---
id: CVE-2026-89457
title: >-
  kernel: s390/dasd: Guard sysfs discipline callbacks against unallocated
  private data (CVE-2026-89457)
summary: >-
  A flaw was found in the s390/dasd component of the Linux kernel. An
  unprivileged local user can trigger a null pointer dereference by reading
  specific world-readable sysfs attributes while the device is being brought
  online. This can lead …
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: '2026-09-14T18:25:35+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89457.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89457.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89457'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532055'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89457'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89457'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89457.mbox
  - url: 'https://git.kernel.org/stable/c/644b666c202cce12ccfcf9ded67089b18f4f7659'
  - url: 'https://git.kernel.org/stable/c/4a042d8e5f34282577ece50515cea8bb1246914d'
  - url: 'https://git.kernel.org/stable/c/bd8b4572528f9604a13bf3c7c2a167f5cf222f72'
  - url: 'https://git.kernel.org/stable/c/57db27ccc162afe0726cffec0ae62e410ed2d0e9'
  - url: 'https://git.kernel.org/stable/c/536407b272402af679155910d7fdeeb4834eefb9'
  - url: 'https://git.kernel.org/stable/c/6452c13646af7c13d7f6668b6690cfb2427e7f7b'
  - url: 'https://git.kernel.org/stable/c/449f3bada7a9fad8b8cdf4bb20baf27ee9ca56c5'
  - url: 'https://git.kernel.org/stable/c/2a1780f9fc2493bd34c418a0be6fc58943afcecf'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.0022
epssPercentile: 0.1103
ingestedAt: '2026-09-14T15:23:07.453Z'
---

## Overview

A flaw was found in the s390/dasd component of the Linux kernel. An unprivileged local user can trigger a null pointer dereference by reading specific world-readable sysfs attributes while the device is being brought online. This can lead to a kernel panic, resulting in a denial of service.

## 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-2026-89457.json)

**kernel: s390/dasd: Guard sysfs discipline callbacks against unallocated private data** — 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