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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.

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NEMU 安全漏洞

NEMU是XiangShan开源的一个用于教学的全系统模拟器。 NEMU v2025.12.r2之前版本存在安全漏洞，该漏洞源于RISC-V Vector解码器指令验证不当，可能导致特制的二进制文件造成不正确的陷阱行为、架构状态损坏或拒绝服务。

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