CVE-2026-29646
CRITICAL EPSS 28.4%
Published Apr 20, 20262mo ago · Modified Jun 17, 20262w ago
9.8 CVSS 3.1
Published Apr 20, 2026 2mo ago
Last Modified Jun 17, 2026 2w ago
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.
CVSS Details
Base Score
Exploitability
Impact
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High
Threat Intelligence
EPSS Exploit Probability
28.4% percentile
Exploit & Patch Status
No Known Exploit
No Patch Available
Weaknesses 1
CWE-267
References 7
- docs.riscv.org https://docs.riscv.org/reference/isa/priv/hypervisor.html
- docs.riscv.org https://docs.riscv.org/reference/isa/priv/machine.html
- docs.riscv.org https://docs.riscv.org/reference/isa/priv/supervisor.html
- docs.riscv.org https://docs.riscv.org/reference/isa/unpriv/zicsr.html
- github.com https://github.com/OpenXiangShan/NEMU/issues/951
- github.com https://github.com/OpenXiangShan/NEMU/pull/938
- github.com https://github.com/OpenXiangShan/NEMU/pull/938/commits/55295c46580456d8d5a9d5736e1fda924b8825ab
Remediation
No remediation data recorded yet
Check vendor advisories and the NVD entry for patch availability.