---
id: CVE-2026-74705
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  udp: fix potential use-after-free in tunnel segmentation

  __skb_udp_tunnel_segment() gets the UDP header before ensuring the
  tunnel header is in the skb head
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  udp: fix potential use-after-free in tunnel segmentation

  __skb_udp_tunnel_segment() gets the UDP header before ensuring the
  tunnel header is in the skb head. If the pu…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H'
published: '2026-08-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74705'
references:
  - url: 'https://git.kernel.org/stable/c/19d89b13a43640b2da2f277ee462d919d988cb6f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1ae134c012e10384cdac420b5cc6e0615cde0b55'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/5161e67c561c4f28a5d9335a6e859b02511de92b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/588d4a6795d99d080f74ef0b5f391ea8c453ae5d'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/64d322c288577793eedd352b96ef75234ed380fe'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6a733a38b983d8c2e222f13968209010cf44de87'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b3df61bb745eb5201eac22679a2839d4ccbf3442'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/d0f86fb36eb260abd10007b62c9dcc1028e03e61'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.005
epssPercentile: 0.41132
ingestedAt: '2026-10-14T13:30:58.543Z'
---

## Overview

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

udp: fix potential use-after-free in tunnel segmentation

__skb_udp_tunnel_segment() gets the UDP header before ensuring the
tunnel header is in the skb head. If the pull reallocates skb->head,
the saved UDP header pointer is no longer valid.

Get the UDP header after the pull to avoid a potential use-after-free.

## Remediation

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