SB20261015133 - NULL pointer dereference in Linux kernel s390 kernel

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Main Vulnerability Database SB20261015133

SB20261015133 - NULL pointer dereference in Linux kernel s390 kernel

Published: October 15, 2026

Security Bulletin ID SB20261015133
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-2026-98399)

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 during dump-and-re-IPL processing.

The vulnerability exists due to a null pointer dereference in dump_reipl_run() when preparing lowcore fields without an available re-IPL parameter block. A local user can trigger the affected dump-and-re-IPL processing to cause a denial of service.

HMC FTP boot and QEMU direct kernel boot may leave the IPL parameter block unavailable. If address zero contains readable lowcore data, processing may continue, but the stand-alone dumper enters disabled wait after completing the dump.


Remediation

Install update from vendor's website.

References