CVE-2026-53183

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.

• https://git.kernel.org/stable/c/653245266913f03fcf21cbca68eed5c197a33e52Patch
• https://git.kernel.org/stable/c/aa3861f40ac32706d9e97bfac76984613e278788Patch
• https://git.kernel.org/stable/c/b1fd13074f22105deec45aa02283e322733e0c2dPatch
• https://git.kernel.org/stable/c/bf364b0f10b27679140699821f88af7f01e2a6e3Patch
• https://git.kernel.org/stable/c/c297a4e65c50a2b807d9309b22615080faffa8f3Patch
• https://git.kernel.org/stable/c/da23be77e1292cd611e736c3aa17da633d7ddce7Patch

Published

Jun 25, 2026

Last Modified

Jul 6, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2026-53178In the Linux kernel, the following vulnerability has been re…8.1
• CVE-2026-53179In the Linux kernel, the following vulnerability has been re…7.1
• CVE-2026-5318A weakness has been identified in LibRaw up to 0.22.0. This …4.3
• CVE-2026-53180In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-53181In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2026-53182In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-53184In the Linux kernel, the following vulnerability has been re…7.5
• CVE-2026-53185In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2026-53186In the Linux kernel, the following vulnerability has been re…9.1
• CVE-2026-53187In the Linux kernel, the following vulnerability has been re…7.1
• CVE-2026-53188In the Linux kernel, the following vulnerability has been re…8.8
• CVE-2026-53189In the Linux kernel, the following vulnerability has been re…7.8