CVE-2026-29645 - NEMU RISC-V Vector Decoder Improper Instruction Validation

CVE-2026-29645 - NEMU RISC-V Vector Decoder Improper Instruction Validation

https://cvefeed.io/rssfeed/latest.atom / Tue, 04/21/2026 - 01:54
CVE ID :CVE-2026-29645
Published : April 20, 2026, 8:16 p.m. | 1 hour, 55 minutes ago
Description :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: 0.0 | NA
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