Linux Kernel Netfilter Duplicate Device Registration Vulnerability

Publication date: 2026-05-08

Last updated on: 2026-05-20

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix for duplicate device in netdev hooks When handling NETDEV_REGISTER notification, duplicate device registration must be avoided since the device may have been added by nft_netdev_hook_alloc() already when creating the hook.

CVSS Scores

EPSS Scores

Probability:
Percentile:

Meta Information

Published

2026-05-08

Last Modified

2026-05-20

Generated

2026-07-09

AI Q&A

2026-05-08

EPSS Evaluated

2026-07-08

NVD

CVE-2026-43454

EUVD

EUVD-2026-28760

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	From 6.19 (inc) to 6.19.9 (exc)
linux	linux_kernel	From 6.16 (inc) to 6.18.19 (exc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel relates to the netfilter subsystem, specifically the nf_tables component. It involves a problem where a device could be registered more than once during the handling of NETDEV_REGISTER notifications. This happens because the device might have already been added by the nft_netdev_hook_alloc() function when creating the hook, leading to duplicate device registration.

Impact Analysis

Duplicate device registration in the netfilter hooks could potentially cause unexpected behavior in the network filtering functionality of the Linux kernel. This might lead to instability or errors in network packet processing, which could affect system reliability or security.

Hi! I’m here to help you understand CVE-2026-43454. Ask me anything about the vulnerability, its impact, or mitigation strategies.

0/70