VDB-252802 · CVE-2023-6240 · EUVD-2023-58486

Linux Kernel RSA Decryption Marvin Attack transmission of private resources into a new sphere ('resource leak')

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.
6.3	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel and classified as critical. Affected by this vulnerability is an unknown functionality of the component RSA Decryption. Executing a manipulation can lead to transmission of private resources into a new sphere ('resource leak'). This vulnerability is tracked as CVE-2023-6240. The attack can be launched remotely. Moreover, an exploit is present.

Detailsinfo

A vulnerability classified as critical was found in Linux Kernel (Operating System) (the affected version is unknown). This vulnerability affects an unknown code of the component RSA Decryption. The manipulation with an unknown input leads to a transmission of private resources into a new sphere ('resource leak') vulnerability. The CWE definition for the vulnerability is CWE-402. The product makes resources available to untrusted parties when those resources are only intended to be accessed by the product. As an impact it is known to affect confidentiality, and integrity. CVE summarizes:

A Marvin vulnerability side-channel leakage was found in the RSA decryption operation in the Linux Kernel. This issue may allow a network attacker to decrypt ciphertexts or forge signatures, limiting the services that use that private key.

The weakness was disclosed 02/04/2024. The advisory is available at access.redhat.com. This vulnerability was named CVE-2023-6240 since 11/21/2023. Technical details are unknown but a public exploit is available. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 11/08/2025).

It is possible to download the exploit at securitypitfalls.wordpress.com. It is declared as proof-of-concept. As 0-day the estimated underground price was around $5k-$25k.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-58486). 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: 6.5
VulDB Meta Temp Score: 6.3

VulDB Base Score: 6.5
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 6.5
NVD Vector: 🔍

CNA Base Score: 6.5
CNA Vector (Red Hat, Inc.): 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

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

Exploitinginfo

Class: Transmission of private resources into a new sphere ('resource leak')
CWE: CWE-402
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

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: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

11/21/2023 🔍
02/04/2024 +75 days 🔍
02/04/2024 +0 days 🔍
11/08/2025 +643 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: access.redhat.com
Status: Not defined

CVE: CVE-2023-6240 (🔍)
GCVE (CVE): GCVE-0-2023-6240
GCVE (VulDB): GCVE-100-252802
EUVD: 🔍
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 02/04/2024 17:11
Updated: 11/08/2025 11:53
Changes: 02/04/2024 17:11 (51), 06/05/2024 19:45 (25), 11/08/2025 11:53 (2)
Complete: 🔍
Cache ID: 216::103

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