CVE-2026-64474 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and system administrators responsible for Linux kernel updates and vulnerability management. These individuals should assess exposure, apply patches, and monitor systems for potential incidents related to the CVE-2026-64474 vulnerability.

Why it matters

CVE-2026-64474 is a Linux kernel vulnerability that can cause an infinite loop in the vfio_mig_get_next_state() function. Defenders should assess exposure, apply patches, and monitor systems for potential incidents.

• Potential soft lockup and panic incidents require monitoring and mitigation
• Assess exposure and apply patches for impacted Linux kernel versions
• Verify Linux kernel versions and vfio functionality for vulnerability

Technical summary

The vfio_mig_get_next_state() function in the Linux kernel can enter an infinite loop when encountering a blocked transition, potentially causing a soft lockup and panic. This issue has been resolved by terminating the skip loop on the ERROR sentinel, allowing the function to report -EINVAL and prevent the soft lockup and panic. The vulnerability is related to the handling of optional states in the vfio_mig_get_next_state() function, which can lead to an infinite loop when a blocked transition is encountered. Defenders should assess exposure, apply patches, and monitor systems for potential incidents.

Defensive priority

Assess exposure and apply patches for Linux kernel versions impacted by CVE-2026-64474, prioritizing systems with vfio functionality.

Recommended defensive actions

• Assess exposure by checking Linux kernel versions and vfio functionality
• Apply patches or updates for affected Linux kernel versions
• Monitor system logs for potential soft lockup and panic incidents
• 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 entry provide details on the vulnerability, including its description and affected systems. However, specific version information and exploitation details are not provided. The vulnerability is related to the Linux kernel's vfio_mig_get_next_state() function, which can cause an infinite loop when encountering a blocked transition. The issue has been resolved in the kernel, and defenders should assess exposure, apply patches, and monitor systems for potential incidents.

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.