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Vulnerability record · CVE-2026-29648 · published 20 April 2026

CVE-2026-29648: Improper privilege management vulnerability

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.

8.8 CVSS 3.1 High EPSS 0.54% · top 57.0% CWE-269 · Improper privilege management Deferred
8.8CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
0Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

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.

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

References

LinkTags
https://docs.riscv.org/reference/isa/priv/smstateen.html
https://github.com/OpenXiangShan/NEMU/issues/690
https://github.com/OpenXiangShan/XiangShan/pull/3978
https://github.com/OpenXiangShan/NEMU/issues/690

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Source: NIST National Vulnerability Database (record CVE-2026-29648), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.