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CVE-2026-40572

Minecanton209 Novumos privilege escalation

9.0 CRITICALPublic exploitEPSS 0.18%
  1. Published17 Apr 2026

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.

CVSS 3.1 breakdown

Attack vectorLocal
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeChanged
ConfidentialityHigh
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:N

Affected products

Minecanton209 Novumos< 0.24

Remediation

Fixed in
Minecanton209 Novumos≥ 0.24

References

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Frequently asked

Is CVE-2026-40572 being actively exploited?

CVE-2026-40572 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.18%.

How severe is CVE-2026-40572?

CVE-2026-40572 has a CVSS 3.1 base score of 9.0, rated critical. EPSS estimates a 0.18% probability of exploitation.

Which products are affected by CVE-2026-40572?

Affected products include Minecanton209 Novumos.

How do I fix CVE-2026-40572?

Upgrade affected software to a fixed version, for example Minecanton209 Novumos 0.24 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.