---
id: CVE-2026-98569
title: >-
  kernel: ip_gre: Reject enabling collect metadata through changelink
  (CVE-2026-98569)
summary: >-
  A flaw was found in the Linux kernel's Generic Routing Encapsulation (GRE)
  subsystem. A local user with network administration privileges could cause a
  Denial of Service (DoS) by enabling metadata collection on an existing GRE
  network devi…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-694
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T02:56:59+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98569.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98569.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98569'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554918'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98569'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98569'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98569.mbox
  - url: 'https://git.kernel.org/stable/c/c80315da84998b69b8829785a174b0bf72a81992'
  - url: 'https://git.kernel.org/stable/c/cff8b520312e750ad38967c30128e1534cbf9484'
  - url: 'https://git.kernel.org/stable/c/1dc759571f3df14891175fc52527f7624ba01322'
  - url: 'https://git.kernel.org/stable/c/da2e0cfbb620b199927a1e5b93b7cfde32083c7d'
  - url: 'https://git.kernel.org/stable/c/2e54d53b65e296b4b4bdc2cdd3b2b58dfa8d8c5c'
  - url: 'https://git.kernel.org/stable/c/bdd41b96e814300c66222cf4e47ecb8aef995656'
  - url: 'https://git.kernel.org/stable/c/63c5e48d6f7f5722a48f63e13e961dc5302894ed'
  - url: 'https://git.kernel.org/stable/c/a3f315be9d30eeb6938d11fa17fd4b32d52f7c42'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00216
epssPercentile: 0.11996
ingestedAt: '2026-10-18T15:45:12.258Z'
---

## Overview

A flaw was found in the Linux kernel's Generic Routing Encapsulation (GRE) subsystem. A local user with network administration privileges could cause a Denial of Service (DoS) by enabling metadata collection on an existing GRE network device through a netlink interface modification request. Because the kernel fails to verify tunnel uniqueness during link modifications, this operation can overwrite shared metadata lookup entries, breaking packet reception for other active tunnel devices in the same network namespace when either device is removed.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 6, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 7, Red Hat Enterprise Linux 8, … · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98569.json)

**kernel: ip_gre: Reject enabling collect metadata through changelink** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 6
- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope