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).
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
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Fixes
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Workaround
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References
History
Mon, 20 Apr 2026 20:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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). | |
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Projects
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MITRE
Status: PUBLISHED
Assigner: mitre
Published:
Updated: 2026-04-20T19:56:57.812Z
Reserved: 2026-03-04T00:00:00.000Z
Link: CVE-2026-29649
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-04-20T20:16:48.410
Modified: 2026-04-20T20:16:48.410
Link: CVE-2026-29649
Redhat
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OpenCVE Enrichment
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Weaknesses
No weakness.