Advisory Details

December 22nd, 2022

Linux Kernel ksmbd Use-After-Free Remote Code Execution Vulnerability

CVE ID	CVE-2022-47939
CVSS SCORE	10.0, AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
AFFECTED VENDORS	Linux
AFFECTED PRODUCTS	Kernel
VULNERABILITY DETAILS	This vulnerability allows remote attackers to execute arbitrary code on affected installations of Linux Kernel. Authentication is not required to exploit this vulnerability, but only systems with ksmbd enabled are vulnerable. The specific flaw exists within the processing of SMB2_TREE_DISCONNECT commands. The issue results from the lack of validating the existence of an object prior to performing operations on the object. An attacker can leverage this vulnerability to 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://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15.61
DISCLOSURE TIMELINE	2022-07-26 - Vulnerability reported to vendor 2022-12-22 - Coordinated public release of advisory 2023-01-23 - Advisory Updated
CREDIT	Arnaud Gatignol, Quentin Minster, Florent Saudel, Guillaume Teissier (@thalium_team)

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