CVE-2026-89439

Received Received - Intake

NULL Pointer Dereference in Linux Kernel platform/x86 ISST

Publication date: 2026-09-11

Last updated on: 2026-09-11

Assigner: kernel.org

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[].

CVSS Scores

EPSS Scores

Probability:
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Meta Information

Published

2026-09-11

Last Modified

2026-09-11

Generated

2026-09-12

AI Q&A

2026-09-12

EPSS Evaluated

N/A

NVD

CVE-2026-89439

EUVD

EUVD-2026-76345

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel involves a missing NULL check for sst_inst[] in the ISST driver. The issue occurs when socket loading fails, and the code does not properly validate if sst_inst[] is NULL before accessing it. This could lead to a null pointer dereference or unexpected behavior in the kernel.

Impact Analysis

This vulnerability may cause system instability or crashes if the kernel attempts to access a NULL pointer in the ISST driver. Users could experience kernel panics, unexpected reboots, or degraded system performance. It primarily affects systems using the ISST driver for Intel Speed Select Technology.

Mitigation Strategies

Update the Linux kernel to the latest patched version to resolve the NULL check issue in platform/x86 ISST.

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