---
id: CVE-2026-97522
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mptcp: fix bad accounting in __mptcp_subflow_push_pending()

  If __subflow_push_pending() errors out we should avoid updating the
  copied byte counters, to avoid mismatch…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  mptcp: fix bad accounting in __mptcp_subflow_push_pending()

  If __subflow_push_pending() errors out we should avoid updating the
  copied byte counters, to avoid mismatch…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-252
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0fa1b3783a17d75a4aa1651a18ede041ffca5750 <
    ddbf9f03c1cc7d5b86eebe7c2beea0db4286d354
  - >-
    Linux >= 0fa1b3783a17d75a4aa1651a18ede041ffca5750 <
    9781fa35d9f7a87a83115acd3a88bc9ce35b5407
  - >-
    Linux >= 0fa1b3783a17d75a4aa1651a18ede041ffca5750 <
    a0a64525f3414268ed4b1945a1dc690aa974dd4f
  - >-
    Linux >= 0fa1b3783a17d75a4aa1651a18ede041ffca5750 <
    dc054821e639a2e14f1419436612db70b6af45fc
  - >-
    Linux >= 0fa1b3783a17d75a4aa1651a18ede041ffca5750 <
    f3ef03357396d4b147d8e76c75fb612c2f264ffc
  - Linux 6.6
published: '2026-09-25'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:18:01.053'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97522'
references:
  - url: 'https://git.kernel.org/stable/c/9781fa35d9f7a87a83115acd3a88bc9ce35b5407'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a0a64525f3414268ed4b1945a1dc690aa974dd4f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/dc054821e639a2e14f1419436612db70b6af45fc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ddbf9f03c1cc7d5b86eebe7c2beea0db4286d354'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f3ef03357396d4b147d8e76c75fb612c2f264ffc'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97522.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-97522'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2541176'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-97522'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-97522'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-97522.mbox
tags:
  - nvd
  - cve.org
  - csaf
  - vex
  - red-hat
epss: 0.00206
epssPercentile: 0.10472
cvssSource: vendor
ingestedAt: '2026-09-25T11:06:38.927Z'
---

## Overview

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

mptcp: fix bad accounting in __mptcp_subflow_push_pending()

If __subflow_push_pending() errors out we should avoid updating the
copied byte counters, to avoid mismatch push call later on.

## Remediation

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

## Vendor advisories

- **Red Hat VEX** · Low · 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 2026-10-17 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-97522.json)