---
id: CVE-2026-98829
title: >-
  kernel: wifi: mac80211: drop oversized fragments to avoid extra_len overflow
  (CVE-2026-98829)
summary: >-
  A flaw was found in the mac80211 wireless networking subsystem of the Linux
  kernel. An adjacent attacker, such as a rogue Wi-Fi access point or nearby
  malicious device, can cause a Denial of Service (DoS) by transmitting a
  sequence of over…
severity: medium
cvss: 6.5
cvssVector: 'CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-190
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: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T21:05:32+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98829.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98829.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98829'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555196'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98829'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98829'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98829.mbox
  - url: 'https://git.kernel.org/stable/c/9338b2dea74cb0fc80a4c958b68e687610ba2261'
  - url: 'https://git.kernel.org/stable/c/870b8cb9baa9bd859deceb33ae158011e6ba2360'
  - url: 'https://git.kernel.org/stable/c/5e4f3509793b4db2c0835340224743db680e861f'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00166
epssPercentile: 0.05773
ingestedAt: '2026-10-18T16:47:32.471Z'
---

## Overview

A flaw was found in the mac80211 wireless networking subsystem of the Linux kernel. An adjacent attacker, such as a rogue Wi-Fi access point or nearby malicious device, can cause a Denial of Service (DoS) by transmitting a sequence of oversized wireless frame fragments. This causes an integer overflow during frame reassembly, leading to an undersized buffer allocation and an immediate system crash.

## 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 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98829.json)

**kernel: wifi: mac80211: drop oversized fragments to avoid extra_len overflow** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

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