FMTSWriteUseIntelLib: FMTS SMM IHISI Buffer Overflow (CVE-2026-9805) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-9805

FMTSWriteUseIntelLib: FMTS SMM IHISI Buffer Overflow

Answer in brief

CVE-2026-9805 records a Unknown severity vulnerability in FMTSWriteUseIntelLib: FMTS SMM IHISI Buffer Overflow. The current sources do not mark it as known exploited. The current feed maps Insyde Software/InsydeH2O (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 26, 2026Updated Aug 26, 2026Source checked Aug 26, 2026First seen by HOL Aug 26, 2026Material review Aug 26, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Insyde Software/InsydeH2O (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Insyde Software/InsydeH2Ogeneric	See in the Solution	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Insyde Software/InsydeH2O.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 26, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 26, 2026

Sources and claim methodology

Source referenceinsyde.com

Upstream source description

SMM IHISI command handler, FMTSWriteUseIntelLib, for FMTS command 0x32, read and write data without checking buffer size and could cause buffer overflow.

Quoted source text, attributed separately from HOL analysis.