---
id: CVE-2026-98598
title: >-
  kernel: ipv6: Prevent rt6_insert_exception() for dying fib6_info
  (CVE-2026-98598)
summary: >-
  A flaw was found in the Linux kernel's IPv6 networking subsystem. A local
  attacker or network traffic triggering route exceptions while an IPv6 route is
  being removed can cause a circular reference leak. This failure to release
  resources p…
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-772
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T05:12:15+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98598.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98598.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98598'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554961'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98598'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98598'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98598.mbox
  - url: 'https://git.kernel.org/stable/c/649ffc76ed5483b2caf35ed90d3787538efc4e53'
  - url: 'https://git.kernel.org/stable/c/e03e77071e75ce726d877f0a4349a28b6e1f487a'
  - url: 'https://git.kernel.org/stable/c/0346ec2f080b40d95ed05b853bb9226289e75212'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00198
epssPercentile: 0.09465
ingestedAt: '2026-10-18T15:45:12.245Z'
---

## Overview

A flaw was found in the Linux kernel's IPv6 networking subsystem. A local attacker or network traffic triggering route exceptions while an IPv6 route is being removed can cause a circular reference leak. This failure to release resources prevents network devices from unregistering, resulting in stalled operations and a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 6, 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 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98598.json)

**kernel: ipv6: Prevent rt6_insert_exception() for dying fib6_info** — 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 9
- Red Hat OpenShift Container Platform 4

No fix planned:

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

Not affected:

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

## Remediation

Out of support scope