---
id: CVE-2026-98556
title: 'kernel: gve: DQO: reject TSO packets with an out of range MSS (CVE-2026-98556)'
summary: >-
  A flaw was found in the Linux kernel's Google Virtual NIC (gve) driver. A
  local user with raw packet access or an adjacent guest system can trigger a
  Denial of Service (DoS) by sending network packets with an excessively large
  segment size…
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-1284
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T02:12:18+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98556.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98556.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98556'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2554953'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98556'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98556'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98556.mbox
  - url: 'https://git.kernel.org/stable/c/2dc3ae3942e151fef254b7bbb65c832192ad2069'
  - url: 'https://git.kernel.org/stable/c/c517e8755960c8c6335ebf7dae6c95c43e5fb085'
  - url: 'https://git.kernel.org/stable/c/296c83b5ccc808c080865eb20fd7a477b0355bb7'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00198
epssPercentile: 0.09465
ingestedAt: '2026-10-18T15:45:12.263Z'
---

## Overview

A flaw was found in the Linux kernel's Google Virtual NIC (gve) driver. A local user with raw packet access or an adjacent guest system can trigger a Denial of Service (DoS) by sending network packets with an excessively large segment size. The driver fails to validate the Maximum Segment Size (MSS) before writing it to a hardware descriptor during TCP Segmentation Offload (TSO), causing the size value to wrap or truncate to zero. This misconfiguration can cause network packet processing failures and disrupt network connectivity.

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, 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-2026-98556.json)

**kernel: gve: DQO: reject TSO packets with an out of range MSS** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-20.

Affected:

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

No fix planned:

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

## Remediation

Fix deferred