---
id: CVE-2026-97980
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

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

  Commit a2cec6863709 ("s390/debug: Add s390dbf kernel parameter")
  incorrectly removed a null-id check from…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

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

  Commit a2cec6863709 ("s390/debug: Add s390dbf kernel parameter")
  incorrectly removed a null-id check from…
severity: medium
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= a2cec6863709d6673a025acc066c962b85a75842 <
    716e1cd3783806929407dbd596e6b1118971eb9e
  - >-
    Linux >= a2cec6863709d6673a025acc066c962b85a75842 <
    b1eb31d533cdfcae1011ed53850d52f36afe5774
  - Linux 7.2
published: '2026-09-25'
updated: '2026-09-25'
sourceUpdated: '2026-09-25T11:17:26.023'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97980'
references:
  - url: 'https://git.kernel.org/stable/c/716e1cd3783806929407dbd596e6b1118971eb9e'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b1eb31d533cdfcae1011ed53850d52f36afe5774'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97980.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97980'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541049'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97980'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97980'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97980.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
ingestedAt: '2026-09-25T11:06:38.869Z'
epss: 0.00155
epssPercentile: 0.04618
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
---

## Overview

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

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

Commit a2cec6863709 ("s390/debug: Add s390dbf kernel parameter")
incorrectly removed a null-id check from debug_set_level(), introducing
a possible NULL pointer dereference for debug-API users that put
debug_register() results unchecked into debug_set_level().

Fix this by moving the check from the internal _debug_set_level()
variant back to the external debug_set_level() wrapper.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · affected: Red Hat Enterprise Linux 6 · no fix planned: Red Hat Enterprise Linux 6 · updated 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97980.json)