---
id: CVE-2026-98793
title: 'netfilter: bpf: reject invalid NAT manipulation types'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: bpf: reject invalid NAT manipulation types

  As bpf_ct_set_nat_info() is not validating the NAT manipulation type a
  wrong value can be passed directly to nf_n…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 <
    ea777dc90ab37e64fa4b92f6fcf3b5edcef5e058
  - >-
    Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 <
    f6143ae109df56d51d5536e813deb19eee7a6205
  - >-
    Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 <
    58108f05b0502448f6bb612ee2eccc63bd6449cb
  - >-
    Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 <
    16d464013ec2267b00a83f4bfbb97b3ecc63bfa7
  - Linux 6.1
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:48:33.555Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98793'
references:
  - 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:
  - cve.org
ingestedAt: '2026-10-18T16:47:32.484Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

netfilter: bpf: reject invalid NAT manipulation types

As bpf_ct_set_nat_info() is not validating the NAT manipulation type a
wrong value can be passed directly to nf_nat_setup_info(). This triggers
the WARN_ON() at nf_nat_setup_info() and if panic_on_warn isn't set,
then IPS_SRC_NAT_DONE is set without adding nat_bysource and conntrack
cleanup tries to unlink an uninitialized hlist node.

Fix this by checking that NAT manipulation type is correct before
calling nf_nat_setup_info(). In addition, if the WARN_ON is hit, return
NF_DROP instead of continuing with the processing to avoid similar
situations in the future.

## Affected

- `Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 < ea777dc90ab37e64fa4b92f6fcf3b5edcef5e058`
- `Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 < f6143ae109df56d51d5536e813deb19eee7a6205`
- `Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 < 58108f05b0502448f6bb612ee2eccc63bd6449cb`
- `Linux >= 0fabd2aa199faeb8754aee94658f2c48ccb2c8c3 < 16d464013ec2267b00a83f4bfbb97b3ecc63bfa7`
- `Linux 6.1`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.