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CVE-2026-94146— BioStar BIOS Update Utility IOCTL BSMEM64_W10.sys sub_110BC write-what-where

Quick assessment

Affected

BioStar BIOS Update Utility

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 BioStar BIOS 更新工具 1.9.7.3 中发现一个安全漏洞。该漏洞影响组件 IOCTL 处理程序中 BSMEM64_W10.sys 文件的 sub_110BC 函数。通过操纵参数 PhysicalAddress/Size，可引发“写什么到哪里”（write-what-where）条件，即攻击者能够控制写入的数据内容及其目标地址。利用此漏洞需要本地访问权限。相关漏洞利用代码已公开，并可能被用于实际攻击。厂商虽已在此漏洞披露初期收到通知，但至今未作出任何回应。

CVSS 8.8 · High EPSS 0.18% · P8 Updated Sep 23, 2026

Possible ATT&CK Techniques 1 AI

T1543 · Create or Modify System Process

Affected Version Matrix 1

Vendor	Product	Version Range	Status
BioStar	BIOS Update Utility	`1.9.7.3`	affected

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Vulnerability Information

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Vulnerability Title

BioStar BIOS Update Utility IOCTL BSMEM64_W10.sys sub_110BC write-what-where

Source: CVE Program / CVE List V5

Vulnerability Description

A vulnerability was found in BioStar BIOS Update Utility 1.9.7.3. This issue affects the function sub_110BC of the file BSMEM64_W10.sys of the component IOCTL Handler. The manipulation of the argument PhysicalAddress/Size results in write-what-where condition. Attacking locally is a requirement. The exploit has been made public and could be used. The vendor was contacted early about this disclosure but did not respond in any way.

Source: CVE Program / CVE List V5

CVSS Information

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

Source: CVE Program / CVE List V5

Vulnerability Type

任意地址可写任意内容条件

Source: CVE Program / CVE List V5

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
BioStar	BIOS Update Utility	1.9.7.3	`cpe:2.3:o:biostar:bios_update_utility::::::::`

II. Public POCs for CVE-2026-94146

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-94146

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Other References for CVE-2026-94146 (2)

🔗 VulDB | Security Check third-party-advisory
🔗 VulDB | Security Check third-party-advisory

https://www.cve.org/CVERecord?id=CVE-2026-94146

Same Patch Batch · BioStar · 2026-09-21 · 4 CVEs total

CVE-2026-94128	8.8 HIGH	BioStar VIVID LED DJ IOCTL BS_LED64.sys sub_1105C write-what-where
CVE-2026-94129	8.8 HIGH	BioStar VALKYRIE AURORA IOCTL BS_RVSIO64.sys sub_1105C write-what-where
CVE-2026-94142	8.8 HIGH	BioStar Temperature Monitor Utility IOCTL BS_HWMIO64_W10.sys sub_1105C write-what-where

IV. Related Vulnerabilities

Same vendor: BioStar

Same weakness: CWE-123