CVE-2026-29648

Summary

In OpenXiangShan NEMU, when Smstateen is enabled, clearing mstateen0.ENVCFG does not correctly restrict access to henvcfg and senvcfg. As a result, less-privileged code may read or write these CSRs without the required exception, potentially bypassing intended state-enable based isolation controls in virtualized or multi-privilege environments.

Affected Software

Weaknesses

• n/a

ADP Enrichment

CISA ADP Vulnrichment

• SSVC:
• Exploitation: poc
  • Automatable: no
  • Technical Impact: total

Additional References

• https://github.com/OpenXiangShan/NEMU/issues/690

References

• https://github.com/OpenXiangShan/NEMU/issues/690
• https://github.com/OpenXiangShan/XiangShan/pull/3978
• https://docs.riscv.org/reference/isa/priv/smstateen.html

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