Linux Kernel up to 6.7-rc5 SMB Client fs/smb/client/smb2ops.c receive_encrypted_standard integer underflow

Summaryinfo

A vulnerability marked as critical has been reported in Linux Kernel up to 6.7-rc5. This impacts the function receive_encrypted_standard of the file fs/smb/client/smb2ops.c of the component SMB Client. This manipulation causes integer underflow. This vulnerability is registered as CVE-2024-0565. Remote exploitation of the attack is possible. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.7-rc5 (Operating System). It has been declared as critical. Affected by this vulnerability is the function receive_encrypted_standard of the file fs/smb/client/smb2ops.c of the component SMB Client. The manipulation with an unknown input leads to a integer underflow vulnerability. The CWE definition for the vulnerability is CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

An out-of-bounds memory read flaw was found in receive_encrypted_standard in fs/smb/client/smb2ops.c in the SMB Client sub-component in the Linux Kernel. This issue occurs due to integer underflow on the memcpy length, leading to a denial of service.

The weakness was published 01/15/2024. The advisory is shared at access.redhat.com. This vulnerability is known as CVE-2024-0565. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/26/2025).

The vulnerability scanner Nessus provides a plugin with the ID 240010 (TencentOS Server 2: kernel (TSSA-2024:1031)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.7-rc6 eliminates this vulnerability. Applying a patch is able to eliminate this problem. The bugfix is ready for download at spinics.net. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (240010) and EUVD (EUVD-2024-16358). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.7-rc1
• 6.7-rc2
• 6.7-rc3
• 6.7-rc4
• 6.7-rc5

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍
• 🔍
• 🔍

CPE 2.2info

• 🔍
• 🔍
• 🔍

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Discussion