---
title: "CVE-2026-80989: Linux kernel net thunderbolt - Denial of Service"
description: "Linux kernel net thunderbolt contains a logic flaw in tbnet_connected_work() where connection state is not properly cleared on failure, causing repeated teardown and resource mismanagement, letting attackers cause system warnings or crashes, exploit requires network interaction."
url: https://panop.io/threat-heartbeat/CVE-2026-80989/
---

# CVE-2026-80989 Linux kernel net thunderbolt - Denial of Service

Linux kernel net thunderbolt contains a logic flaw in tbnet\_connected\_work() where connection state is not properly cleared on failure, causing repeated teardown and resource mismanagement, letting attackers cause system warnings or crashes, exploit requires network interaction.

CVSS base score 8.8 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.34% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80989)

## Details

Type

Denial of Service

Impact

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

11 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version containing the fix.

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-2026-80989](https://nvd.nist.gov/vuln/detail/CVE-2026-80989)
- [https://git.kernel.org/stable/c/3c8b26ebf525ba5960510f48c6e9936a79ebe76f](https://git.kernel.org/stable/c/3c8b26ebf525ba5960510f48c6e9936a79ebe76f)
- [https://git.kernel.org/stable/c/d6c0af293129345a17dc31c9b4179dc7f3d6af7a](https://git.kernel.org/stable/c/d6c0af293129345a17dc31c9b4179dc7f3d6af7a)
- [https://git.kernel.org/stable/c/ed1d6e3d735e7b03f43a02f4306c89eb7663da14](https://git.kernel.org/stable/c/ed1d6e3d735e7b03f43a02f4306c89eb7663da14)
- [https://git.kernel.org/stable/c/f01e6a35c440b62f060e21f36b385e574a7f308c](https://git.kernel.org/stable/c/f01e6a35c440b62f060e21f36b385e574a7f308c)
- [https://git.kernel.org/stable/c/e0d4a17afde5aa0045dc3e1d66c6bb80927bad8c](https://git.kernel.org/stable/c/e0d4a17afde5aa0045dc3e1d66c6bb80927bad8c)

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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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