---
id: CVE-2026-98593
title: >-
  kernel: s390/debug: Fix NULL pointer dereference in debug_info_copy()
  (CVE-2026-98593)
summary: >-
  A flaw was found in the Linux kernel's s390 debug subsystem. This
  vulnerability allows a local user to cause a Denial of Service (DoS) through a
  kernel crash. When static debug registration encounters an error, internal
  memory pointers are…
severity: medium
cvss: 4.1
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:H/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 6
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T04:52:19+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98593.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98593.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98593'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555038'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98593'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98593'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98593.mbox
  - url: 'https://git.kernel.org/stable/c/13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225'
  - url: 'https://git.kernel.org/stable/c/a19bede30f0da5ae56782edac62b5998a7434cba'
  - url: 'https://git.kernel.org/stable/c/33f706884821da9cb55b650b7b1d4f2bdf800137'
  - url: 'https://git.kernel.org/stable/c/2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b'
  - url: 'https://git.kernel.org/stable/c/9c6af88fbefbe77608b77409df23a1617e28398c'
  - url: 'https://git.kernel.org/stable/c/c593f38e1cdb92f87d01be4c4e5ac12417b1454b'
  - url: 'https://git.kernel.org/stable/c/012bfcd5a51082d5a65f096dfb9ca652b5267965'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00173
epssPercentile: 0.06622
ingestedAt: '2026-10-18T15:45:12.248Z'
---

## Overview

A flaw was found in the Linux kernel's s390 debug subsystem. This vulnerability allows a local user to cause a Denial of Service (DoS) through a kernel crash. When static debug registration encounters an error, internal memory pointers are cleared while boundary records remain active. A local user attempting to read or copy the affected debug area, such as by opening its view file, triggers a NULL pointer dereference (an invalid memory access) that crashes the kernel.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98593.json)

**kernel: s390/debug: Fix NULL pointer dereference in debug_info_copy()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope