BaseFortify

Publication date: 2025-12-16

Last updated on: 2025-12-18

Assigner: kernel.org

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix address removal logic in mptcp_pm_nl_rm_addr Fix inverted WARN_ON_ONCE condition that prevented normal address removal counter updates. The current code only executes decrement logic when the counter is already 0 (abnormal state), while normal removals (counter > 0) are ignored.

CVSS Scores

EPSS Scores

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Meta Information

Published

2025-12-16

Last Modified

2025-12-18

Generated

2026-07-06

AI Q&A

2025-12-16

EPSS Evaluated

2026-07-05

NVD

CVE-2025-68221

EUVD

EUVD-2025-203675

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 is in the Linux kernel's multipath TCP (mptcp) implementation. Specifically, it involves a flaw in the address removal logic within the mptcp_pm_nl_rm_addr function. The issue is that the code incorrectly handles the decrementing of an address removal counter due to an inverted WARN_ON_ONCE condition. As a result, normal address removals where the counter is greater than zero are ignored, and only abnormal cases where the counter is zero trigger the decrement logic. This could lead to improper management of address removal in multipath TCP.

Impact Analysis

The vulnerability can impact the stability and correctness of multipath TCP connections on affected Linux systems. Because normal address removals are ignored, the system may not properly update or manage network addresses used in multipath TCP, potentially leading to connection issues, resource leaks, or unexpected network behavior. This could affect applications relying on multipath TCP for network redundancy or performance.

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