CVE-2026-29646

Critical severity, CVSS 9.8. EPSS: 0.7% chance of exploitation in the next 30 days.

In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.

Published 2026-04-20. Last modified 2026-06-17.