CVE-2026-29646

9.8 criticalEPSS 0.4%

Critical (9.8). EPSS 0.4% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

9.8 critical

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

EPSS: 0.4% chance of exploitation in the next 30 days; higher than 30% of CVEs (scores of 2026-10-31)
CWE: CWE-267
Published: 2026-04-20
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

References

https://docs.riscv.org/reference/isa/priv/hypervisor.html
https://docs.riscv.org/reference/isa/priv/machine.html
https://docs.riscv.org/reference/isa/priv/supervisor.html
https://docs.riscv.org/reference/isa/unpriv/zicsr.html
https://github.com/OpenXiangShan/NEMU/issues/951

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