Linux Kernel up to 6.3 ksmbd fs/ksmbd/server.c ksmbd_server_init race condition

Summaryinfo

A vulnerability categorized as problematic has been discovered in Linux Kernel up to 6.3. This vulnerability affects the function ksmbd_server_init of the file fs/ksmbd/server.c of the component ksmbd. Executing a manipulation can lead to race condition. This vulnerability is tracked as CVE-2023-32246. The attack is restricted to local execution. No exploit exists. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.3 (Operating System) and classified as problematic. This vulnerability affects the function ksmbd_server_init of the file fs/ksmbd/server.c of the component ksmbd. The manipulation with an unknown input leads to a race condition vulnerability. The CWE definition for the vulnerability is CWE-362. The product contains a code sequence that can run concurrently with other code, and the code sequence requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence that is operating concurrently. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ksmbd: call rcu_barrier() in ksmbd_server_exit() racy issue is triggered the bug by racing between closing a connection and rmmod. In ksmbd, rcu_barrier() is not called at module unload time, so nothing prevents ksmbd from getting unloaded while it still has RCU callbacks pending. It leads to trigger unintended execution of kernel code locally and use to defeat protections such as Kernel Lockdown

The weakness was disclosed 05/18/2023. The advisory is available at zerodayinitiative.com. This vulnerability was named CVE-2023-32246 since 05/05/2023. Technical details 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 eb307d09fe15844fdaebeb8cc8c9b9e925430aa5 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.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.0
• 6.1
• 6.2
• 6.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

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