# CVE-2026-29646

> Vulnerability · severity: **CRITICAL** (CVSS 9.8).

## Description

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.

## Key facts

- **CVE ID:** CVE-2026-29646
- **Published:** 2026-04-20
- **CVSS severity:** CRITICAL
- **CVSS base score:** 9.8
- **CWE codes:** CWE-267

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-29646

## Citation

> AI Analytics. CVE-2026-29646. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-29646. Derived from NIST NVD. Licensed CC0.

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