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Vulnerability record · CVE-2026-53183 · published 25 June 2026

CVE-2026-53183: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.48% · top 61.1%
7.5CVSS 3.1 base score
0.48%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
6References
6 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/653245266913f03fcf21cbca68eed5c197a33e52 Patch
https://git.kernel.org/stable/c/aa3861f40ac32706d9e97bfac76984613e278788 Patch
https://git.kernel.org/stable/c/b1fd13074f22105deec45aa02283e322733e0c2d Patch
https://git.kernel.org/stable/c/bf364b0f10b27679140699821f88af7f01e2a6e3 Patch
https://git.kernel.org/stable/c/c297a4e65c50a2b807d9309b22615080faffa8f3 Patch
https://git.kernel.org/stable/c/da23be77e1292cd611e736c3aa17da633d7ddce7 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53183), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.