VDB-237050 · CVE-2023-40283 · GCVE-0-2023-40283

Linux Kernel up to 6.4.9 l2cap_sock.c l2cap_sock_release 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.
7.0	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.4.9. Affected by this vulnerability is the function l2cap_sock_release of the file net/bluetooth/l2cap_sock.c. Such manipulation leads to use after free. This vulnerability is referenced as CVE-2023-40283. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.4.9 (Operating System). It has been rated as problematic. Affected by this issue is the function l2cap_sock_release of the file net/bluetooth/l2cap_sock.c. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. The impact remains unknown. CVE summarizes:

An issue was discovered in l2cap_sock_release in net/bluetooth/l2cap_sock.c in the Linux kernel before 6.4.10. There is a use-after-free because the children of an sk are mishandled.

The weakness was published 08/14/2023. The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2023-40283 since 08/14/2023. Technical details are known, but there is no available exploit.

Upgrading to version 6.4.10 eliminates this vulnerability. The upgrade is hosted for download at cdn.kernel.org. Applying a patch 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.

If you want to get best quality of vulnerability data, you may have to visit 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: 7.0
VulDB Meta Temp Score: 7.0

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

NVD Base Score: 7.8
NVD Vector: 🔍

ADP CISA Base Score: 7.8
ADP CISA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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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

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.4.10
Patch: git.kernel.org

Timelineinfo

08/14/2023 🔍
08/14/2023 +0 days 🔍
08/14/2023 +0 days 🔍
02/26/2026 +927 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: 1728137b33c00d5a2b5110ed7aafb42e7c32e4a1
Status: Confirmed

CVE: CVE-2023-40283 (🔍)
GCVE (CVE): GCVE-0-2023-40283
GCVE (VulDB): GCVE-100-237050

Entryinfo

Created: 08/14/2023 07:01
Updated: 02/26/2026 08:40
Changes: 08/14/2023 07:01 (43), 09/08/2023 15:27 (1), 09/08/2023 15:33 (11), 02/26/2026 08:40 (26)
Complete: 🔍
Cache ID: 216::103