SB20261015132 - NULL pointer dereference in Linux kernel s390 kernel

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Main Vulnerability Database SB20261015132

SB20261015132 - NULL pointer dereference in Linux kernel s390 kernel

Published: October 15, 2026

Security Bulletin ID SB20261015132
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) NULL pointer dereference (CVE-ID: CVE-2026-98400)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]


The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to a null pointer dereference in set_os_info_reipl_block() when kdump crash shutdown processes an unavailable re-IPL parameter block. A local user can trigger the affected crash-shutdown path to cause a denial of service.

HMC FTP boot and QEMU direct kernel boot may leave the system without an IPL parameter block. The invalid access may succeed by chance if address zero contains readable lowcore data.


Remediation

Install update from vendor's website.

References