---
id: CVE-2024-27020
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

  nft_unregister_expr() can concurrent with __nft_expr_type_get(),
  and there is not any protection…
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

  nft_unregister_expr() can concurrent with __nft_expr_type_get(),
  and there is not any protection…
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'
cwe:
  - CWE-362
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 3.13, < 4.19.313'
  - 'linux_kernel >= 4.20, < 5.4.275'
  - 'linux_kernel >= 5.5, < 5.10.216'
  - 'linux_kernel >= 5.11, < 5.15.157'
  - 'linux_kernel >= 5.16, < 6.1.88'
  - 'linux_kernel >= 6.2, < 6.6.29'
  - 'linux_kernel >= 6.7, < 6.8.8'
  - linux_kernel = 6.9
patched:
  - linux_kernel 6.8.8
published: '2024-05-01'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T01:17:36.473'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2024-27020'
references:
  - url: 'https://git.kernel.org/stable/c/01f1a678b05ade4b1248019c2dcca773aebbeb7f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/0b6de00206adbbfc6373b3ae38d2a6f197987907'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/8d56bad42ac4c43c6c72ddd6a654a2628bf839c5'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/934e66e231cff2b18faa2c8aad0b8cec13957e05'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/939109c0a8e2a006a6cc8209e262d25065f4403a'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/a9ebf340d123ae12582210407f879d6a5a1bc25b'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/b38a133d37fa421c8447b383d788c9cc6f5cb34c'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/f969eb84ce482331a991079ab7a5c4dc3b7f89bf'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/01f1a678b05ade4b1248019c2dcca773aebbeb7f'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/0b6de00206adbbfc6373b3ae38d2a6f197987907'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/8d56bad42ac4c43c6c72ddd6a654a2628bf839c5'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/934e66e231cff2b18faa2c8aad0b8cec13957e05'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/939109c0a8e2a006a6cc8209e262d25065f4403a'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/a9ebf340d123ae12582210407f879d6a5a1bc25b'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/b38a133d37fa421c8447b383d788c9cc6f5cb34c'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://git.kernel.org/stable/c/f969eb84ce482331a991079ab7a5c4dc3b7f89bf'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/4EZ6PJW7VOZ224TD7N4JZNU6KV32ZJ53/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DAMSOZXJEPUOXW33WZYWCVAY7Z5S7OOY/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: >-
      https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/GCBZZEC7L7KTWWAS2NLJK6SO3IZIL4WW/
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-265688.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-398330.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-613116.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
epss: 0.00221
epssPercentile: 0.11779
ingestedAt: '2026-10-15T03:30:12.668Z'
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2024-10-30T19:26:58.391230Z'
---

## Overview

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

netfilter: nf_tables: Fix potential data-race in __nft_expr_type_get()

nft_unregister_expr() can concurrent with __nft_expr_type_get(),
and there is not any protection when iterate over nf_tables_expressions
list in __nft_expr_type_get(). Therefore, there is potential data-race
of nf_tables_expressions list entry.

Use list_for_each_entry_rcu() to iterate over nf_tables_expressions
list in __nft_expr_type_get(), and use rcu_read_lock() in the caller
nft_expr_type_get() to protect the entire type query process.

## Affected

- `linux_kernel >= 3.13, < 4.19.313`
- `linux_kernel >= 4.20, < 5.4.275`
- `linux_kernel >= 5.5, < 5.10.216`
- `linux_kernel >= 5.11, < 5.15.157`
- `linux_kernel >= 5.16, < 6.1.88`
- `linux_kernel >= 6.2, < 6.6.29`
- `linux_kernel >= 6.7, < 6.8.8`
- `linux_kernel = 6.9`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.8.8`