BaseFortify

Publication date: 2025-10-28

Last updated on: 2025-10-30

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: nbd: restrict sockets to TCP and UDP Recently, syzbot started to abuse NBD with all kinds of sockets. Commit cf1b2326b734 ("nbd: verify socket is supported during setup") made sure the socket supported a shutdown() method. Explicitely accept TCP and UNIX stream sockets.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-10-28

Last Modified

2025-10-30

Generated

2026-07-07

AI Q&A

2025-10-28

EPSS Evaluated

2026-07-05

NVD

CVE-2025-40080

Affected Vendors & Products

Vendor	Product	Version / Range
linux	linux_kernel	*

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-UNKNOWN

Attack-Flow Graph

Executive Summary

This vulnerability in the Linux kernel's Network Block Device (nbd) subsystem involved improper socket restrictions. The system previously allowed various types of sockets, which syzbot (a kernel fuzzing tool) exploited by using unsupported socket types. The fix restricts nbd sockets explicitly to TCP and UNIX stream sockets and verifies that the socket supports the shutdown() method during setup, preventing misuse of unsupported socket types.

Impact Analysis

If exploited, this vulnerability could allow misuse or abuse of the nbd subsystem by using unsupported socket types, potentially leading to unexpected behavior or system instability. Restricting sockets to TCP and UNIX stream sockets helps prevent such abuse, improving system reliability and security.

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