Linux Kernel up to 6.3 ksmbd fs/ksmbd/smb2pdu.c improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.3. This issue affects some unknown processing of the file fs/ksmbd/smb2pdu.c of the component ksmbd. The manipulation leads to improper authentication. This vulnerability is listed as CVE-2023-32249. The attack may be initiated remotely. There is no available exploit. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.3 (Operating System) and classified as critical. This issue affects some unknown functionality of the file fs/ksmbd/smb2pdu.c of the component ksmbd. The manipulation with an unknown input leads to a improper authentication vulnerability. Using CWE to declare the problem leads to CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: ksmbd: not allow guest user on multichannel This patch return STATUS_NOT_SUPPORTED if binding session is guest.

The weakness was presented 05/18/2023. It is possible to read the advisory at zerodayinitiative.com. The identification of this vulnerability is CVE-2023-32249 since 05/05/2023. Technical details of the vulnerability are known, but there is no available exploit.

Upgrading to version 6.4-rc1 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2 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.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
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-rc1
Patch: 3353ab2df5f68dab7da8d5ebb427a2d265a1f2b2

Timelineinfo

05/05/2023 🔍
05/18/2023 +13 days 🔍
05/18/2023 +0 days 🔍
11/19/2025 +916 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: zerodayinitiative.com
Status: Confirmed

CVE: CVE-2023-32249 (🔍)
GCVE (CVE): GCVE-0-2023-32249
GCVE (VulDB): GCVE-100-229343

Entryinfo

Created: 05/18/2023 09:32
Updated: 11/19/2025 02:42
Changes: 05/18/2023 09:32 (44), 08/16/2025 16:54 (16), 11/19/2025 02:42 (10)
Complete: 🔍
Cache ID: 216::103

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