CVE-2026-80759 Linux CVE debrief

Who should care

Linux kernel maintainers and users, Bluetooth firmware developers, and security teams responsible for Linux kernel patching and vulnerability management. Additionally, operators and administrators of systems using the Linux kernel's Bluetooth hci_aml module should be aware of this vulnerability and take steps to ensure their systems are up to date.

Why it matters

A vulnerability in the Linux kernel's Bluetooth hci_aml module allows for potential out-of-bounds reads when handling truncated or inconsistent firmware images. This could lead to issues with constructing TCI commands. The issue has been resolved by adding validation for firmware segment lengths.

• Verify firmware validation mechanisms are in place for Linux kernel Bluetooth hci_aml module.
• Ensure Linux kernel is up to date with the latest security patches.
• Monitor system logs for potential issues related to Bluetooth firmware handling.

Technical summary

The Linux kernel's Bluetooth hci_aml module did not properly validate firmware segment lengths, allowing for potential out-of-bounds reads. This issue has been resolved by adding validation for firmware segment lengths. The vulnerability was addressed by adding validation for firmware segment lengths, which helps prevent out-of-bounds reads. This change ensures that the driver can handle firmware images correctly, reducing the risk of potential issues. The fix involves validating the lengths of firmware segments before processing them, which helps prevent out-of-bounds reads.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the provided kernel patches to ensure firmware segment lengths are validated.
• Verify that the Linux kernel is up to date with the latest security patches.
• Monitor system logs for potential issues related to Bluetooth firmware 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. However, specific exploitation details and affected versions are not provided in the source corpus. The Linux kernel's Bluetooth hci_aml module did not properly validate firmware segment lengths, allowing for potential out-of-bounds reads. The issue has been resolved by adding validation for firmware segment lengths. The vulnerability was addressed by adding validation for firmware segment lengths, which helps prevent out-of-bounds reads.

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.