OpenXiangShan NEMU stopei/vstopei permission

CVSS Meta Temp Score
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CTI Interest Score
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5.3$0-$5k0.00

Summaryinfo

A vulnerability has been found in OpenXiangShan NEMU and classified as critical. This vulnerability affects unknown code of the component stopei/vstopei. The manipulation leads to permission. This vulnerability is documented as CVE-2026-29647. There is not any exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in OpenXiangShan NEMU (the affected version unknown). It has been rated as critical. This issue affects an unknown part of the component stopei/vstopei. The manipulation with an unknown input leads to a permission vulnerability. Using CWE to declare the problem leads to CWE-275. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In OpenXiangShan NEMU, insufficient Smstateen permission enforcement allows lower-privileged code to access IMSIC state via stopei/vstopei CSRs even when mstateen0.IMSIC is cleared, potentially enabling cross-context information leakage or disruption of interrupt handling.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-29647 since 03/04/2026. The exploitation is known to be easy. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1222 for this issue.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

Name

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.3

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Permission
CWE: CWE-275 / CWE-266
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: github.com

Timelineinfo

03/04/2026 CVE reserved
04/21/2026 +47 days Advisory disclosed
04/21/2026 +0 days VulDB entry created
04/21/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 691
Status: Confirmed

CVE: CVE-2026-29647 (🔒)
GCVE (CVE): GCVE-0-2026-29647
GCVE (VulDB): GCVE-100-358361

Entryinfo

Created: 04/21/2026 06:41
Changes: 04/21/2026 06:41 (55)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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