CVE-2026-98732 Linux CVE debrief

Who should care

Linux kernel developers and maintainers, Bluetooth component developers, and system administrators responsible for Linux kernel updates and security patches. These individuals should assess exposure and prioritize patching to prevent potential information disclosure or system crashes.

Why it matters

A buffer over-read vulnerability in the Linux kernel's Bluetooth btintel component can lead to potential information disclosure or system crashes. Linux kernel developers and maintainers, Bluetooth component developers, and system administrators responsible for Linux kernel updates and security patches should assess exposure and prioritize patching.

• Verify kernel versions and patch levels to ensure vulnerability is addressed
• Monitor system logs for potential exploitation attempts
• Review system configurations to ensure Bluetooth component is properly secured

Technical summary

The btintel_hw_error() function in the Linux kernel's Bluetooth btintel component does not properly handle a 12-byte payload, which can lead to a buffer over-read when printing exception information. The function uses skb->data + 1, but the payload is not guaranteed to be NUL-terminated and can be read past its end. This vulnerability can result in potential information disclosure or system crashes. Linux kernel developers and maintainers should assess exposure and prioritize patching. The vulnerability was resolved in the Linux kernel.

Defensive priority

Medium

Recommended defensive actions

• Review and apply the patch for the Linux kernel Bluetooth btintel component
• Monitor system logs for potential exploitation attempts
• Verify system configurations and kernel versions
• Review compensating controls for exposed systems while remediation is scheduled and verified
• 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

Evidence notes

The vulnerability was resolved in the Linux kernel. The CVE record and NVD entry provide details on the vulnerability. Evidence of the vulnerability includes the Linux kernel's Bluetooth btintel component not properly handling a 12-byte payload, leading to a buffer over-read. Defenders should verify kernel versions and patch levels to ensure the vulnerability is addressed.

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.