---
id: CVE-2026-74473
title: 'vxlan: use pskb_network_may_pull() in route_shortcircuit()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  vxlan: use pskb_network_may_pull() in route_shortcircuit()

  route_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr))
  (or ipv6hdr), which checks if …
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'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    c419af4924c1593500a40519730ed98575d04a3e
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    6bd0a3a1b5744166946f0c551a6665c3b46b05e4
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    214ba43faf106cb06cd3dd30999c5c809c868b53
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    42887be7c4cf283cce02cd0fb6411221167c8b6c
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    aa0d31376d574ac858a40078431a77127bf04ee4
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    ee799977d7941dbfb11049e17edd9eaf4f8820f7
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    4f3f96e771a20263635bb5e1307c112d613b4bbd
  - >-
    Linux >= e4f67addf158f98f8197e08974966b18480dc751 <
    26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb
  - Linux 3.8
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-10-16T18:57:24.199754Z'
published: '2026-08-15'
updated: '2026-10-16'
sourceUpdated: '2026-10-16T19:05:47.966Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-74473'
references:
  - url: 'https://git.kernel.org/stable/c/c419af4924c1593500a40519730ed98575d04a3e'
  - url: 'https://git.kernel.org/stable/c/6bd0a3a1b5744166946f0c551a6665c3b46b05e4'
  - url: 'https://git.kernel.org/stable/c/214ba43faf106cb06cd3dd30999c5c809c868b53'
  - url: 'https://git.kernel.org/stable/c/42887be7c4cf283cce02cd0fb6411221167c8b6c'
  - url: 'https://git.kernel.org/stable/c/aa0d31376d574ac858a40078431a77127bf04ee4'
  - url: 'https://git.kernel.org/stable/c/ee799977d7941dbfb11049e17edd9eaf4f8820f7'
  - url: 'https://git.kernel.org/stable/c/4f3f96e771a20263635bb5e1307c112d613b4bbd'
  - url: 'https://git.kernel.org/stable/c/26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb'
tags:
  - cve.org
epss: 0.00525
epssPercentile: 0.43245
ingestedAt: '2026-10-16T19:46:24.358Z'
---

## Overview

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

vxlan: use pskb_network_may_pull() in route_shortcircuit()

route_shortcircuit() currently calls pskb_may_pull(skb, sizeof(struct iphdr))
(or ipv6hdr), which checks if bytes are available starting from skb->data.

However, in vxlan_xmit(), skb->data points to the MAC header, so
skb_network_offset(skb) is ETH_HLEN (14 bytes). Using pskb_may_pull(skb, 20)
only checks 20 bytes from skb->data (which is 14 bytes MAC header + 6 bytes of
IP header), leaving the rest of the IP header potentially un-pulled in non-linear
frags. Subsequent dereferences of ip_hdr(skb)->daddr can read beyond the pulled
linear buffer length.

Fix this by using pskb_network_may_pull(), which adds skb_network_offset(skb) to
the length check to ensure the full network header is present in the linear buffer.

## Affected

- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < c419af4924c1593500a40519730ed98575d04a3e`
- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < 6bd0a3a1b5744166946f0c551a6665c3b46b05e4`
- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < 214ba43faf106cb06cd3dd30999c5c809c868b53`
- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < 42887be7c4cf283cce02cd0fb6411221167c8b6c`
- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < aa0d31376d574ac858a40078431a77127bf04ee4`
- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < ee799977d7941dbfb11049e17edd9eaf4f8820f7`
- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < 4f3f96e771a20263635bb5e1307c112d613b4bbd`
- `Linux >= e4f67addf158f98f8197e08974966b18480dc751 < 26bb2dd0a8839617e2c79ffbbe1923f8e4bab9fb`
- `Linux 3.8`

## Remediation

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