CVE-2026-40317: CWE-269: Improper Privilege Management in MinecAnton209 NovumOS
CVE-2026-40317 is a critical local privilege escalation vulnerability in NovumOS versions prior to 0. 24. The issue arises from Syscall 12 (JumpToUser) accepting an arbitrary entry point address from user-space registers without validation, allowing user-mode processes to execute arbitrary code in kernel mode (Ring 0). This flaw enables an unprivileged local attacker to escalate privileges to kernel level. The vulnerability has been fixed in NovumOS version 0. 24. Until updating, mitigation involves restricting syscall access by running the system in single-user mode without Ring 3 and disabling user-mode processes, running only the kernel shell. No known exploits in the wild have been reported.
AI Analysis
Technical Summary
NovumOS, a custom 32-bit OS written in Zig and x86 Assembly, contains a privilege escalation vulnerability (CVE-2026-40317) in versions before 0.24. The vulnerability is due to Syscall 12 (JumpToUser) accepting an unchecked arbitrary entry point address from user-space registers, permitting any Ring 3 user-mode process to jump to kernel addresses and execute code with Ring 0 privileges. This improper privilege management (CWE-269) allows local attackers to gain full kernel-level control. The issue was resolved in version 0.24. Temporary mitigations include running the OS in single-user mode without Ring 3 and disabling user-mode processes, limiting execution to the kernel shell.
Potential Impact
An unprivileged local user can exploit this vulnerability to execute arbitrary code in kernel mode, resulting in full local privilege escalation. This compromises confidentiality, integrity, and availability of the affected system. The CVSS 3.1 base score is 9.4 (critical), reflecting the high impact and ease of exploitation without user interaction.
Mitigation Recommendations
A fix is available in NovumOS version 0.24. Users should upgrade to this version to fully remediate the vulnerability. If immediate upgrade is not possible, restrict syscall access by running the system in single-user mode without Ring 3 and disable user-mode processes, running only the kernel shell. These mitigations reduce the attack surface until the official fix can be applied.
CVE-2026-40317: CWE-269: Improper Privilege Management in MinecAnton209 NovumOS
Description
CVE-2026-40317 is a critical local privilege escalation vulnerability in NovumOS versions prior to 0. 24. The issue arises from Syscall 12 (JumpToUser) accepting an arbitrary entry point address from user-space registers without validation, allowing user-mode processes to execute arbitrary code in kernel mode (Ring 0). This flaw enables an unprivileged local attacker to escalate privileges to kernel level. The vulnerability has been fixed in NovumOS version 0. 24. Until updating, mitigation involves restricting syscall access by running the system in single-user mode without Ring 3 and disabling user-mode processes, running only the kernel shell. No known exploits in the wild have been reported.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
NovumOS, a custom 32-bit OS written in Zig and x86 Assembly, contains a privilege escalation vulnerability (CVE-2026-40317) in versions before 0.24. The vulnerability is due to Syscall 12 (JumpToUser) accepting an unchecked arbitrary entry point address from user-space registers, permitting any Ring 3 user-mode process to jump to kernel addresses and execute code with Ring 0 privileges. This improper privilege management (CWE-269) allows local attackers to gain full kernel-level control. The issue was resolved in version 0.24. Temporary mitigations include running the OS in single-user mode without Ring 3 and disabling user-mode processes, limiting execution to the kernel shell.
Potential Impact
An unprivileged local user can exploit this vulnerability to execute arbitrary code in kernel mode, resulting in full local privilege escalation. This compromises confidentiality, integrity, and availability of the affected system. The CVSS 3.1 base score is 9.4 (critical), reflecting the high impact and ease of exploitation without user interaction.
Mitigation Recommendations
A fix is available in NovumOS version 0.24. Users should upgrade to this version to fully remediate the vulnerability. If immediate upgrade is not possible, restrict syscall access by running the system in single-user mode without Ring 3 and disable user-mode processes, running only the kernel shell. These mitigations reduce the attack surface until the official fix can be applied.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-04-10T21:41:54.505Z
- Cvss Version
- 3.1
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 69e2d977bdfbbecc59bbf81b
Added to database: 4/18/2026, 1:08:07 AM
Last enriched: 4/18/2026, 1:23:13 AM
Last updated: 4/18/2026, 2:15:09 AM
Views: 5
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