CVE-2026-94146
BioStar BIOS Update Utility IOCTL BSMEM64_W10.sys sub_110BC write-what-where
- State
- Published
- Severity
- 9.3 Critical
- Published
- Sep 21, 2026
- Updated
- Sep 22, 2026
- Reserved
- Sep 20, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 9.3 Critical | CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:P | VulDB |
| 3.1 | 8.8 High | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R | VulDB |
| 3.0 | 8.8 High | CVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R | VulDB |
| 2.0 | 6.8 Medium | AV:L/AC:L/Au:S/C:C/I:C/A:C/E:POC/RL:ND/RC:UR | VulDB |
Weaknesses
Affected Products
| Product | Versions |
|---|---|
BIOS Update UtilityBioStar |
|
References
- VDB-408061 | BioStar BIOS Update Utility IOCTL BSMEM64_W10.sys sub_110BC write-what-wherevdb-entrytechnical-description
- VDB-408061 | CTI Indicators (IOB, IOC, IOA)signaturepermissions-required
- CVE-2026-94146 | CVE Analysis and Reportthird-party-advisory
- Submit #894066 | BIOSTAR Group BIOS Update Utility 1.9.7.3 Arbitrary Kernel Memory Read/Writethird-party-advisory
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