Out-of-Bounds Write Vulnerability in Linux Kernel ksmbd Component

CVE-2025-37947

What is CVE-2025-37947?

CVE-2025-37947 is a notable vulnerability found within the Linux kernel's ksmbd component, which is responsible for implementing the SMB (Server Message Block) protocol that enables shared access to files, printers, and serial ports between nodes on a network. This particular vulnerability arises from the ksmbd_vfs_stream_write() function, which fails to properly validate the offset for write operations against the existing stream data length. If an attacker is able to manipulate the write offset to exceed the bounds of the current stream data, it can lead to an out-of-bounds memory write. Such vulnerabilities can threaten the integrity and stability of systems, as they may disrupt the normal functioning of the kernel and potentially allow unauthorized access to vulnerable data structures.

Potential impact of CVE-2025-37947

1. System Compromise: Exploitation of this vulnerability may allow attackers to perform arbitrary memory writes, leading to critical system instability or potentially taking control of the affected system.

2. Data Corruption: Out-of-bounds writes can corrupt data within the memory space, affecting data integrity and leading to unpredictable behavior of applications relying on the impacted kernel component.

3. Increased Attack Surface: The presence of this vulnerability may be leveraged by attackers to escalate privileges or execute additional payloads, thus broadening the potential impact and increasing the severity of an attack against an organization’s infrastructure.

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