CVE-2026-40317

{"id": "CVE-2026-40317", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-40317", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "version": "2.0.3", "timestamp": "2026-04-20T15:26:18.306426Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "CHANGED", "version": "3.1", "baseScore": 9.3, "attackVector": "LOCAL", "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "HIGH"}, "impactScore": 6.0, "exploitabilityScore": 2.5}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "MinecAnton209", "product": "NovumOS", "versions": [{"status": "affected", "version": "< 0.24"}]}]}], "published": "2026-04-18T01:16:19.380", "references": [{"url": "https://github.com/MinecAnton209/NovumOS/releases/tag/v0.24", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fm", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fm", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-20"}, {"lang": "en", "value": "CWE-269"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "NovumOS es un sistema operativo personalizado de 32 bits escrito en Zig y Ensamblador x86. En versiones anteriores a la 0.24, la llamada al sistema 12 (JumpToUser) acepta una direcci\u00f3n de punto de entrada arbitraria de los registros del espacio de usuario sin validaci\u00f3n, permitiendo que cualquier proceso en modo de usuario de Anillo 3 salte a direcciones del kernel y ejecute c\u00f3digo arbitrario en contexto de Anillo 0, lo que resulta en una escalada de privilegios local. Este problema ha sido solucionado en la versi\u00f3n 0.24. Si los desarrolladores no pueden actualizar inmediatamente, deben restringir el acceso a las llamadas al sistema ejecutando el sistema en modo de usuario \u00fanico sin Anillo 3, y deshabilitar los procesos en modo de usuario ejecutando solo el shell del kernel sin procesos de usuario. Este problema ha sido solucionado en la versi\u00f3n 0.24."}], "lastModified": "2026-10-26T21:10:00.170", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:minecanton209:novumos:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "A40C9D50-FA65-41F9-859B-D8C31D3E55AC", "versionEndExcluding": "0.24"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}