CVE-2026-89795 Linux CVE debrief

Who should care

Linux kernel maintainers, users, and administrators of s390 systems should assess exposure and verify affected versions. They should review and apply patches from the Linux kernel maintainers, monitor system logs for potential exploitation attempts, and review compensating controls for exposed systems.

Why it matters

The vulnerability affects PCI slot reset on s390 systems, which use a machine level hypervisor. Linux kernel maintainers and users should assess exposure and verify affected versions.

• Verify affected versions and assess exposure
• Apply patches from the Linux kernel maintainers
• Monitor system logs for potential exploitation attempts

Technical summary

The Linux kernel vulnerability affects PCI slot reset on s390 systems, which use a machine level hypervisor. The issue arises from the current implementation of pci_create_slot(), which assigns the same pci_slot object to multifunction devices. This causes problems when resetting a function through the hotplug driver's slot_reset() interface, leading to the wrong function being reset and memory leaks. Linux kernel maintainers and users should assess exposure and verify affected versions to address this vulnerability.

Defensive priority

Linux kernel maintainers and users should assess exposure and verify affected versions.

Recommended defensive actions

• Assess exposure and verify affected versions
• Review and apply patches from the Linux kernel maintainers
• Monitor system logs for potential exploitation attempts
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability. However, the corpus does not establish versions, exploitation, impact, or remediation, which require verification from the supplied official sources. Linux kernel maintainers and users should verify affected versions, assess exposure, and review patches. The vulnerability affects PCI slot reset on s390 systems, which use a machine level hypervisor.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.