CVEvulnerability

CVE-2026-29645

7.5 HIGH Published 2026-04-20 Modified 2026-06-17 Official page ↗
Status
Analyzed
Published
2026-04-20
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 (134c704f-9b21-4f2e-91b3-4a467353bcc0)
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
CWE-1287, CWE-131

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.

Affected configurations

• xiangshan nemu 2025.12

Related

Weakness · CWE (2)

  • CWE-1287 Improper Validation of Specified Type of Input weakness
  • CWE-131 Incorrect Calculation of Buffer Size weakness

References