---
id: CVE-2026-68161
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sctp: close UDP tunnel sockets during netns teardown

  proc_sctp_do_udp_port() starts per-net SCTP UDP tunneling sockets when
  net.sctp.udp_port is set, and stops/restart…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  sctp: close UDP tunnel sockets during netns teardown

  proc_sctp_do_udp_port() starts per-net SCTP UDP tunneling sockets when
  net.sctp.udp_port is set, and stops/restart…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 046c052b475e7119b6a30e3483e2888fc606a2f8 <
    c29affd44e6769e3073235d4b471d9b501fa8166
  - >-
    Linux >= 046c052b475e7119b6a30e3483e2888fc606a2f8 <
    c6eb2d615210b80339548ab07c0230edaab9a6c7
  - >-
    Linux >= 046c052b475e7119b6a30e3483e2888fc606a2f8 <
    8ff78591d309c50a4fdab683b68dd8d512a270dd
  - >-
    Linux >= 046c052b475e7119b6a30e3483e2888fc606a2f8 <
    3bf0e349cbb4f975f35eb22753acc346b89c66a0
  - >-
    Linux >= 046c052b475e7119b6a30e3483e2888fc606a2f8 <
    37ff9794be48d0caa37687e04d09675f9c849121
  - >-
    Linux >= 046c052b475e7119b6a30e3483e2888fc606a2f8 <
    ffb2bd7ade36ec4da32c46a6eddbf4515316d08c
  - Linux 5.11
published: '2026-08-10'
updated: '2026-10-03'
sourceUpdated: '2026-10-03T11:17:35.977'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-68161'
references:
  - url: 'https://git.kernel.org/stable/c/37ff9794be48d0caa37687e04d09675f9c849121'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/3bf0e349cbb4f975f35eb22753acc346b89c66a0'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8ff78591d309c50a4fdab683b68dd8d512a270dd'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c29affd44e6769e3073235d4b471d9b501fa8166'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c6eb2d615210b80339548ab07c0230edaab9a6c7'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ffb2bd7ade36ec4da32c46a6eddbf4515316d08c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
  - cve.org
epss: 0.00671
epssPercentile: 0.50268
ingestedAt: '2026-10-03T11:43:42.116Z'
---

## Overview

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

sctp: close UDP tunnel sockets during netns teardown

proc_sctp_do_udp_port() starts per-net SCTP UDP tunneling sockets when
net.sctp.udp_port is set, and stops/restarts them when the sysctl value
changes. The netns exit path does not stop these sockets, so a namespace
can be torn down while its SCTP UDP tunnel sockets are still installed.

Close the UDP tunnel sockets from sctp_ctrlsock_exit() after unregistering
the per-net sysctl table. This prevents new sysctl writes from racing in
while the sockets are being released, and closes the sockets before the
control socket is destroyed.

## Remediation

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