---
title: "CVE-2026-19935: Zephyr Bluetooth LE - Use After Free"
description: "Zephyr Bluetooth LE host contains a use-after-free caused by improper cancellation of deferred L2CAP channel RX work in l2cap_chan_destroy(), letting remote unauthenticated peers with established CoC channels cause memory corruption or denial of service, exploit requires an established CoC channel."
url: https://panop.io/threat-heartbeat/CVE-2026-19935/
---

# CVE-2026-19935 Zephyr Bluetooth LE - Use After Free

Zephyr Bluetooth LE host contains a use-after-free caused by improper cancellation of deferred L2CAP channel RX work in l2cap\_chan\_destroy(), letting remote unauthenticated peers with established CoC channels cause memory corruption or denial of service, exploit requires an established CoC channel.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.18% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-19935)

## Details

Type

Use After Free

Impact

Denial Of Service

CVSS vector

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

Published

11 October 2026

Updated

15 October 2026

Weakness

[CWE-416](https://cwe.mitre.org/data/definitions/416.html)

## Vendor fix

Update to the latest Zephyr version with the fix for proper cancellation of L2CAP RX work in l2cap\_chan\_destroy().

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-2026-19935](https://nvd.nist.gov/vuln/detail/CVE-2026-19935)
- [https://github.com/zephyrproject-rtos/zephyr/commit/22896cb8d6f23feffe4b637119fb3e974ac3bed8](https://github.com/zephyrproject-rtos/zephyr/commit/22896cb8d6f23feffe4b637119fb3e974ac3bed8)
- [https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6gp4-cwf7-2vp8](https://github.com/zephyrproject-rtos/zephyr/security/advisories/GHSA-6gp4-cwf7-2vp8)

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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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