PT-2026-33547 · Novumos · Novumos

Minecanton209 · CVE-2026-40317 · Published 2026-04-18 · Updated 2026-04-20

Positive Technologies (AI Summary)

CVSS v3.1

9.3

Critical

Base vector

AV:L/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Name of the Vulnerable Software and Affected Versions NovumOS versions prior to 0.24

Description Syscall 12 ('JumpToUser') accepts an arbitrary entry point address from user-space registers without validation. This allows a Ring 3 user-mode process to jump to kernel addresses and execute arbitrary code in Ring 0 context, leading to local privilege escalation. Ring 3 refers to the least privileged user mode, while Ring 0 refers to the most privileged kernel mode.

Recommendations Update to version 0.24. Restrict syscall access by running the system in single-user mode without Ring 3 and disable user-mode processes by only running the kernel shell with no user processes.

Exploit

Fix

LPE

RCE

Improper Privilege Management

Weakness Enumeration

CWE-20

CWE-269

Related Identifiers

CVE-2026-40317

GHSA-XJX3-GJH9-45FM

Affected Products

Novumos

References · 8

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/40xxx/CVE-2026-40317.json · Exploit
• 🔥 https://github.com/MinecAnton209/NovumOS/security/advisories/GHSA-xjx3-gjh9-45fm · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2026-40317 · Security Note
• https://osv.dev/vulnerability/CVE-2026-40317 · Vendor Advisory
• https://github.com/MinecAnton209/NovumOS/releases/tag/v0.24 · Note
• https://twitter.com/CVEnew/status/2045467339215237589 · Twitter Post
• https://twitter.com/0dayPublishing/status/2046256297478132169 · Twitter Post
• https://twitter.com/PurpleOps_io/status/2045889307081109913 · Twitter Post