VDB-236770 · CVE-2023-4128 · Nessus 276356

Linux Kernel net-sched cls_fw/cls_u32/cls_route use after free

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.5	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel. The affected element is the function cls_fw/cls_u32/cls_route of the component net-sched. Executing a manipulation can lead to use after free. This vulnerability is registered as CVE-2023-4128. No exploit is available. A patch should be applied to remediate this issue.

Detailsinfo

A vulnerability was found in Linux Kernel (Operating System) (affected version not known). It has been declared as problematic. This vulnerability affects the function cls_fw/cls_u32/cls_route of the component net-sched. The manipulation with an unknown input leads to a use after free vulnerability. The CWE definition for the vulnerability is CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was published 08/10/2023. The advisory is available at bugzilla.redhat.com. This vulnerability was named CVE-2023-4128 since 08/03/2023. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 276356 (TencentOS Server 3: kernel (TSSA-2023:0340)), which helps to determine the existence of the flaw in a target environment.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at lore.kernel.org.

The vulnerability is also documented in the vulnerability database at Tenable (276356). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

License

open-source

Website

Vendor: https://www.kernel.org/

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 (Red Hat, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Use after free
CWE: CWE-416 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Nessus ID: 276356
Nessus Name: TencentOS Server 3: kernel (TSSA-2023:0340)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: lore.kernel.org

Timelineinfo

08/03/2023 🔍
08/10/2023 +7 days 🔍
08/10/2023 +0 days 🔍
11/23/2025 +836 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: FEDORA-2023-d9509be489
Status: Confirmed

CVE: CVE-2023-4128 (🔍)
GCVE (CVE): GCVE-0-2023-4128
GCVE (VulDB): GCVE-100-236770

Entryinfo

Created: 08/10/2023 15:10
Updated: 11/23/2025 13:13
Changes: 08/10/2023 15:10 (39), 09/05/2023 09:13 (2), 09/05/2023 09:14 (12), 11/23/2025 13:13 (17)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.