---
id: CVE-2026-97524
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mptcp: avoid unneeded actions on subflow reset

  Once in a blue moon, the mptcp receive path can recursively call
  mptcp_data_ready() via state change under unlucky error…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mptcp: avoid unneeded actions on subflow reset

  Once in a blue moon, the mptcp receive path can recursively call
  mptcp_data_ready() via state change under unlucky error…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-764
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= fde99e972b8f88cebe619241d7aa43d288ef666a <
    6d669c740933124eae3df8cfc15995af9bcc6aba
  - >-
    Linux >= 12c1676d598e3b8dd92a033b623b792cc2ea1ec5 <
    83a7dcdd2b1060484528da70a643125174d47e5a
  - >-
    Linux >= 35668f8ec84f6c944676e48ecc6bbc5fc8e6fe25 <
    a370e56024df0b07e3120c45a9773ae123819fd6
  - >-
    Linux >= b8be15d1ae7ea4eedd547c3b3141f592fbddcd30 <
    1962841387087970d75ba8b8d4c2aa2d45705e50
  - >-
    Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 <
    4b7abdcb5ba832fafab679f0d998af39cbc99307
  - >-
    Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 <
    b2dbcc1ed48b5ac070a41db4a52aade6823c4df0
  - >-
    Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 <
    ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f
  - >-
    Linux >= e32d262c89e2b22cb0640223f953b548617ed8a6 <
    2b0f561f21b27c40c91ea4975268a06092bd7e9c
  - Linux 8bfd391bde685df7289b928ce8876a3583be4bfb
  - Linux >= 5.10.228 < 5.10.271
  - Linux >= 5.15.169 < 5.15.222
  - Linux >= 6.1.113 < 6.1.189
  - Linux >= 6.6.57 < 6.6.158
  - Linux >= 6.11.4 < 6.12
  - Linux 6.12
published: '2026-09-25'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:18:01.307'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97524'
references:
  - url: 'https://git.kernel.org/stable/c/1962841387087970d75ba8b8d4c2aa2d45705e50'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2b0f561f21b27c40c91ea4975268a06092bd7e9c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4b7abdcb5ba832fafab679f0d998af39cbc99307'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6d669c740933124eae3df8cfc15995af9bcc6aba'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/83a7dcdd2b1060484528da70a643125174d47e5a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a370e56024df0b07e3120c45a9773ae123819fd6'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b2dbcc1ed48b5ac070a41db4a52aade6823c4df0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ce7e4ede01ed3e47a48c0f1ce1d87bf4864bee9f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97524.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97524'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541186'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97524'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97524'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97524.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00725
epssPercentile: 0.53883
scores:
  nvd: 7.5
  vendor: 7
  cna: 7.5
ingestedAt: '2026-09-25T11:06:38.927Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

mptcp: avoid unneeded actions on subflow reset

Once in a blue moon, the mptcp receive path can recursively call
mptcp_data_ready() via state change under unlucky error conditions, and
then try to hold the data lock again.

Break the recursion loop explicitly checking for the exceptional
condition.

Add a new flag instead of using an existing one like 'closing', to exit
early in subflow_state_change(), and explicitly flush the RX queue at
reset time.

This avoids unneeded processing to check for available data -- calling
get_mapping_status() and more on a dying subflow -- but also in error
reporting and worker scheduling.

Note that we must consume the currently peeked skb before invoking
mptcp_dss_corruption to avoid consuming it again after the eventual
reset has freed it.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-28 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97524.json)