SB2026090553 - Improper input validation in Linux kernel s390 kvm

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Main Vulnerability Database SB2026090553

SB2026090553 - Improper input validation in Linux kernel s390 kvm

Published: September 5, 2026

Security Bulletin ID SB2026090553
CSH Severity
Low
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Local access
Highest impact Information disclosure

Breakdown by Severity

Low 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Improper input validation (CVE-ID: CVE-2026-80891)

CWE-ID: CWE-20 - Improper input validation

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


The vulnerability allows a local user to cause unsafe pinning of guest pages.

The vulnerability exists due to improper input validation in the KVM s390 PCI adapter-interrupt facility handling when enabling the facility with crafted AIBV or AISB values. A local user can supply an AIBV that spans more than one page or a misaligned AISB address to cause unsafe pinning of guest pages.

The AISB is used when the summary-bit indicator is specified.


Remediation

Install update from vendor's website.

References