CVE-2026-80692 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Bluetooth protocol implementers, and organizations relying on Linux kernel-based systems with Bluetooth functionality should be aware of this theoretical vulnerability and take steps to verify their configurations and apply patches as necessary. This includes reviewing the Linux kernel patch history, verifying Bluetooth hci_sync configurations, and considering compensating controls for Linux kernel Bluetooth functionality.

Technical summary

The Linux kernel's Bluetooth hci_sync functionality has a theoretical use-after-free vulnerability. The issue arises if the connection is freed while the hci_sync task is running. To mitigate this, holding a reference count on the connection can prevent the use-after-free condition. Further analysis of Linux kernel patch history and Bluetooth hci_sync implementation details may be necessary to fully understand the vulnerability. The vulnerability has been resolved in the Linux kernel.

Defensive priority

Medium

Recommended defensive actions

• Verify Linux kernel version and Bluetooth hci_sync configuration
• Review Linux kernel patch history for related fixes
• Consider compensating controls for Linux kernel Bluetooth functionality
• 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
• Track exceptions, retest remediated assets, and close the item only after evidence is documented

Evidence notes

The CVE record indicates a theoretical use-after-free vulnerability in the Linux kernel's Bluetooth hci_sync functionality. Holding a reference count on the connection can prevent this issue. Evidence is limited; further review of Linux kernel patch history and Bluetooth hci_sync implementation details is recommended. The vulnerability has been resolved in the Linux kernel. However, organizations relying on Linux kernel-based systems with Bluetooth functionality should verify their configurations and apply patches as necessary. Limited evidence is available, and defenders should verify the configurations and apply patches as necessary.

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.