---
id: CVE-2023-52927
title: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: allow exp not to be removed in nf_ct_find_expectation

  Currently nf_conntrack_in() calling nf_ct_find_expectation() will
  remove the exp from the hash table
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: allow exp not to be removed in nf_ct_find_expectation

  Currently nf_conntrack_in() calling nf_ct_find_expectation() will
  remove the exp from the hash table. …
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-416
vendor: linux
product: linux_kernel
affected:
  - 'linux_kernel >= 5.18, < 6.1.130'
  - 'linux_kernel >= 6.2, < 6.6'
  - debian_linux = 11.0
patched:
  - linux_kernel 6.6
published: '2025-03-14'
updated: '2026-07-14'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2023-52927'
references:
  - url: 'https://git.kernel.org/stable/c/3fa58a6fbd1e9e5682d09cdafb08fba004cb12ec'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://git.kernel.org/stable/c/4914109a8e1e494c6aa9852f9e84ec77a5fc643f'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://seadragnol.github.io/posts/CVE-2023-52927/'
    label: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
  - url: 'https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html'
    label: af854a3a-2127-422b-91ae-364da2661108
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-019113.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
  - url: 'https://cert-portal.siemens.com/productcert/html/ssa-082556.html'
    label: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e
tags:
  - nvd
  - cve.org
  - exploit-available
epss: 0.00311
epssPercentile: 0.21347
ingestedAt: '2026-07-14T13:36:55.958Z'
exploits:
  github: 2
  githubRepos:
    - 'https://github.com/seadragnol/CVE-2023-52927'
    - 'https://github.com/HoangNhoo/Reproduce-CVE-2023-52927'
  checkedAt: '2026-09-26T09:05:32.236Z'
exploitAvailable: true
---

## Overview

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

netfilter: allow exp not to be removed in nf_ct_find_expectation

Currently nf_conntrack_in() calling nf_ct_find_expectation() will
remove the exp from the hash table. However, in some scenario, we
expect the exp not to be removed when the created ct will not be
confirmed, like in OVS and TC conntrack in the following patches.

This patch allows exp not to be removed by setting IPS_CONFIRMED
in the status of the tmpl.

## Affected

- `linux_kernel >= 5.18, < 6.1.130`
- `linux_kernel >= 6.2, < 6.6`
- `debian_linux = 11.0`

## Remediation

Upgrade past the affected range:

- `linux_kernel 6.6`