CVE-2026-64476 Linux CVE debrief

Who should care

Linux kernel administrators and developers using vfio/pci should assess exposure and verify device power management configurations to prevent unbalanced operations. They should review device power management configurations and update module parameters for vfio-pci to ensure consistency. Additionally, they should confirm whether affected product deployments exist in managed environments and assign an owner for follow-up.

Why it matters

The vulnerability resolution in the Linux kernel affects Linux kernel administrators and developers using vfio/pci, who should assess exposure and verify device power management configurations to prevent unbalanced operations.

• Verify device power management configurations to prevent unbalanced operations
• Assess Linux kernel deployments for vfio/pci usage and potential exposure
• Review and update module parameters for vfio-pci to ensure consistency

Technical summary

The Linux kernel vulnerability was resolved by latching the disable_idle_d3 flag per device in vfio/pci. This change prevents unbalanced power management operations that could occur when the module parameter was changed while devices were already bound to vfio-pci variant drivers. The vulnerability affects Linux kernel administrators and developers using vfio/pci, who should assess exposure and verify device power management configurations to prevent unbalanced operations. The change ensures that power management operations remain balanced even when the module parameter is changed while devices are bound to vfio-pci variant drivers.

Defensive priority

Assess exposure in Linux kernel deployments using vfio/pci and verify device power management configurations.

Recommended defensive actions

• Assess Linux kernel deployments for vfio/pci usage
• Verify device power management configurations
• Review and update module parameters for vfio-pci
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
• Review the supplied official advisory or CVE record to validate affected scope, severity, and vendor guidance
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed
• Track exceptions, retest remediated assets, and close the item only after evidence is documented.

Evidence notes

The CVE record and NVD entry provide details on the vulnerability and its resolution in the Linux kernel. The vulnerability was introduced in vfio-pci and resolved by latching the disable_idle_d3 flag per device. The change ensures that power management operations remain balanced even when the module parameter is changed while devices are bound to vfio-pci variant drivers. Linux kernel administrators and developers should review device power management configurations to prevent exposure.

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.