CVE-2026-80763 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Bluetooth HCI event handling implementers, Linux system administrators, and security teams should verify Linux kernel versions and update if necessary, review and update Bluetooth HCI event handling implementations, and monitor for potential buffer overflow attempts. Affected operators and platforms should also take necessary actions to prevent potential buffer overflows.

Why it matters

A vulnerability in the Linux kernel's Bluetooth HCI event handling has been addressed, potentially allowing a malfunctioning controller to cause a buffer overflow. Linux kernel developers and maintainers, Bluetooth HCI event handling implementers, and Linux system administrators should verify Linux kernel versions and update if necessary, review and update Bluetooth HCI event handling implementations, and monitor for potential buffer overflow attempts.

• Verify Linux kernel versions and update if necessary to prevent potential buffer overflows
• Review and update Bluetooth HCI event handling implementations to ensure proper validation of LE Set CIG Parameters responses

Technical summary

The Linux kernel's Bluetooth HCI event handling did not properly validate LE Set CIG Parameters responses, potentially allowing a malfunctioning controller to cause a buffer overflow. This issue could lead to arbitrary code execution or denial of service. The vulnerability was addressed in the Linux kernel, and users should verify their kernel versions and update if necessary. Linux kernel developers and maintainers should review and update Bluetooth HCI event handling implementations to ensure proper validation of LE Set CIG Parameters responses.

Defensive priority

Verify Linux kernel versions and Bluetooth HCI event handling implementations to ensure proper validation of LE Set CIG Parameters responses.

Recommended defensive actions

• Verify Linux kernel versions and update if necessary
• Review Bluetooth HCI event handling implementations for proper validation
• Monitor for potential buffer overflow attempts
• 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 specific version information and exploitation details are not provided. The vulnerability was addressed in the Linux kernel, and users should verify their kernel versions and update if necessary. The CVE record and NVD entry also provide links to official advisories and source references for further information.

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.