---
id: CVE-2026-89565
title: >-
  kernel: ipip: fix skb leak in collect_md mode when metadata_dst allocation
  fails (CVE-2026-89565)
summary: >-
  A flaw was found in the Linux kernel's IP over IP (ipip) tunnel driver. When
  operating in collect_md mode, the ipip_tunnel_rcv() function fails to free a
  network packet buffer (skb) if the metadata_dst allocation fails. This
  oversight lead…
severity: medium
cvss: 5.5
cvssVector: 'CVSS:3.1/AV:L/AC:L/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 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-09-11'
updated: '2026-09-18'
sourceUpdated: '2026-09-18T22:06:54+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89565.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89565.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-89565'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2532185'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-89565'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-89565'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-89565.mbox
  - url: 'https://git.kernel.org/stable/c/31e4be21dacee49395013caae28576484a049a4f'
  - url: 'https://git.kernel.org/stable/c/6776efe4a52f289a3fc18f8adf19b035a7d8e1bb'
  - url: 'https://git.kernel.org/stable/c/6d8c5b266d0035a061573843a7243be068eb6118'
  - url: 'https://git.kernel.org/stable/c/fd01f1a3ed4a189a784654f7c69eb565872f2e12'
  - url: 'https://git.kernel.org/stable/c/1909df2d066424767429e13053eb9701263430ef'
  - url: 'https://git.kernel.org/stable/c/c4dc23de4cc75e4e304170b31bb8aeeacd5cb990'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00173
epssPercentile: 0.05846
ingestedAt: '2026-09-14T15:23:07.451Z'
---

## Overview

A flaw was found in the Linux kernel's IP over IP (ipip) tunnel driver. When operating in collect_md mode, the ipip_tunnel_rcv() function fails to free a network packet buffer (skb) if the metadata_dst allocation fails. This oversight leads to a memory leak. A local attacker could potentially exploit this vulnerability to exhaust system memory, resulting in 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 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 8, Red Hat Enterprise Linux 9, … · updated 2026-09-18 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89565.json)

**kernel: ipip: fix skb leak in collect_md mode when metadata_dst allocation fails** — rated Moderate by Red Hat. Released 2026-09-11, updated 2026-09-18.

Affected:

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

Not affected:

- Red Hat Enterprise Linux 7

## Remediation

Out of support scope