---
id: CVE-2023-6622
title: 'Kernel: null pointer dereference vulnerability in nft_dynset_init()'
summary: >-
  A null pointer dereference vulnerability was found in nft_dynset_init() in
  net/netfilter/nft_dynset.c in nf_tables in the Linux kernel. This issue may
  allow a local attacker with CAP_NET_ADMIN user privilege to trigger a denial
  of service.
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: cna
cwe:
  - CWE-476
vendor: Red Hat
product: kernel-rt
affected:
  - kernel-rt (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel (all versions)
  - kernel
  - kernel
  - kernel-rt
  - kernel-rt (all versions)
published: '2023-12-08'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T11:37:23.528Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-6622'
references:
  - url: 'https://access.redhat.com/errata/RHSA-2024:2394'
    label: 'RHSA-2024:2394'
  - url: 'https://access.redhat.com/errata/RHSA-2024:2950'
    label: 'RHSA-2024:2950'
  - url: 'https://access.redhat.com/errata/RHSA-2024:3138'
    label: 'RHSA-2024:3138'
  - url: 'https://access.redhat.com/security/cve/CVE-2023-6622'
  - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2253632'
    label: RHBZ#2253632
  - url: >-
      https://github.com/torvalds/linux/commit/3701cd390fd731ee7ae8b8006246c8db82c72bea
tags:
  - cve.org
epss: 0.00321
epssPercentile: 0.25281
ingestedAt: '2026-11-05T21:36:00.810Z'
---

## Overview

A null pointer dereference vulnerability was found in nft_dynset_init() in net/netfilter/nft_dynset.c in nf_tables in the Linux kernel. This issue may allow a local attacker with CAP_NET_ADMIN user privilege to trigger a denial of service.

## Affected

- `kernel-rt (all versions)`
- `kernel (all versions)`
- `kernel (all versions)`
- `kernel (all versions)`
- `kernel`
- `kernel`
- `kernel-rt`
- `kernel-rt (all versions)`

## Remediation

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

### Workarounds

Mitigation for this issue is to skip loading the affected module "netfilter" onto the system till we have a fix available, this can be done by a blacklist mechanism, this will ensure the driver is not loaded at the boot time.
~~~
How do I blacklist a kernel module to prevent it from loading automatically?
https://access.redhat.com/solutions/41278