CVE-2026-29645

UNKNOWN 0.0

CVSS Score

0.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	n/a
Product	n/a
Published	Apr 20, 2026
Last Updated	Apr 20, 2026

Stay Ahead of the Next One

Get instant alerts for n/a n/a

Be the first to know when new unknown vulnerabilities affecting n/a n/a are published — delivered to Slack, Telegram or Discord.

Get Free Alerts → Free · No credit card · 60 sec setup

Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/OpenXiangShan/NEMU/issues/952 github.com: https://github.com/OpenXiangShan/NEMU/pull/958 github.com: https://github.com/OpenXiangShan/NEMU/commit/481de637d5fc5838356caee80a79e56a33754039 docs.riscv.org: https://docs.riscv.org/reference/isa/unpriv/v-st-ext.html