---
id: CVE-2026-98593
title: 's390/debug: Fix NULL pointer dereference in debug_info_copy()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  s390/debug: Fix NULL pointer dereference in debug_info_copy()

  When debug_register_static() fails, it clears areas, active_pages and
  active_entries but leaves the area …
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 <
    13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225
  - >-
    Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 <
    a19bede30f0da5ae56782edac62b5998a7434cba
  - >-
    Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 <
    33f706884821da9cb55b650b7b1d4f2bdf800137
  - >-
    Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 <
    2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b
  - >-
    Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 <
    9c6af88fbefbe77608b77409df23a1617e28398c
  - >-
    Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 <
    c593f38e1cdb92f87d01be4c4e5ac12417b1454b
  - >-
    Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 <
    012bfcd5a51082d5a65f096dfb9ca652b5267965
  - Linux 5.15
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:19:05.272Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98593'
references:
  - 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:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.248Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

s390/debug: Fix NULL pointer dereference in debug_info_copy()

When debug_register_static() fails, it clears areas, active_pages and
active_entries but leaves the area bounds unchanged. Copying such an
area, either by opening its view file or via debug_dump(), makes
debug_info_copy() dereference the NULL pointers.

Skip the copy loop when the source has no areas.

## Affected

- `Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 < 13decd3b3b3a4d8a2e603fb8c9ffde0c6be3c225`
- `Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 < a19bede30f0da5ae56782edac62b5998a7434cba`
- `Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 < 33f706884821da9cb55b650b7b1d4f2bdf800137`
- `Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 < 2de9c458cc49d8db6408a7c5fbf0c7c94fe4d52b`
- `Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 < 9c6af88fbefbe77608b77409df23a1617e28398c`
- `Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 < c593f38e1cdb92f87d01be4c4e5ac12417b1454b`
- `Linux >= d72541f945127b4873dace501406a1bc8cd8e1e9 < 012bfcd5a51082d5a65f096dfb9ca652b5267965`
- `Linux 5.15`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.