CVE-2026-29645

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Summary

CVECVE-2026-29645
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-20 20:16:48 UTC
Updated2026-04-24 19:25:35 UTC
DescriptionNEMU (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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from ADP

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

EPSS: 0.000310000 probability, percentile 0.090540000 (date 2026-04-27)

Problem Types: CWE-131 | CWE-1287 | n/a | CWE-131 CWE-131 Incorrect Calculation of Buffer Size | CWE-1287 CWE-1287 Improper Validation of Specified Type of Input

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Xiangshan Nemu 2025.12 r1 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
github.com/OpenXiangShan/NEMU/commit/481de637d5fc5838356caee80a79e56a337... [email protected] github.com Patch
github.com/OpenXiangShan/NEMU/pull/958 [email protected] github.com Issue Tracking
docs.riscv.org/reference/isa/unpriv/v-st-ext.html [email protected] docs.riscv.org Product
github.com/OpenXiangShan/NEMU/issues/952 [email protected] github.com Issue Tracking
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
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