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Vulnerability record · CVE-2026-29649 · published 20 April 2026

CVE-2026-29649: Xiangshan nemu vulnerability

Xiangshan · Nemu

NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg[7:4] (CBIE/CBCFE/CBZE-related fields) is incorrectly masked/updated based on menvcfg[7:4], so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to incorrect enforcement of virtualization configuration and may cause unexpected traps or denial of service when executing cache-block management instructions in virtualized contexts (V=1).

9.8 CVSS 3.1 Critical EPSS 0.66% · top 50.4% CWE-693 · CWE-693
9.8CVSS 3.1 base score
0.66%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg[7:4] (CBIE/CBCFE/CBZE-related fields) is incorrectly masked/updated based on menvcfg[7:4], so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to incorrect enforcement of virtualization configuration and may cause unexpected traps or denial of service when executing cache-block management instructions in virtualized contexts (V=1).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://docs.riscv.org/reference/isa/priv/hypervisor.html Product
https://docs.riscv.org/reference/isa/priv/machine.html Product
https://github.com/OpenXiangShan/NEMU/issues/681 Issue Tracking
https://github.com/OpenXiangShan/NEMU/pull/689 Issue TrackingPatch

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Source: NIST National Vulnerability Database (record CVE-2026-29649), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.