platform/x86: ISST: Add a NULL check for sst_inst[] (CVE-2026-89439) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89439

platform/x86: ISST: Add a NULL check for sst_inst[]

Answer in brief

CVE-2026-89439 records a Unknown severity vulnerability in platform/x86: ISST: Add a NULL check for sst_inst[]. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (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 Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

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 Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=d805456c712f93ba8a012430f2a93bec133b6ff4 <49a95fe1f64f41c2e8959e525aefdb10f23b293e \|\| >=d805456c712f93ba8a012430f2a93bec133b6ff4 <c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa \|\| >=d805456c712f93ba8a012430f2a93bec133b6ff4 <ef7975af15126dd70ace519da7bb33f2848b9064 \|\| >=d805456c712f93ba8a012430f2a93bec133b6ff4 <3de2776e9d7073765c10c2326c2bda5926811ea6	49a95fe1f64f41c2e8959e525aefdb10f23b293e, c280fcd53b938b70c7dee9ce1a66b32bd6e5ebaa, ef7975af15126dd70ace519da7bb33f2848b9064, 3de2776e9d7073765c10c2326c2bda5926811ea6
Linux/Linuxgeneric	6.4	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 49a95fe1f64f41c2e8959e525aefdb10f23b293e if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: platform/x86: ISST: Add a NULL check for sst_inst[] To be consistent with other places, add a NULL check for failed socket loading by checking isst_common.sst_inst[].

Quoted source text, attributed separately from HOL analysis.