---
title: "CVE-2026-79982: Zephyr Bluetooth - Buffer Overflow"
description: "Zephyr Bluetooth HCI USB transport class contains a buffer overflow caused by copying oversized HCI packets into fixed-size USB transfer buffers without length checks, letting unauthenticated Bluetooth attackers cause memory corruption or denial of service, exploit requires attacker within Bluetooth range sending oversized HCI packets."
url: https://panop.io/threat-heartbeat/CVE-2026-79982/
---

# CVE-2026-79982 Zephyr Bluetooth - Buffer Overflow

Zephyr Bluetooth HCI USB transport class contains a buffer overflow caused by copying oversized HCI packets into fixed-size USB transfer buffers without length checks, letting unauthenticated Bluetooth attackers cause memory corruption or denial of service, exploit requires attacker within Bluetooth range sending oversized HCI packets.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.38% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-79982)

## Details

Type

Buffer Overflow

Impact

Remote Code Execution, Denial Of Service

CVSS vector

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Published

23 October 2026

Updated

25 October 2026

Weakness

[CWE-787](https://cwe.mitre.org/data/definitions/787.html)

## Vendor fix

Update to the latest Zephyr version with the bt\_hci\_tx\_pool fix that properly bounds USB transfer buffers.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

## References

- [https://nvd.nist.gov/vuln/detail/CVE-2026-79982](https://nvd.nist.gov/vuln/detail/CVE-2026-79982)
- [https://github.com/zephyrproject-rtos/zephyr/commit/0419defd2391652edc27689d206fcd9c48439d4a](https://github.com/zephyrproject-rtos/zephyr/commit/0419defd2391652edc27689d206fcd9c48439d4a)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w5px-w97v-c3hj](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-w5px-w97v-c3hj)

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## What this record can't tell you

- Whether you run the affected software, and where
- Whether an attacker can actually reach and exploit it
- The misconfigurations that never get a CVE number
- What it would cost the business, ranked into what to fix first

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