CVE-2026-29647

Description

In OpenXiangShan NEMU, insufficient Smstateen permission enforcement allows lower-privileged code to access IMSIC state via stopei/vstopei CSRs even when mstateen0.IMSIC is cleared, potentially enabling cross-context information leakage or disruption of interrupt handling.

References

• https://docs.riscv.org/reference/isa/priv/smstateen.html#state-enable-0-registers
• https://github.com/OpenXiangShan/NEMU/issues/691
• https://github.com/OpenXiangShan/XiangShan/pull/3978