CVE-2026-40317NovumOS is a custom 32-bit operating system written in Zig and x86 Assembly.
Updated under an hour ago ()
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It affects minecanton209 novumos. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.3 CRITICAL (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- CWE-20, CWE-269
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
minecanton209 novumos minecanton209:novumos | before 0.24 | NVD |
References
- https://github.com/MinecAnton209/NovumOS/releases/tag/v0.24release-notes
- https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fmexploit, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.