CVE-2026-68454
Received Received - Intake

KVM: s390 PCI AIF Enable Handling Without AISB

Publication date: 2026-08-13

Last updated on: 2026-08-13

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: KVM: s390: pci: Fix handling of AIF enable without AISB When a guest seeks to register IRQs without a summary bit specified, ensure that the associated GAITE then stores 0 for the guest AISB location instead of virt_to_phys(page_address(NULL)).

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Meta Information

Published
2026-08-13
Last Modified
2026-08-13
Generated
2026-08-13
AI Q&A
2026-08-13
EPSS Evaluated
N/A
NVD
CVE-2026-68454
EUVD
EUVD-2026-57923

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *

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Exploitability

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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This vulnerability affects the Linux kernel's KVM (Kernel-based Virtual Machine) implementation for s390 (IBM Z) systems. It involves incorrect handling of PCI interrupt registration when a guest attempts to register IRQs without specifying a summary bit. Instead of properly storing 0 for the guest AISB location, the system incorrectly uses virt_to_phys(page_address(NULL)), which could lead to memory access issues or crashes.

Impact Analysis

If you use virtual machines with KVM on s390 systems, this vulnerability could cause instability or crashes when guests attempt to register PCI interrupts without summary bits. This may lead to guest VM failures, data corruption, or denial of service on affected systems.

Mitigation Strategies

Apply the latest Linux kernel patches to address the KVM s390 pci IRQ handling issue. Update to a kernel version that includes the fix for CVE-2026-68454.

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