---
title: "CVE-2026-80980: Linux Kernel - Race Condition"
description: "Linux kernel contains a race condition in net/smc due to shared single-byte bitfields for connection state flags, letting concurrent contexts cause inconsistent state, exploit requires concurrent access to connection flags."
url: https://panop.io/threat-heartbeat/CVE-2026-80980/
---

# CVE-2026-80980 Linux Kernel - Race Condition

Linux kernel contains a race condition in net/smc due to shared single-byte bitfields for connection state flags, letting concurrent contexts cause inconsistent state, exploit requires concurrent access to connection flags.

CVSS base score 9.8 /10

Critical

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.67% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-80980)

## Details

Type

Race Condition

Impact

Denial Of Service

CVSS vector

CVSS:3.1/AV:N/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 with fixed smc\_connection state flag handling.

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-2026-80980](https://nvd.nist.gov/vuln/detail/CVE-2026-80980)
- [https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec](https://git.kernel.org/stable/c/2cb7a8d64b7e8ccdc69bbe48fe9c4eaa79c33aec)
- [https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9](https://git.kernel.org/stable/c/313f79149eb337411c64e2c247234b62ef9a3cb9)
- [https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447](https://git.kernel.org/stable/c/db51a8658c11a82432b64999519a269c3aabb447)
- [https://git.kernel.org/stable/c/09a9cbadc05f452405de31012bd2c428b601291a](https://git.kernel.org/stable/c/09a9cbadc05f452405de31012bd2c428b601291a)

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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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