---
id: CVE-2026-98793
title: 'kernel: netfilter: bpf: reject invalid NAT manipulation types (CVE-2026-98793)'
summary: >-
  A flaw was found in the Linux kernel's netfilter subsystem. Missing validation
  of Network Address Translation (NAT) manipulation types in BPF connection
  tracking helpers allows a local user with permissions to run BPF programs to
  trigger a…
severity: medium
cvss: 4.4
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H'
cvssSource: vendor
cwe: CWE-824
vendor: Red Hat
product: Red Hat Enterprise Linux 9
affected:
  - enterprise_linux 10
  - enterprise_linux 9
  - openshift_container_platform 4
published: '2026-10-18'
updated: '2026-10-23'
sourceUpdated: '2026-10-23T15:23:25+00:00'
source: CSAF
sourceUrl: 'https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98793.json'
references:
  - url: >-
      https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98793.json
  - url: 'https://access.redhat.com/security/cve/CVE-2026-98793'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2555143'
  - url: 'https://www.cve.org/CVERecord?id=CVE-2026-98793'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-98793'
  - url: >-
      https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98793.mbox
  - url: 'https://git.kernel.org/stable/c/752492947be3123ea6c689e2f93ae04ecd675d42'
  - url: 'https://git.kernel.org/stable/c/ea777dc90ab37e64fa4b92f6fcf3b5edcef5e058'
  - url: 'https://git.kernel.org/stable/c/f6143ae109df56d51d5536e813deb19eee7a6205'
  - url: 'https://git.kernel.org/stable/c/58108f05b0502448f6bb612ee2eccc63bd6449cb'
  - url: 'https://git.kernel.org/stable/c/16d464013ec2267b00a83f4bfbb97b3ecc63bfa7'
tags:
  - csaf
  - vex
  - red-hat
  - cve.org
epss: 0.00168
epssPercentile: 0.05991
ingestedAt: '2026-10-18T16:47:32.484Z'
---

## Overview

A flaw was found in the Linux kernel's netfilter subsystem. Missing validation of Network Address Translation (NAT) manipulation types in BPF connection tracking helpers allows a local user with permissions to run BPF programs to trigger a system crash. By supplying an invalid manipulation type, an attacker can cause the kernel to access uninitialized data structures or trigger a kernel panic, resulting in a Denial of Service (DoS).

## Vendor advisories

- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-10-23 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98793.json)

**kernel: netfilter: bpf: reject invalid NAT manipulation types** — rated Moderate by Red Hat. Released 2026-10-18, updated 2026-10-23.

Affected:

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

No fix planned:

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

## Remediation

Fix deferred