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… (CVE-2026-68454)
A vulnerability in the Linux kernel's KVM s390 PCI subsystem was resolved. The issue involved incorrect handling when a guest registers IRQs without specifying a summary bit, causing improper storage of the guest AISB location. This could lead to incorrect guest interrupt handling. The vulnerability has been fixed by ensuring the GAITE stores zero for the guest AISB location in these cases.
AI Analysis
Technical Summary
The Linux kernel vulnerability CVE-2026-68454 affects the KVM s390 PCI component. When a guest attempts to register IRQs without a summary bit, the kernel previously stored an incorrect physical address for the guest AISB location (virt_to_phys(page_address(NULL))). The fix ensures that the associated GAITE stores zero instead, correcting the handling of AIF enable without AISB. This resolves potential issues in guest interrupt management.
Potential Impact
The vulnerability could cause improper handling of guest interrupts in virtualized environments using KVM on s390 architectures. This may affect the stability or correctness of guest virtual machines relying on PCI interrupt registration without a summary bit. No direct exploit or broader impact details are provided.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel. Users should apply the official kernel updates that include this patch. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.
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… (CVE-2026-68454)
Description
A vulnerability in the Linux kernel's KVM s390 PCI subsystem was resolved. The issue involved incorrect handling when a guest registers IRQs without specifying a summary bit, causing improper storage of the guest AISB location. This could lead to incorrect guest interrupt handling. The vulnerability has been fixed by ensuring the GAITE stores zero for the guest AISB location in these cases.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel vulnerability CVE-2026-68454 affects the KVM s390 PCI component. When a guest attempts to register IRQs without a summary bit, the kernel previously stored an incorrect physical address for the guest AISB location (virt_to_phys(page_address(NULL))). The fix ensures that the associated GAITE stores zero instead, correcting the handling of AIF enable without AISB. This resolves potential issues in guest interrupt management.
Potential Impact
The vulnerability could cause improper handling of guest interrupts in virtualized environments using KVM on s390 architectures. This may affect the stability or correctness of guest virtual machines relying on PCI interrupt registration without a summary bit. No direct exploit or broader impact details are provided.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel. Users should apply the official kernel updates that include this patch. Patch status is not explicitly confirmed in the provided data; therefore, check the vendor advisory for current remediation guidance.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-4h5w-742q-hw8j
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-68454"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a7e0350bf8831d5398f6f41
Added to database: 08/13/2026, 17:48:00 UTC
Last enriched: 08/13/2026, 17:53:08 UTC
Last updated: 08/13/2026, 17:53:08 UTC
Views: 2
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