Critical NovumOS Flaw: Kernel Takeover via Memory Mapping
The National Vulnerability Database has disclosed CVE-2026-40572, a critical vulnerability in NovumOS versions prior to 0.24. This custom 32-bit operating system, built with Zig and x86 Assembly, features a syscall 15 (MemoryMapRange) that fails to validate user-requested memory regions. This allows Ring 3 user-mode processes to map arbitrary virtual address ranges, including forbidden kernel structures like the IDT, GDT, TSS, and page tables.
A local attacker can exploit this design flaw to modify critical kernel interrupt handlers. By manipulating these structures, an attacker can achieve privilege escalation from user mode directly into kernel context, effectively taking full control of the system. The National Vulnerability Database assigns this a CVSS score of 9.0 (CRITICAL).
This is a fundamental design flaw, not a subtle bug. The ability for unprivileged processes to map and modify kernel memory is a nightmare scenario for any OS. NovumOS has addressed this issue in version 0.24, implementing proper validation to prevent unauthorized mapping of kernel regions.
What This Means For You
- If your organization or projects utilize NovumOS, immediately verify that all deployments are running version 0.24 or later. This is a local privilege escalation, meaning an attacker already on the system can jump to kernel privileges. Patching is non-negotiable. Review your system build processes to ensure you're not deploying vulnerable versions, especially in embedded or specialized environments where NovumOS might be used.
Related ATT&CK Techniques
🛡️ Detection Rules
2 rules · 6 SIEM formats2 detection rules auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
NovumOS Syscall 15 MemoryMapRange Abuse - CVE-2026-40572
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-40572 | Privilege Escalation | NovumOS versions prior to 0.24 |
| CVE-2026-40572 | Privilege Escalation | NovumOS Syscall 15 (MemoryMapRange) |
| CVE-2026-40572 | Privilege Escalation | Arbitrary virtual address range mapping without validation |
| CVE-2026-40572 | Privilege Escalation | Modification of kernel interrupt handlers (IDT, GDT, TSS, page tables) |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | April 18, 2026 at 04:16 UTC |
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