CVE-2026-80760 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Bluetooth protocol implementers, and system administrators responsible for Linux kernel updates and security patches. These individuals should review and apply kernel updates to ensure the latest security patches are installed, monitor Bluetooth communication for potential anomalies, and verify system configurations and validate HCI_CMD_SYNC command handling.

Why it matters

A vulnerability in the Linux kernel's Bluetooth MGMT implementation could allow an attacker to send malformed HCI_CMD_SYNC commands, potentially causing issues with Bluetooth communication. Defenders should verify HCI_CMD_SYNC command handling, monitor Bluetooth communication, and validate kernel updates and security patches.

• Verify HCI_CMD_SYNC command handling and buffer overflow protection
• Monitor Bluetooth communication for potential anomalies
• Validate kernel updates and security patches

Technical summary

The Linux kernel's Bluetooth MGMT implementation does not properly validate the params_len field in HCI_CMD_SYNC commands, allowing for potential buffer overflow attacks. This vulnerability affects Linux kernel developers and maintainers, Bluetooth protocol implementers, and system administrators responsible for Linux kernel updates and security patches. The vulnerability arises from the lack of proper validation of the params_len field in HCI_CMD_SYNC commands, which could lead to buffer overflow attacks. Defenders should verify HCI_CMD_SYNC command handling, monitor Bluetooth communication, and validate kernel updates and security patches.

Defensive priority

Medium

Recommended defensive actions

• Review and apply kernel updates to ensure the latest security patches are installed
• Monitor Bluetooth communication for potential anomalies
• Verify system configurations and validate HCI_CMD_SYNC command handling
• 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
• Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but the scope of affected systems and potential impact require further verification. The vulnerability is caused by the Linux kernel's Bluetooth MGMT implementation not properly validating the params_len field in HCI_CMD_SYNC commands. This could allow an attacker to send malformed HCI_CMD_SYNC commands, potentially causing issues with Bluetooth communication. Defenders should verify HCI_CMD_SYNC command handling, monitor Bluetooth communication, and validate kernel.

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.