Is this vulnerability remotely exploitable?

It is not directly network-exploitable by itself. Exploitation requires the ability to run code on a system using the affected NEMU environment, such as guest or kernel code within an emulator or verification setup. However, any remote vector that allows code execution in a guest or lower-privilege context could leverage this weakness to escalate its impact.

What level of access does an attacker need to exploit this issue?

The attacker needs the ability to execute instructions at a lower privilege level (e.g., supervisor, virtual supervisor, or similar) in a RISC‑V environment where Smstateen is enabled and mstateen0.ENVCFG is expected to restrict CSR access. From there, they can attempt CSR operations on henvcfg and senvcfg that should normally be blocked.

What is the safest general fix pattern for this vulnerability class?

The general fix is to centralize and enforce privilege and state-based access control for all CSRs, ensuring that each access is validated against both the current privilege level and any relevant state-enable bits. Implementations should rely on shared helpers or tables that encode CSR permissions, rather than duplicating access logic in multiple places.

Severity:

HIGH RISK

(8.8)

Improper Privilege Management (CWE-269) in OpenXiangShan NEMU Smstateen CSR Handling

CVE-2026-29648

Published:

Apr 20, 2026

Status:

Deferred

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

NDV

Recent Vulnerabilities

CWE-74;CWE-89

HIGH RISK

HIGH

(7.3)

SQL Injection via Unsanitized ID Parameter (CWE-89) in Pharmacy Sales and Inventory System /ajax.php

Database Compromise and Data Integrity Loss

April 27, 2026

CWE-863

HIGH RISK

HIGH

(8.5)

Incorrect Authorization (CWE-863) in OpenClaw chat.send Session Management

Privilege Escalation and Unauthorized Session Control

April 27, 2026

Vulnerability Type

Category:

Improper Privilege Management

CWE:

CWE-269

Impact:

Privilege Bypass / Isolation Break

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

Vulnerability Type

Category:

Improper Privilege Management

CWE:

CWE-269

Impact:

Privilege Bypass / Isolation Break

Severity:

HIGH RISK

(8.8)

CVSS Version:

3.1

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Ask AI for summary of CodeAnt

Improper Privilege Management (CWE-269) in OpenXiangShan NEMU Smstateen CSR Handling

Summary

Affected Context

Exploit Preconditions

Why This Happens

Potential Impact

General Mitigation Guidance

How Teams Detect Issues Like This

Frequently Asked Questions

Source

Recent Vulnerabilities

HIGH RISK

HIGH

(7.3)

SQL Injection via Unsanitized ID Parameter (CWE-89) in Pharmacy Sales and Inventory System /ajax.php

HIGH RISK

HIGH

(8.5)

Incorrect Authorization (CWE-863) in OpenClaw chat.send Session Management

Vulnerability Type

Vulnerability Type

Vulnerability Type

Catch This CVE While Code Is Being Written

Ship clean & secure code faster

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