---
id: CVE-2026-98568
title: >-
  kernel: vxlan: use one headroom snapshot for neighbour replies
  (CVE-2026-98568)
summary: >-
  A flaw was found in the Linux kernel's VXLAN (Virtual Extensible LAN)
  networking module. A race condition can occur when link properties are
  modified while neighbour advertisement reply packets are being processed,
  leading to inconsistent …
severity: medium
cvss: 4.7
cvssVector: 'CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - 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-2026-98568.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98568.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98568'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555006'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98568'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98568'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98568.mbox
  - url: 'https://git.kernel.org/stable/c/45a67662bf8ce3aa5643accf98d328dfbb47eaf6'
  - url: 'https://git.kernel.org/stable/c/315d42ca39f69846662961c25dcf2bb07c350d14'
  - url: 'https://git.kernel.org/stable/c/a3c5eb6e382dd426a5e7eb08608897ed57167ff7'
  - url: 'https://git.kernel.org/stable/c/ff022fd9d0f0282c575e11778b96bd1b637503eb'
  - url: 'https://git.kernel.org/stable/c/481506a756dcd828ef42391cb08f38d8d96d38fc'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.002
epssPercentile: 0.0977
ingestedAt: '2026-10-18T15:45:12.261Z'
---

## Overview

A flaw was found in the Linux kernel's VXLAN (Virtual Extensible LAN) networking module. A race condition can occur when link properties are modified while neighbour advertisement reply packets are being processed, leading to inconsistent buffer size calculations. A local attacker could exploit this timing issue to cause an out-of-bounds write to kernel memory, resulting in a Denial of Service (DoS) via a system crash or potential memory corruption.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98568.json)

**kernel: vxlan: use one headroom snapshot for neighbour replies** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.

Affected:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

No fix planned:

- Red Hat Enterprise Linux 10
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

Not affected:

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

## Remediation

Fix deferred