Advisory Details

May 17th, 2023

Linux Kernel ksmbd RCU Callback Race Condition Local Privilege Escalation Vulnerability

CVE ID	CVE-2023-32246
CVSS SCORE	5.0, AV:L/AC:H/PR:H/UI:N/S:C/C:L/I:L/A:L
AFFECTED VENDORS	Linux
AFFECTED PRODUCTS	Kernel
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)

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