Advisory Details

September 24th, 2025

Linux Kernel ksmbd smb2_sess_setup Preauth_HashValue Race Condition Remote Code Execution Vulnerability

CVE ID	CVE-2025-38561
CVSS SCORE	8.5, AV:N/AC:H/PR:L/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 required to exploit this vulnerability. The specific flaw exists within the handling of the Preauth_HashValue field. The issue results from the lack of proper locking when performing operations on an 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://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=44a3059c4c8cc635a1fb2afd692d0730ca1ba4b6
DISCLOSURE TIMELINE	2025-07-22 - Vulnerability reported to vendor 2025-09-24 - Coordinated public release of advisory 2025-09-24 - Advisory Updated
CREDIT	Nicholas Zubrisky (@NZubrisky) of Trend Research

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