CVE-2026-80765 Linux CVE debrief

Who should care

Linux kernel maintainers, Hyper-V administrators, and security teams responsible for guest systems should be aware of this vulnerability and take immediate action to prevent potential crashes and ensure system availability. They should verify and apply patches for the Linux kernel HID hyperv component, review Hyper-V host and backend configurations for secure communication, and monitor guest systems for potential crashes or instability.

Why it matters

A vulnerability in the Linux kernel's HID hyperv component can be exploited by a malicious Hyper-V host or backend to crash a guest, requiring verification and application of patches, review of Hyper-V configurations, and monitoring of guest systems.

• Verify and apply patches for Linux kernel HID hyperv component to prevent potential crashes
• Review Hyper-V host and backend configurations for secure communication to reduce attack surface
• Monitor guest systems for potential crashes or instability to ensure system availability

Technical summary

The Linux kernel's HID hyperv component does not properly validate initial device info bounds, allowing a malicious Hyper-V host or backend to crash a guest by sending a short initial device-info message with an oversized HID report descriptor length. This vulnerability can be exploited by a malicious Hyper-V host or backend to crash a guest, requiring verification and application of patches, review of Hyper-V configurations, and monitoring of guest systems. The vulnerability has been resolved in the Linux kernel, and users are advised to apply the patches to prevent potential crashes.

Defensive priority

Verify and apply patches for Linux kernel HID hyperv component

Recommended defensive actions

• Verify Linux kernel version and apply patches for HID hyperv component
• Review Hyper-V host and backend configurations for secure communication
• Monitor guest systems for potential crashes or instability
• Verify 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
• Check relevant monitoring, detection, and logs for exposed assets that need extra review

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but do not specify affected or fixed versions. Linux kernel maintainers have provided patches for the issue. The vulnerability has been resolved in the Linux kernel, and users are advised to apply the patches to prevent potential crashes. The patches are available on the Linux kernel website, and users should verify the authenticity of the patches before applying them. Additionally, users should review Hyper-V host and backend configurations for secure communication to

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.