---
id: CVE-2026-80681
title: >-
  In the Linux kernel, the following vulnerability has been resolved:


  vxlan: re-fetch eth header after route_shortcircuit()


  Before route_shortcircuit(), the eth header pointer is cached from
  eth_hdr(skb).


  Inside route_shortcircuit(), ps…
summary: >-
  In the Linux kernel, the following vulnerability has been resolved:


  vxlan: re-fetch eth header after route_shortcircuit()


  Before route_shortcircuit(), the eth header pointer is cached from
  eth_hdr(skb).


  Inside route_shortcircuit(), ps…
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'
published: '2026-08-28'
updated: '2026-08-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-80681'
references:
  - url: 'https://git.kernel.org/stable/c/1235e017aa11cf01e91b613c4c5ed6aa28934fff'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1395a676ec15a0a02a2a6d86602324f2d5fd41d5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1511631b7cfc4152b10a0a9d04c7a0bf2ddf4585'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/1b7f7b653e3557690047c62f03b80a24ea5a58a5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/2355c8c26d2aa1b4385b369e67202e47d460d555'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6375093eb45cd7d89f1945f939eeae3b29d79f56'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/bf045341dfb3e767f0ff94cf240ce3c371973bd4'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c9dceac9e1c7c772c43c732fc0d325e72835801a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00734
epssPercentile: 0.52366
ingestedAt: '2026-08-30T04:47:10.414Z'
---

## Overview

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

vxlan: re-fetch eth header after route_shortcircuit()

Before route_shortcircuit(), the eth header pointer is cached from eth_hdr(skb).

Inside route_shortcircuit(), pskb_may_pull() can be called, which may
reallocate skb->head.

In this case, returning to vxlan_xmit() leaves the cached eth pointer pointing to
freed memory, leading to a use-after-free when dereferencing eth->h_dest.

Fix this by updating eth = eth_hdr(skb) after calling route_shortcircuit().

## Remediation

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