Privilege escalation in Minecanton209 Novumos
CVE-2026-40572
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.
Vulnerability class: Privilege Escalation
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.0 (Critical). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.002 (7.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: -0.000
Affected products
- Minecanton209 Novumos — versions < 0.24
Weakness classification (CWE)
References
- github.com/MinecAnton209/NovumOS/security/advisories/GHSA-rg7m-6vh7-f4v2 (Exploit, Vendor Advisory)
- github.com/MinecAnton209/NovumOS/releases/tag/v0.24 (Release Notes)
Frequently asked questions
- What is CVE-2026-40572?
- CVE-2026-40572 is a critical-severity vulnerability in Minecanton209 Novumos, classified under Improper Privilege Management. CVSS score: 9.0/10. Published 2026-04-18.
- How severe is CVE-2026-40572?
- Critical severity. CVSS v3 base score is 9.0 out of 10.