CVE-2026-80186: Buffer Copy without Checking Size of Input ('Classic Buffer Overflow') in Red Hat Red Hat Enterprise Linux 10

This vulnerability exists in BlueZ, the Linux Bluetooth protocol stack, specifically in the handling of Extended Inquiry Response (EIR) packets during Bluetooth discovery. A remote attacker within Bluetooth radio range can send a crafted EIR packet that causes a stack-based buffer overflow. The overflow can lead to crashing the bluetoothd service (DoS) and potentially enable arbitrary code execution. The CVSS v3.1 base score is 7.6 (high severity) with attack vector being adjacent network, low attack complexity, no privileges or user interaction required, and impacts on confidentiality, integrity, and availability. Red Hat's advisory confirms the vulnerability affects Red Hat Enterprise Linux 10 but does not yet provide a remediation level or patch. The vulnerability is tracked as CWE-120 (classic buffer overflow).

Successful exploitation can cause a Denial of Service by crashing the bluetoothd service and may allow an attacker to execute arbitrary code on the affected system. This impacts system availability and potentially confidentiality and integrity due to unauthorized code execution.

Patch status is not yet confirmed — check the vendor advisory at https://access.redhat.com/security/cve/CVE-2026-80186 for current remediation guidance. No official fix or temporary mitigation is currently stated by Red Hat. Monitor the advisory for updates and apply patches once available.