries are generated and may contain mistakes; the official description above is the record.