SB20260814103 - NULL pointer dereference in Linux kernel s390 kvm

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Main Vulnerability Database SB20260814103

SB20260814103 - NULL pointer dereference in Linux kernel s390 kvm

Published: August 14, 2026

Security Bulletin ID SB20260814103
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Denial of service

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-2026-68454)

CWE-ID: CWE-476 - NULL Pointer Dereference

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]


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

The vulnerability exists due to improper handling of a null page reference in kvm_s390_pci_aif_enable() in the KVM s390 PCI code when registering IRQs without a summary bit specified. A local user can request IRQ registration without an AISB to cause a denial of service.

The issue is triggered when a guest enables adapter interruption forwarding without specifying a summary bit.


Remediation

Install update from vendor's website.

References