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).
Metrics
Affected Vendors & Products
References
History
Fri, 24 Apr 2026 19:30:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Xiangshan
Xiangshan nemu |
|
| CPEs | cpe:2.3:a:xiangshan:nemu:-:*:*:*:*:*:*:* | |
| Vendors & Products |
Xiangshan
Xiangshan nemu |
Wed, 22 Apr 2026 09:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | RISC‑V Hypervisor Unauthorized Configuration Modification Causing Denial of Service |
Wed, 22 Apr 2026 07:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | RISC‑V Hypervisor Unauthorized Configuration Modification Causing Denial of Service | |
| Weaknesses | CWE-269 CWE-284 |
Wed, 22 Apr 2026 04:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Vulnerability in NEMU RISC‑V Hypervisor CSR Handling Allows Implicit Modification of Hypervisor Configuration Leading to Denial of Service |
Wed, 22 Apr 2026 00:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Weaknesses | CWE-693 | |
| Metrics |
cvssV3_1
|
Tue, 21 Apr 2026 16:15:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Title | Vulnerability in NEMU RISC‑V Hypervisor CSR Handling Allows Implicit Modification of Hypervisor Configuration Leading to Denial of Service | |
| Weaknesses | CWE-269 CWE-284 |
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). | |
| References |
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Status: PUBLISHED
Assigner: mitre
Published: 2026-04-20T00:00:00.000Z
Updated: 2026-04-21T19:51:00.279Z
Reserved: 2026-03-04T00:00:00.000Z
Link: CVE-2026-29649
Updated: 2026-04-21T13:49:49.167Z
Status : Analyzed
Published: 2026-04-20T20:16:48.410
Modified: 2026-04-24T19:23:46.560
Link: CVE-2026-29649
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