CVE-2026-29646

Summary

In OpenXiangShan NEMU prior to 55295c4, when running with RVH (Hypervisor extension) enabled, a VS-mode guest write to the supervisor interrupt-enable CSR (sie) may be handled incorrectly and can influence machine-level interrupt enable state (mie). This breaks privilege/virtualization isolation and can lead to denial of service or privilege-boundary violation in environments relying on NEMU for correct interrupt virtualization.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: yes
  • Technical Impact: total

References

• https://docs.riscv.org/reference/isa/priv/machine.html
• https://github.com/OpenXiangShan/NEMU/issues/951
• https://github.com/OpenXiangShan/NEMU/pull/938
• https://github.com/OpenXiangShan/NEMU/pull/938/commits/55295c46580456d8d5a9d5736e1fda924b8825ab
• https://docs.riscv.org/reference/isa/unpriv/zicsr.html
• https://docs.riscv.org/reference/isa/priv/supervisor.html
• https://docs.riscv.org/reference/isa/priv/hypervisor.html

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