# CVE-2026-80186: BlueZ stack-based buffer overflow in EIR handling

Source: https://junglewise.ai/threats/cve-2026-80186-bluez-stack-based-buffer-overflow-in-eir-handling  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-08-25. Updated: 2026-09-25  
License: CC BY 4.0 with a link back

CVE-2026-80186 · Severity: high · CVSS 7.6 · Published 2026-08-25

BlueZ is the standard Bluetooth protocol stack on Linux systems, handling wireless device discovery and pairing. A remote attacker within Bluetooth range can crash the bluetoothd service by sending a malformed discovery packet, causing temporary unavailability of Bluetooth connectivity. The vulnerability may also allow arbitrary code execution with the privileges of the bluetoothd service.

Technologies: [BlueZ](https://junglewise.ai/threats/technologies/bluez). Vendors: [BlueZ](https://junglewise.ai/threats/vendors/bluez).

## Quick answers

**Is CVE-2026-80186 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-80186 being exploited in the wild.

**How severe is CVE-2026-80186?** High severity, with a CVSS score of 7.6, published 25 August 2026.

**Which products and versions are affected?** BlueZ <UNKNOWN>.

**Is there a fix for CVE-2026-80186?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-80186 attacked?** It is attacked from the adjacent network.

**Am I affected by CVE-2026-80186?** Check whether you run BlueZ at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

A stack-based buffer overflow exists in BlueZ's Extended Inquiry Response (EIR) packet handling, specifically in the name2utf8 function. The vulnerability is triggered when a remote user within Bluetooth radio range sends a specially crafted EIR packet during device discovery, causing a buffer overflow on the target device. Attack requires no authentication or user interaction. An attacker can achieve Denial of Service by crashing the bluetoothd service and potentially arbitrary code execution with service-level privileges. Patches are available from the BlueZ project; Red Hat's CVSS assessment is 7.6 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H).

## Affected products

- BlueZ BlueZ <UNKNOWN>

## Timeline

- 2026-08-25: disclosed

## References

- [https://access.redhat.com/downloads/content/package-browser/](https://access.redhat.com/downloads/content/package-browser/)
- [https://access.redhat.com/security/cve/CVE-2026-80186](https://access.redhat.com/security/cve/CVE-2026-80186)

## Related threats

- [BlueZ A2DP stack-based buffer overflow](https://junglewise.ai/threats/cve-2026-19774-bluez-a2dp-stack-based-buffer-overflow)
- [BlueZ sdp-xml.c type confusion in RegisterProfile](https://junglewise.ai/threats/cve-2026-80185-bluez-sdp-xml-c-type-confusion-in-registerprofile)