CVE-2026-29648

high

Description

In OpenXiangShan NEMU, when Smstateen is enabled, clearing mstateen0.ENVCFG does not correctly restrict access to henvcfg and senvcfg. As a result, less-privileged code may read or write these CSRs without the required exception, potentially bypassing intended state-enable based isolation controls in virtualized or multi-privilege environments.

References

https://github.com/OpenXiangShan/XiangShan/pull/3978

https://github.com/OpenXiangShan/NEMU/issues/690

https://docs.riscv.org/reference/isa/priv/smstateen.html

Details

Source: Mitre, NVD

Published: 2026-04-20

Updated: 2026-04-21

Risk Information

CVSS v2

Base Score: 9

Vector: CVSS2#AV:N/AC:L/Au:S/C:C/I:C/A:C

Severity: High

CVSS v3

Base Score: 8.8

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

Severity: High

EPSS

EPSS: 0.00017