CVE-2025-68221
Unknown Unknown - Not Provided
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.
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Meta Information
Published
2025-12-16
Last Modified
2025-12-18
Generated
2026-06-16
AI Q&A
2025-12-16
EPSS Evaluated
2026-06-15
NVD
CVE-2025-68221
EUVD
EUVD-2025-203675
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
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Exploitability
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CWE ID Description
CWE-UNKNOWN
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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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