CVE-2026-29649CRITICAL 9.8EPSS p35.6%

CVE-2026-29649CVE-2026-29649

Description

NEMU contains an implementation flaw in its RISC-V Hypervisor CSR handling where henvcfg[7:4] (CBIE/CBCFE/CBZE-related fields) is incorrectly masked/updated based on menvcfg[7:4], so a machine-mode write to menvcfg can implicitly modify the hypervisor's environment configuration. This can lead to incorrect enforcement of virtualization configuration and may cause unexpected traps or denial of service when executing cache-block management instructions in virtualized contexts (V=1).

Scoring

CVSS 3.19.8 (CRITICAL)
VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS0.45% probability of exploitation · percentile 35.6% · 2026-06-19T12:03:05Z
Published2026-04-20
Last modified2026-04-24

Underlying weaknesses· 1

CWE-693

References

  1. https://docs.riscv.org/reference/isa/priv/hypervisor.html
  2. https://docs.riscv.org/reference/isa/priv/machine.html
  3. https://github.com/OpenXiangShan/NEMU/issues/681
  4. https://github.com/OpenXiangShan/NEMU/pull/689

1

TypeTargetConfidenceTier
WeaknessProtection Mechanism Failurecwe-6930%live

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