---
id: CVE-2026-98624
title: 'netfilter: nfnetlink_queue: hold nfnl mutex in event notifier'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nfnetlink_queue: hold nfnl mutex in event notifier

  We must serialize the release notifier and the config netlink function.
  A concurrent thread can issue clo…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    46432f2e76f7c385d82506304a2928e7d293289f
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    597320337c3da06c92a9e95cfc755da66fedc476
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    2e9be1302f25c9be51c2fb8c907bc6d8a1050e33
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    d559e06a5ab7c064100aafd5c826eadd0f1c6216
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    1d1184411599a7c2217560bab3bbe641c6d03b95
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    8137a39e08e838ced234044384740ceeb99ed388
  - >-
    Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb <
    9461613afc59acef44a0071b0dd5075f6e993ffe
  - Linux 2.6.14
published: '2026-10-18'
updated: '2026-10-18'
sourceUpdated: '2026-10-18T15:19:45.566Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-98624'
references:
  - url: 'https://git.kernel.org/stable/c/46432f2e76f7c385d82506304a2928e7d293289f'
  - url: 'https://git.kernel.org/stable/c/597320337c3da06c92a9e95cfc755da66fedc476'
  - url: 'https://git.kernel.org/stable/c/2e9be1302f25c9be51c2fb8c907bc6d8a1050e33'
  - url: 'https://git.kernel.org/stable/c/d559e06a5ab7c064100aafd5c826eadd0f1c6216'
  - url: 'https://git.kernel.org/stable/c/1d1184411599a7c2217560bab3bbe641c6d03b95'
  - url: 'https://git.kernel.org/stable/c/07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1'
  - url: 'https://git.kernel.org/stable/c/8137a39e08e838ced234044384740ceeb99ed388'
  - url: 'https://git.kernel.org/stable/c/9461613afc59acef44a0071b0dd5075f6e993ffe'
tags:
  - cve.org
ingestedAt: '2026-10-18T15:45:12.236Z'
---

## Overview

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

netfilter: nfnetlink_queue: hold nfnl mutex in event notifier

We must serialize the release notifier and the config netlink function.
A concurrent thread can issue close() which can call the release function
while unrelated socket processes UNBIND request for same portid:

Oops: general protection fault, [..]
RIP: 0010:__instance_destroy+0x60/0x210 [nfnetlink_queue]
Call Trace:
 nfqnl_recv_config+0x9b0/0xdc0 [nfnetlink_queue]
 nfnetlink_rcv_msg+0x7c2/0xeb0
 ? __pfx_nfnetlink_rcv_msg+0x10/0x10

After this, parallel UNBIND and URELEASE events are impossible.

This change isn't nice, but its the shortest fix given instances
are not refcounted and the nfnetlink config callback drops the
rcu read lock early due to need for sleeping allocations.

## Affected

- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < 46432f2e76f7c385d82506304a2928e7d293289f`
- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < 597320337c3da06c92a9e95cfc755da66fedc476`
- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < 2e9be1302f25c9be51c2fb8c907bc6d8a1050e33`
- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < d559e06a5ab7c064100aafd5c826eadd0f1c6216`
- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < 1d1184411599a7c2217560bab3bbe641c6d03b95`
- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < 07a3ec8fdc5a1267c00cd6fd1cf8bbb5cda913c1`
- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < 8137a39e08e838ced234044384740ceeb99ed388`
- `Linux >= 7af4cc3fa158ff1dda6e7451c7e6afa6b0bb85cb < 9461613afc59acef44a0071b0dd5075f6e993ffe`
- `Linux 2.6.14`

## Remediation

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