---
id: CVE-2026-43451
title: 'netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path

  nfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue
  entry from the queue data s…
severity: none
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    a907bea273b60d3e604ec4e8e1f6c49954805794
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    0b18d1b834ab5a5009be70b530f978d7989e445b
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    b38d2b4603fd3dda24eb8b3dd81c18a0930be97b
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    47b1c5d1b0944aa88299f55a846fabaefc756982
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    cf4a4df38d1747e06fc54f9879bd7a6f4178032f
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    9853d94b82d303fc4ac37d592a23a154096ecd41
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    208669df703a25a601f45822b10c413f258bf275
  - >-
    Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e <
    f1ba83755d81c6fc66ac7acd723d238f974091e9
  - Linux 4.7
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-11-06T15:39:18.435118Z'
published: '2026-05-08'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T15:42:55.539Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-43451'
references:
  - url: 'https://git.kernel.org/stable/c/a907bea273b60d3e604ec4e8e1f6c49954805794'
  - url: 'https://git.kernel.org/stable/c/0b18d1b834ab5a5009be70b530f978d7989e445b'
  - url: 'https://git.kernel.org/stable/c/b38d2b4603fd3dda24eb8b3dd81c18a0930be97b'
  - url: 'https://git.kernel.org/stable/c/47b1c5d1b0944aa88299f55a846fabaefc756982'
  - url: 'https://git.kernel.org/stable/c/cf4a4df38d1747e06fc54f9879bd7a6f4178032f'
  - url: 'https://git.kernel.org/stable/c/9853d94b82d303fc4ac37d592a23a154096ecd41'
  - url: 'https://git.kernel.org/stable/c/208669df703a25a601f45822b10c413f258bf275'
  - url: 'https://git.kernel.org/stable/c/f1ba83755d81c6fc66ac7acd723d238f974091e9'
tags:
  - cve.org
epss: 0.00123
epssPercentile: 0.02035
ingestedAt: '2026-11-06T15:54:03.913Z'
---

## Overview

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

netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path

nfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue
entry from the queue data structures, taking ownership of the entry.
For PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN
attributes.  If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN
present but NFQA_VLAN_TCI missing), the function returns immediately
without freeing the dequeued entry or its sk_buff.

This leaks the nf_queue_entry, its associated sk_buff, and all held
references (net_device refcounts, struct net refcount).  Repeated
triggering exhausts kernel memory.

Fix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict
on the error path, consistent with other error handling in this file.

## Affected

- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < a907bea273b60d3e604ec4e8e1f6c49954805794`
- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < 0b18d1b834ab5a5009be70b530f978d7989e445b`
- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < b38d2b4603fd3dda24eb8b3dd81c18a0930be97b`
- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < 47b1c5d1b0944aa88299f55a846fabaefc756982`
- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < cf4a4df38d1747e06fc54f9879bd7a6f4178032f`
- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < 9853d94b82d303fc4ac37d592a23a154096ecd41`
- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < 208669df703a25a601f45822b10c413f258bf275`
- `Linux >= 8d45ff22f1b43249f0cf1baafe0262ca10d1666e < f1ba83755d81c6fc66ac7acd723d238f974091e9`
- `Linux 4.7`

## Remediation

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