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CVE-2026-29648

8.8 · HIGH

In OpenXiangShan NEMU, when Smstateen is enabled, clearing mstateen0.ENVCFG does not correctly restrict access to henvcfg and senvcfg.

Published Apr 20, 2026CWE-269EPSS 0.54%

Overview

CVE-2026-29648 is a high-severity vulnerability. It was published on April 20, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refdocs.riscv.org/reference/isa/priv/smstateen.htmlGitHubgithub.com/OpenXiangShan/NEMU/issues/690GitHubgithub.com/OpenXiangShan/XiangShan/pull/3978GitHubgithub.com/OpenXiangShan/NEMU/issues/690

How CyberStrike helps

Frequently asked questions

What is CVE-2026-29648?

CVE-2026-29648 is a high-severity vulnerability. It was published on April 20, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-29648?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-29648?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-29648?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-29648 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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