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CVE-2026-29649

Critical

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).

SeverityCritical
CVSS9.8
Exploit probability—
ProductXiangshan Nemu
PublishedApr 20, 2026
First seenApr 20, 2026
Weakness typeCWE-693CWE-693

How to fix

Sources list no fixed version or patch link for this vulnerability.

Affected products

ProductAffected versionsFixed in
xiangshan nemuNo range specified—

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