CVE-2026-40317
Last modified
CVE-2026-40317 is a critical-severity vulnerability rated 9.3/10 on the CVSS scale. 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. EPSS estimates a 0.22% chance of exploitation in the next 30 days.
Description
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Minecanton209 | Novumos | < 0.24 |
References
- https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fmExploit, Vendor Advisory
- https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fmExploit, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
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