VDB-218149 · CVE-2023-23454 · EUVD-2023-27554

Linux Kernel up to 6.1.4 net/sched/sch_cbq.c cbq_classify out-of-bounds

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.
5.9	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 6.1.4. This affects the function cbq_classify of the file net/sched/sch_cbq.c. This manipulation causes out-of-bounds. The identification of this vulnerability is CVE-2023-23454. It is possible to initiate the attack remotely. There is no exploit available. Applying a patch is the recommended action to fix this issue.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.1.4 (Operating System). It has been declared as critical. Affected by this vulnerability is the function cbq_classify of the file net/sched/sch_cbq.c. The manipulation with an unknown input leads to a out-of-bounds vulnerability. The CWE definition for the vulnerability is CWE-125. The product reads data past the end, or before the beginning, of the intended buffer. As an impact it is known to affect availability. The summary by CVE is:

cbq_classify in net/sched/sch_cbq.c in the Linux kernel through 6.1.4 allows attackers to cause a denial of service (slab-out-of-bounds read) because of type confusion (non-negative numbers can sometimes indicate a TC_ACT_SHOT condition rather than valid classification results).

The weakness was shared 01/12/2023. The advisory is shared at git.kernel.org. This vulnerability is known as CVE-2023-23454 since 01/12/2023. Technical details are known, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 236642 (Alibaba Cloud Linux 3 : 0042: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2023:0042)), 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 git.kernel.org.

The vulnerability is also documented in the databases at Tenable (236642) and EUVD (EUVD-2023-27554). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Operating System

Vendor

Linux

Name

Kernel

Version

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: 6.0
VulDB Meta Temp Score: 5.9

VulDB Base Score: 6.5
VulDB Temp Score: 6.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Out-of-bounds
CWE: CWE-125 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Nessus ID: 236642
Nessus Name: Alibaba Cloud Linux 3 : 0042: cloud-kernel bugfix, enhancement and (ALINUX3-SA-2023:0042)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.kernel.org

Timelineinfo

01/12/2023 🔍
01/12/2023 +0 days 🔍
01/12/2023 +0 days 🔍
10/07/2025 +999 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-23454 (🔍)
GCVE (CVE): GCVE-0-2023-23454
GCVE (VulDB): GCVE-100-218149
EUVD: 🔍

Entryinfo

Created: 01/12/2023 15:45
Updated: 10/07/2025 17:47
Changes: 01/12/2023 15:45 (42), 02/05/2023 07:25 (11), 03/21/2025 01:03 (16), 05/19/2025 19:15 (2), 10/07/2025 17:47 (1)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.