CVE-2026-9805— FMTSWriteUseIntelLib: FMTS SMM IHISI Buffer Overflow
Quick assessment
Affected
Insyde Software InsydeH2O
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.
Insyde InsydeH2O是Insyde公司的一款可定制固件代码库。 InsydeH2O存在缓冲区错误漏洞，该漏洞源于SMM IHISI命令处理程序的FMTSWriteUseIntelLib功能对FMTS命令0x32在读写数据时未检查缓冲区大小，可能导致缓冲区溢出。
Possible ATT&CK Techniques 1 AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 1
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Insyde Software | InsydeH2O | See in the Solution |
affected |
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I. Basic Information for CVE-2026-9805
Vulnerability Information
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Vulnerability Title
FMTSWriteUseIntelLib: FMTS SMM IHISI Buffer Overflow
Source: CVE Program / CVE List V5
Vulnerability Description
SMM IHISI command handler, FMTSWriteUseIntelLib, for FMTS command 0x32, read and write data without checking buffer size and could cause buffer overflow.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:P/AC:H/PR:H/UI:R/S:U/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
InsydeH2O 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Insyde InsydeH2O是Insyde公司的一款可定制固件代码库。 InsydeH2O存在缓冲区错误漏洞，该漏洞源于SMM IHISI命令处理程序的FMTSWriteUseIntelLib功能对FMTS命令0x32在读写数据时未检查缓冲区大小，可能导致缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Insyde Software | InsydeH2O | See in the Solution | - |
|
II. Public POCs for CVE-2026-9805
| # | POC Description | Source Link | Shenlong Link |
|---|
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Vendor Advisories for CVE-2026-9805 (1)
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V. Comments for CVE-2026-9805
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