---
id: CVE-2026-89442
title: >-
  kernel: platform/x86: ISST: Validate socket ID in clos_assoc ioctl
  (CVE-2026-89442)
summary: >-
  A flaw was found in the Linux kernel. The isst_if_clos_assoc ioctl function in
  the platform/x86: ISST module contains an improper validation of the
  socket_id. This allows a local attacker to cause an out-of-bounds access or a
  NULL pointer …
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-476
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-14'
sourceUpdated: '2026-09-14T21:49:29+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89442.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89442.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89442'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532359'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89442'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89442'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89442.mbox
  - url: 'https://git.kernel.org/stable/c/c847ea4851ecfa3462cc711ded2c3c3dd8d08ab8'
  - url: 'https://git.kernel.org/stable/c/0d90ab5f80e19cddfeb0c9fab47a1f34aa932075'
  - url: 'https://git.kernel.org/stable/c/82e707eff9e3b7ef6d96ecc23ea8876d20c7d6ca'
  - url: 'https://git.kernel.org/stable/c/207b4dc6eb100141b122b2602504a1429a4b6558'
  - url: 'https://git.kernel.org/stable/c/a89f07db0cb95c54dac4a8406c79a04e44a73c3c'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
  - score-dispute
epss: 0.00163
epssPercentile: 0.05938
scores:
  vendor: 5.5
  cna: 7.8
ingestedAt: '2026-09-14T15:23:07.453Z'
---

## Overview

A flaw was found in the Linux kernel. The isst_if_clos_assoc ioctl function in the platform/x86: ISST module contains an improper validation of the socket_id. This allows a local attacker to cause an out-of-bounds access or a NULL pointer dereference. This could lead to a system crash, resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89442.json)

**kernel: platform/x86: ISST: Validate socket ID in clos_assoc ioctl** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-14.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat OpenShift Container Platform 4

## Remediation

Fix deferred