Linux Kernel up to 6.18.18/6.19.8 nft_netdev_hook_alloc privilege escalation

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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6.5$0-$5k0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.18.18/6.19.8 and classified as problematic. Impacted is the function nft_netdev_hook_alloc. The manipulation results in an unknown weakness. This vulnerability was named CVE-2026-43454. There is no available exploit. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 6.18.18/6.19.8. The impact remains unknown. CVE summarizes:

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.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2026-43454 since 05/01/2026. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 05/21/2026).

The vulnerability scanner Nessus provides a plugin with the ID 313467 (Linux Distros Unpatched Vulnerability : CVE-2026-43454), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.18.19 or 6.19.9 eliminates this vulnerability. Applying the patch 6d2a95c6890577cc3eab2b20018e16850d7fb094/2041cdb078041611510fc189410bc70b29f688fb/b7cdc5a97d02c943f4bdde4d5767ad0c13cad92b is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (313467). Once again VulDB remains the best source for vulnerability data.

Productinfo

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Name

Version

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Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 7.8
CNA Vector (Linux): 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Privilege escalation
CWE: Unknown
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 313467
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2026-43454

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.19/6.19.9
Patch: 6d2a95c6890577cc3eab2b20018e16850d7fb094/2041cdb078041611510fc189410bc70b29f688fb/b7cdc5a97d02c943f4bdde4d5767ad0c13cad92b

Timelineinfo

05/01/2026 CVE reserved
05/08/2026 +7 days Advisory disclosed
05/08/2026 +0 days VulDB entry created
05/21/2026 +13 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-43454 (🔒)
GCVE (CVE): GCVE-0-2026-43454
GCVE (VulDB): GCVE-100-362268

Entryinfo

Created: 05/08/2026 18:38
Updated: 05/21/2026 03:20
Changes: 05/08/2026 18:38 (56), 05/09/2026 20:53 (2), 05/21/2026 03:20 (11)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

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