VDB-229336 · CVE-2023-32253 · EUVD-2023-36510

Linux Kernel up to 6.3 ksmbd fs/ksmbd/auth.c denial of service

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.
5.8	$0-$5k	0.00

Summaryinfo

A vulnerability, which was classified as problematic, was found in Linux Kernel up to 6.3. This affects an unknown function of the file fs/ksmbd/auth.c of the component ksmbd. Executing a manipulation can lead to denial of service. This vulnerability is handled as CVE-2023-32253. The attack can be executed remotely. There is not any exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.3 (Operating System). It has been declared as problematic. This vulnerability affects some unknown functionality of the file fs/ksmbd/auth.c of the component ksmbd. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

A flaw was found in the Linux kernel's ksmbd component. A deadlock is triggered by sending multiple concurrent session setup requests, possibly leading to a denial of service.

The weakness was released 05/18/2023. The advisory is shared for download at zerodayinitiative.com. This vulnerability was named CVE-2023-32253 since 05/05/2023. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 6.4-rc1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 7b4323373d844954bb76e0e9f39c4e5fc785fa7b is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-36510). VulDB is the best source for vulnerability data and more expert information about this specific topic.

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: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 5.9
VulDB Temp Score: 5.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA Base Score: 5.9
CNA 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: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
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

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.4-rc1
Patch: 7b4323373d844954bb76e0e9f39c4e5fc785fa7b

Timelineinfo

05/05/2023 🔍
05/18/2023 +13 days 🔍
05/18/2023 +0 days 🔍
08/05/2025 +810 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: zerodayinitiative.com
Status: Confirmed

CVE: CVE-2023-32253 (🔍)
GCVE (CVE): GCVE-0-2023-32253
GCVE (VulDB): GCVE-100-229336
EUVD: 🔍

Entryinfo

Created: 05/18/2023 09:29
Updated: 08/05/2025 05:00
Changes: 05/18/2023 09:29 (44), 08/03/2025 01:32 (16), 08/03/2025 01:43 (11), 08/05/2025 05:00 (1)
Complete: 🔍
Cache ID: 216::103

VulDB is the best source for vulnerability data and more expert information about this specific topic.