---
title: "CVE-2026-97524: Linux Kernel mptcp - Denial of Service"
description: "Linux kernel mptcp contains a logic flaw in subflow reset handling causing recursive calls in mptcp receive path, letting attackers trigger unneeded processing and potential resource issues, exploit requires specific error conditions."
url: https://panop.io/threat-heartbeat/CVE-2026-97524/
---

# CVE-2026-97524 Linux Kernel mptcp - Denial of Service

Linux kernel mptcp contains a logic flaw in subflow reset handling causing recursive calls in mptcp receive path, letting attackers trigger unneeded processing and potential resource issues, exploit requires specific error conditions.

CVSS base score 7.5 /10

High

CISA KEV

Not listed

Public exploit

None known

Authentication

Not required

EPSS

0.69% chance of exploitation in 30 days

[View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-97524)

## Details

Type

Denial of Service

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 containing the fix for mptcp subflow reset 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-2026-97524](https://nvd.nist.gov/vuln/detail/CVE-2026-97524)
- [https://git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0](https://git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0)
- [https://git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f](https://git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f)
- [https://git.kernel.org/stable/c/1962841387087970d75ba8b8d4c2aa2d45705e50](https://git.kernel.org/stable/c/1962841387087970d75ba8b8d4c2aa2d45705e50)
- [https://git.kernel.org/stable/c/6d669c740933124eae3df8cfc15995af9bcc6aba](https://git.kernel.org/stable/c/6d669c740933124eae3df8cfc15995af9bcc6aba)
- [https://git.kernel.org/stable/c/83a7dcdd2b1060484528da70a643125174d47e5a](https://git.kernel.org/stable/c/83a7dcdd2b1060484528da70a643125174d47e5a)
- [https://git.kernel.org/stable/c/a370e56024df0b07e3120c45a9773ae123819fd6](https://git.kernel.org/stable/c/a370e56024df0b07e3120c45a9773ae123819fd6)
- [https://git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c](https://git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c)
- [https://git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307](https://git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307)

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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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