---
id: CVE-2026-98794
title: 'kernel: ipvs: filter some flags received in the backup server (CVE-2026-98794)'
summary: >-
  A flaw was found in the Linux kernel's IPVS (IP Virtual Server) subsystem. An
  attacker on the local network can send synchronization messages containing
  invalid connection flag combinations to an IPVS backup server. This lack of
  validation…
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-1288
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 6
  - enterprise_linux 7
  - enterprise_linux 8
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T15:23:11+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98794.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98794.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98794'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555159'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98794'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98794'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98794.mbox
  - url: 'https://git.kernel.org/stable/c/d7d33c9efa9d1a2f244a1a64ec9b540b0f8975a0'
  - url: 'https://git.kernel.org/stable/c/f4cd1db7d421e82945713a36084bb0c35b75b27e'
  - url: 'https://git.kernel.org/stable/c/55d033324f67a15ff56be6d38d6e87f644e0ed62'
  - url: 'https://git.kernel.org/stable/c/45a93111835ccfea7d969ec73588e33745fd9834'
  - url: 'https://git.kernel.org/stable/c/f96e91748f6304668fe647e686d199d7207d36f1'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.002
epssPercentile: 0.0973
ingestedAt: '2026-10-18T16:47:32.485Z'
---

## Overview

A flaw was found in the Linux kernel's IPVS (IP Virtual Server) subsystem. An attacker on the local network can send synchronization messages containing invalid connection flag combinations to an IPVS backup server. This lack of validation can disrupt connection tracking lookups and corrupt connection handling, leading to 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 7, 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 7, Red Hat Enterprise Linux 8, … · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98794.json)

**kernel: ipvs: filter some flags received in the backup server** — 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 7
- 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 7
- Red Hat Enterprise Linux 8
- Red Hat Enterprise Linux 9
- Red Hat OpenShift Container Platform 4

## Remediation

Out of support scope