VDB-242195 · CVE-2023-40791 · GCVE-0-2023-40791

Linux Kernel up to 6.4.1 Page Pinning lib/scatterlist.c extract_user_to_sg privilege escalation

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.
7.2	$0-$5k	0.00

Summaryinfo

A vulnerability identified as problematic has been detected in Linux Kernel up to 6.4.1. This affects the function extract_user_to_sg in the library lib/scatterlist.c of the component Page Pinning Handler. The manipulation leads to an unknown weakness. This vulnerability is referenced as CVE-2023-40791. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.4.1 (Operating System) and classified as problematic. This issue affects the function extract_user_to_sg in the library lib/scatterlist.c of the component Page Pinning Handler. The impact remains unknown. The summary by CVE is:

extract_user_to_sg in lib/scatterlist.c in the Linux kernel before 6.4.2 fails to unpin pages in a certain situation, as demonstrated by a WARNING for try_grab_page.

The weakness was published 10/16/2023. It is possible to read the advisory at git.kernel.org. The identification of this vulnerability is CVE-2023-40791 since 08/22/2023. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.4.2 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.

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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: 7.3
VulDB Meta Temp Score: 7.2

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

NVD Base Score: 9.1
NVD Vector: 🔍

CVSSv2info

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

Exploitinginfo

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

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.4.2
Patch: git.kernel.org

Timelineinfo

08/22/2023 🔍
10/16/2023 +55 days 🔍
10/16/2023 +0 days 🔍
11/02/2023 +17 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2023-40791 (🔍)
GCVE (CVE): GCVE-0-2023-40791
GCVE (VulDB): GCVE-100-242195

Entryinfo

Created: 10/16/2023 07:40
Updated: 11/02/2023 15:03
Changes: 10/16/2023 07:40 (43), 11/02/2023 15:03 (11)
Complete: 🔍
Cache ID: 216::103