CVE-2026-29646
- State
- Published
- Severity
- 9.8 Critical
- Published
- Apr 20, 2026
- Updated
- Apr 21, 2026
- Reserved
- Mar 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
- CWE-267 Privilege Defined With Unsafe Actions
Affected Products
| Product | Versions |
|---|---|
n/an/a |
|
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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