---
id: CVE-2026-74669
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipvs: clear IPv4 options after rebasing tunnel ICMP errors

  ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the
  quoted original request before passing it t…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  ipvs: clear IPv4 options after rebasing tunnel ICMP errors

  ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the
  quoted original request before passing it t…
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: '2026-08-22'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T13:10:00.187'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-74669'
references:
  - url: 'https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
tags:
  - nvd
epss: 0.00514
epssPercentile: 0.42187
ingestedAt: '2026-10-14T13:30:58.532Z'
---

## Overview

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

ipvs: clear IPv4 options after rebasing tunnel ICMP errors

ip_vs_in_icmp() rebases an skb from the outer ICMP packet to the
quoted original request before passing it to icmp_send(). However,
IPCB(skb)->opt still describes the outer IPv4 header.

A timestamp option in the outer header can therefore leave an offset
that points into the quoted transport header after the rebase.
__ip_options_echo() treats a byte at that stale location as the option
length and copies it into the fixed-size option storage on the
__icmp_send() stack, causing a stack out-of-bounds write.

Clear the stale option metadata after resetting the network header.
Keep the remaining control block fields, including the ingress
interface used by the ICMP response path.

## Remediation

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