Linux Kernel ksmbd RCU Callback Race Condition Local Privilege Escalation Vulnerability
Vulnerability Details
This vulnerability allows local attackers to execute arbitrary code on affected installations of Linux Kernel. An attacker must first obtain the ability to execute high-privileged code on the target system in order to exploit this vulnerability.
The specific flaw exists within the handling of unloading of the ksmbd driver. The issue results from the lack of proper locking when performing operations on an object. An attacker can leverage this vulnerability to escalate privileges and execute code in the context of the kernel.
Additional Details
Linux has issued an update to correct this vulnerability. More details can be found at:
https://github.com/torvalds/linux/commit/eb307d09fe15844fdaebeb8cc8c9b9e925430aa5
Disclosure Timeline
- 2023-05-01 - Vulnerability reported to vendor
- 2023-05-17 - Coordinated public release of advisory
Credit
Quentin Minster (@thalium_team)
