---
title: "CVE-2026-97523: Linux Kernel - Race Condition"
description: "Linux kernel contains a race condition in mptcp scheduler caused by concurrent state changes in subflow sockets, letting attackers cause data transmission failures and potential divide-by-zero errors, exploit requires triggering race condition."
url: https://panop.io/threat-heartbeat/CVE-2026-97523/
---

# CVE-2026-97523 Linux Kernel - Race Condition

Linux kernel contains a race condition in mptcp scheduler caused by concurrent state changes in subflow sockets, letting attackers cause data transmission failures and potential divide-by-zero errors, exploit requires triggering race condition.

CVSS base score 7.5 /10

High

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-2026-97523)

## Details

Type

Race Condition

Impact

Denial Of Service

CVSS vector

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

Published

25 September 2026

Updated

15 October 2026

## Vendor fix

Update to the latest Linux kernel version with the fix applied.

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-2026-97523](https://nvd.nist.gov/vuln/detail/CVE-2026-97523)
- [https://git.kernel.org/stable/c/a09c87abf10a0a7e203137c75b5381aa63d9b31d](https://git.kernel.org/stable/c/a09c87abf10a0a7e203137c75b5381aa63d9b31d)
- [https://git.kernel.org/stable/c/0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0](https://git.kernel.org/stable/c/0a926b5df8efdfbac07e2fb7fafb21849a2ad9c0)
- [https://git.kernel.org/stable/c/5883ae880f51edc4b1484e787473b865b6159ead](https://git.kernel.org/stable/c/5883ae880f51edc4b1484e787473b865b6159ead)
- [https://git.kernel.org/stable/c/d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03](https://git.kernel.org/stable/c/d74b2e26b54a7dae1d87c1f19ae0d6db500e5e03)
- [https://git.kernel.org/stable/c/42064de57fb83231fcc89663a94885f228a1ee53](https://git.kernel.org/stable/c/42064de57fb83231fcc89663a94885f228a1ee53)
- [https://git.kernel.org/stable/c/4c856f3c151a2f3fa237caa651c44015916ca584](https://git.kernel.org/stable/c/4c856f3c151a2f3fa237caa651c44015916ca584)
- [https://git.kernel.org/stable/c/8f11430d51ff8365bc51b670bc3002b65ae4c6b7](https://git.kernel.org/stable/c/8f11430d51ff8365bc51b670bc3002b65ae4c6b7)

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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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