Critical severity9.8NVD Advisory· Published Apr 20, 2026· Updated Apr 21, 2026
CVE-2026-29646
CVE-2026-29646
Description
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.
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Affected products
1- Range: <55295c4
Patches
Vulnerability mechanics
References
7- docs.riscv.org/reference/isa/priv/hypervisor.htmlnvd
- docs.riscv.org/reference/isa/priv/machine.htmlnvd
- docs.riscv.org/reference/isa/priv/supervisor.htmlnvd
- docs.riscv.org/reference/isa/unpriv/zicsr.htmlnvd
- github.com/OpenXiangShan/NEMU/issues/951nvd
- github.com/OpenXiangShan/NEMU/pull/938nvd
- github.com/OpenXiangShan/NEMU/pull/938/commits/55295c46580456d8d5a9d5736e1fda924b8825abnvd
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