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6 vulnerabilities by xiangshan
CVE-2026-29649 (GCVE-0-2026-29649)
Vulnerability from nvd – Published: 2026-04-20 00:00 – Updated: 2026-04-21 19:51
VLAI
Summary
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).
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-693 - Protection Mechanism Failure
Assigner
References
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CVE-2026-29645 (GCVE-0-2026-29645)
Vulnerability from nvd – Published: 2026-04-20 00:00 – Updated: 2026-04-21 19:51
VLAI
Summary
NEMU (OpenXiangShan/NEMU) before v2025.12.r2 contains an improper instruction-validation flaw in its RISC-V Vector (RVV) decoder. The decoder does not correctly validate the funct3 field when decoding vsetvli/vsetivli/vsetvl, allowing certain invalid OP-V instruction encodings to be misinterpreted and executed as vset* configuration instructions rather than raising an illegal-instruction exception. This can be exploited by providing crafted RISC-V binaries to cause incorrect trap behavior, architectural state corruption/divergence, and potential denial of service in systems that rely on NEMU for correct execution or sandboxing.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
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CVE-2025-63094 (GCVE-0-2025-63094)
Vulnerability from nvd – Published: 2025-12-10 00:00 – Updated: 2025-12-18 19:07
VLAI
Summary
XiangShan Nanhu V2 and XiangShan Kunmighu V3 were discovered to use speculative execution and indirect branch prediction, allowing attackers to access sensitive information via side-channel analysis of the data cache.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
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CVE-2026-29645 (GCVE-0-2026-29645)
Vulnerability from cvelistv5 – Published: 2026-04-20 00:00 – Updated: 2026-04-21 19:51
VLAI
Summary
NEMU (OpenXiangShan/NEMU) before v2025.12.r2 contains an improper instruction-validation flaw in its RISC-V Vector (RVV) decoder. The decoder does not correctly validate the funct3 field when decoding vsetvli/vsetivli/vsetvl, allowing certain invalid OP-V instruction encodings to be misinterpreted and executed as vset* configuration instructions rather than raising an illegal-instruction exception. This can be exploited by providing crafted RISC-V binaries to cause incorrect trap behavior, architectural state corruption/divergence, and potential denial of service in systems that rely on NEMU for correct execution or sandboxing.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
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CVE-2026-29649 (GCVE-0-2026-29649)
Vulnerability from cvelistv5 – Published: 2026-04-20 00:00 – Updated: 2026-04-21 19:51
VLAI
Summary
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).
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator (v2.0.3)
CWE
- n/a
- CWE-693 - Protection Mechanism Failure
Assigner
References
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CVE-2025-63094 (GCVE-0-2025-63094)
Vulnerability from cvelistv5 – Published: 2025-12-10 00:00 – Updated: 2025-12-18 19:07
VLAI
Summary
XiangShan Nanhu V2 and XiangShan Kunmighu V3 were discovered to use speculative execution and indirect branch prediction, allowing attackers to access sensitive information via side-channel analysis of the data cache.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
Assigner
References
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"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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}
],
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{
"descriptions": [
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"description": "CWE-200 Exposure of Sensitive Information to an Unauthorized Actor",
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}
]
},
{
"descriptions": [
{
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]
}
],
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"product": "n/a",
"vendor": "n/a",
"versions": [
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"version": "n/a"
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"descriptions": [
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"lang": "en",
"value": "XiangShan Nanhu V2 and XiangShan Kunmighu V3 were discovered to use speculative execution and indirect branch prediction, allowing attackers to access sensitive information via side-channel analysis of the data cache."
}
],
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"references": [
{
"url": "https://github.com/necst/aca25-xiangshan-spectre/blob/main/README.md"
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{
"url": "https://github.com/necst/aca25-xiangshan-spectre"
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]
}
},
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"datePublished": "2025-12-10T00:00:00.000Z",
"dateReserved": "2025-10-27T00:00:00.000Z",
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