---
id: CVE-2026-23391
title: 'netfilter: xt_CT: drop pending enqueued packets on template removal'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: xt_CT: drop pending enqueued packets on template removal

  Templates refer to objects that can go away while packets are sitting in
  nfqueue refer to:

  - helpe…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    55445134d42b84cb0a272e42c98d233ca65eca83
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    cc57506dd66555899560b9c0f24e813f034e12ec
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    d2d0bae0c9a2a17b6990a2966f5cdce0813d6256
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    63b8097cea1923fe82cd598068d0796da8c015ec
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    19a230dec6bb8928e3f96387f9085cf2c79bcef9
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    cb549925875fa06dd155e49db4ac2c5044c30f9c
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    777d02efe3d630cca4c1b63962cec17c57711325
  - >-
    Linux >= 24de58f465165298aaa8f286b2592f0163706cfe <
    f62a218a946b19bb59abdd5361da85fa4606b96b
  - Linux 3.4
published: '2026-03-25'
updated: '2026-09-08'
sourceUpdated: '2026-09-08T08:45:54.799Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-23391'
references:
  - url: 'https://git.kernel.org/stable/c/55445134d42b84cb0a272e42c98d233ca65eca83'
  - url: 'https://git.kernel.org/stable/c/cc57506dd66555899560b9c0f24e813f034e12ec'
  - url: 'https://git.kernel.org/stable/c/d2d0bae0c9a2a17b6990a2966f5cdce0813d6256'
  - url: 'https://git.kernel.org/stable/c/63b8097cea1923fe82cd598068d0796da8c015ec'
  - url: 'https://git.kernel.org/stable/c/19a230dec6bb8928e3f96387f9085cf2c79bcef9'
  - url: 'https://git.kernel.org/stable/c/cb549925875fa06dd155e49db4ac2c5044c30f9c'
  - url: 'https://git.kernel.org/stable/c/777d02efe3d630cca4c1b63962cec17c57711325'
  - url: 'https://git.kernel.org/stable/c/f62a218a946b19bb59abdd5361da85fa4606b96b'
tags:
  - cve.org
epss: 0.00128
epssPercentile: 0.02844
ingestedAt: '2026-09-08T15:33:26.992Z'
---

## Overview

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

netfilter: xt_CT: drop pending enqueued packets on template removal

Templates refer to objects that can go away while packets are sitting in
nfqueue refer to:

- helper, this can be an issue on module removal.
- timeout policy, nfnetlink_cttimeout might remove it.

The use of templates with zone and event cache filter are safe, since
this just copies values.

Flush these enqueued packets in case the template rule gets removed.

## Affected

- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < 55445134d42b84cb0a272e42c98d233ca65eca83`
- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < cc57506dd66555899560b9c0f24e813f034e12ec`
- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < d2d0bae0c9a2a17b6990a2966f5cdce0813d6256`
- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < 63b8097cea1923fe82cd598068d0796da8c015ec`
- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < 19a230dec6bb8928e3f96387f9085cf2c79bcef9`
- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < cb549925875fa06dd155e49db4ac2c5044c30f9c`
- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < 777d02efe3d630cca4c1b63962cec17c57711325`
- `Linux >= 24de58f465165298aaa8f286b2592f0163706cfe < f62a218a946b19bb59abdd5361da85fa4606b96b`
- `Linux 3.4`

## Remediation

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