---
id: CVE-2026-98570
title: >-
  kernel: net: ipv6: keep room for the mac header in dst_dev_overhead()
  (CVE-2026-98570)
summary: >-
  A flaw was found in the Linux kernel's IPv6 networking subsystem. An
  unauthenticated remote attacker can cause a Denial of Service (DoS) by sending
  network traffic through an affected IPv6 tunnel interface. Due to insufficient
  buffer alloc…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-787
vendor: Red Hat
product: Linux
affected:
  - >-
    Linux >= dce525185bc92864e5a318040285ee070563fe34 <
    36c07127924f11fc5741a780abcaaf808fe9ef13
  - >-
    Linux >= dce525185bc92864e5a318040285ee070563fe34 <
    87cd6b717e4069dca34e0866e57eaeb44d3b173e
  - Linux 8471e228448a818e4c27cab4b681b2e758e46cf5
  - Linux c432cd18a07b623651ed15ea167bd303467004cc
  - Linux 634710a372ba65bee667c2f6e58a97658c639eab
  - Linux c447c5a9c47bb4858ab12bf90879fe595d2b7f46
  - Linux ab9de9c48316d2622d3bf353916b99971570e2c9
  - Linux 2fcc9f3798ef82399564d247458e69abd10e683b
  - Linux 371d8dc298b4f59e99b4564ac5d906fce0932c69
  - Linux b26f015dfb07b6be12d005a0ed0c5c43b7bedbf3
  - Linux c0b11dc50590e10590b39dcda79835cd32f49d00
  - Linux 4c12c3c8abd8b888945d31e7bdbb0d8b73032fc5
  - Linux 25d8e065c7972dc98fd7a4cac322d5367eaede88
  - Linux 4a855c5aec41bf84922224ab7a74e088776e3ac4
  - Linux a9f0407414e16176fdbbbd298c9e18d6dfdf96bc
  - Linux >= 6.12.16 < 6.13
  - Linux >= 6.13.4 < 6.14
  - Linux >= 5.15.179 < 5.16
  - Linux >= 6.1.130 < 6.2
  - Linux >= 6.6.81 < 6.7
  - Linux >= 5.10.235 < 5.11
  - Linux 6.14
published: '2026-10-18'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T03:08:33+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98570.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98570.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98570'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554991'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98570'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98570'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98570.mbox
  - url: 'https://git.kernel.org/stable/c/36c07127924f11fc5741a780abcaaf808fe9ef13'
  - url: 'https://git.kernel.org/stable/c/87cd6b717e4069dca34e0866e57eaeb44d3b173e'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00189
epssPercentile: 0.08473
ingestedAt: '2026-10-18T15:45:12.258Z'
---

## Overview

A flaw was found in the Linux kernel's IPv6 networking subsystem. An unauthenticated remote attacker can cause a Denial of Service (DoS) by sending network traffic through an affected IPv6 tunnel interface. Due to insufficient buffer allocation when reconstructing packet headers, an unchecked negative offset triggers an out-of-bounds memory write. This vulnerability can lead to an immediate system crash and potential memory corruption.

## Vendor advisories

- **Red Hat VEX** · Moderate · updated 2026-10-20 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98570.json)

**kernel: net: ipv6: keep room for the mac header in dst_dev_overhead()** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.

Not 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

## Remediation

Refer to the advisory for fix availability.