CVE-2026-29649criticalCWE-693

CVE-2026-29649

Published 20 Apr 2026 · Updated 21 Apr 2026

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28Vexday Risk Score

No sign of exploitation. No public exploitation artifact known so far.

ssvc Trackcvss 9.8epss 0.4%

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).

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

n/a · n/a

References

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