CVE-2026-29645
HighSummary
NEMU (OpenXiangShan/NEMU) przed wersją v2025.12.r2 zawiera błąd w walidacji instrukcji w dekoderze RISC-V Vector (RVV). Błąd ten pozwala na niewłaściwe interpretowanie nieprawidłowych kodów instrukcji OP-V jako instrukcji konfiguracyjnych vset*, co może prowadzić do nieprawidłowego działania systemu.
Risk Assessment
Organizacje mogą być narażone na uszkodzenie stanu architektury oraz nieprawidłowe zachowanie systemu, co może prowadzić do odmowy usługi w systemach korzystających z NEMU. Wykorzystanie tej podatności może skutkować poważnymi konsekwencjami dla bezpieczeństwa i stabilności systemów.
Recommendation
Zaleca się aktualizację NEMU do wersji v2025.12.r2 lub nowszej, aby usunąć tę podatność. Dodatkowo, należy monitorować i weryfikować dostarczane binaria RISC-V w celu zapobiegania potencjalnym atakom.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

