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TI-2026-29094 Aliases CVE-2026-40317

NovumOS has Privilege Escalation in the Syscall Interface

Priority HIGH 76CWE-20Published · Updated

Key facts

Attack vector
Local
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Privilege escalation
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-269.

Summary

NovumOS is a custom 32-bit operating system written in Zig and x86 Assembly. In versions prior to 0.24, Syscall 12 (JumpToUser) accepts an arbitrary entry point address from user-space registers without validation, allowing any Ring 3 user-mode process to jump to kernel addresses and execute arbitrary code in Ring 0 context, resulting in local privilege escalation. This issue has been fixed in version 0.24. If developers are unable to immediately update, they should restrict syscall access by running the system in single-user mode without Ring 3, and disable user-mode processes by only running kernel shell with no user processes. This issue has been fixed in version 0.24.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00225 13th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed NovumOS (MinecAnton209): 0.24

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
MinecAnton209NovumOSbefore 0.240.24Patch availableCNA
  • NovumOS VendorMinecAnton209 Affected before 0.24 Fixed in 0.24 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:o:minecanton209:novumos:*:*:*:*:*:*:*:*before 0.24VulnerableMinecAnton209
  • cpe:2.3:o:minecanton209:novumos:*:*:*:*:*:*:*:* Versions before 0.24 Vulnerable ·MinecAnton209

Remediation

  • Fix · CNA NovumOS (MinecAnton209) Fixed in 0.24

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-40317

References

Exploit 1

Other 1

  • TI-2026-29313 NovumOS has Arbitrary Memory Mapping via Syscall 15 (MemoryMapRange) CVSS 3.1CRITICAL 9.0

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences