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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-53183 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: allow subflow rcv wnd to shrink In MPTCP connection, the `window` field in the TCP header refers to the MPTCP-level rcv_nxt and it's right edge should not move backward. Such constraint is enforced at DSS option generation time. At the same time, the TCP stack ensures independently that the TCP-level rcv wnd right's edge does not move backward. That in turn causes artificial inflating of the MPTCP rcv window when the incoming data is acked at the TCP level and is OoO in the MPTCP sequence space (or lands in the backlog). As a consequence, the incoming traffic can exceed the receiver rcvbuf size even when the sender is not misbehaving. Prevent such scenario forcibly allowing the TCP subflow to shrink the TCP-level rcv wnd regardless of the current netns setting.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/653245266913f03fcf21cbca68eed5c197a33e52 kernel.org
https://git.kernel.org/stable/c/aa3861f40ac32706d9e97bfac76984613e278788 kernel.org
https://git.kernel.org/stable/c/b1fd13074f22105deec45aa02283e322733e0c2d kernel.org
https://git.kernel.org/stable/c/bf364b0f10b27679140699821f88af7f01e2a6e3 kernel.org
https://git.kernel.org/stable/c/c297a4e65c50a2b807d9309b22615080faffa8f3 kernel.org
https://git.kernel.org/stable/c/da23be77e1292cd611e736c3aa17da633d7ddce7 kernel.org

Weakness Enumeration

CWE-ID CWE Name Source

Change History

1 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-53183
NVD Published Date:
06/25/2026
NVD Last Modified:
06/25/2026
Source:
kernel.org