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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
f3589be0c420a3137e5902d15705ced6a36f3f43 to < bf364b0f10b27679140699821f88af7f01e2a6e3affectedf3589be0c420a3137e5902d15705ced6a36f3f43 to < b1fd13074f22105deec45aa02283e322733e0c2daffectedf3589be0c420a3137e5902d15705ced6a36f3f43 to < aa3861f40ac32706d9e97bfac76984613e278788affectedf3589be0c420a3137e5902d15705ced6a36f3f43 to < 653245266913f03fcf21cbca68eed5c197a33e52affectedf3589be0c420a3137e5902d15705ced6a36f3f43 to < c297a4e65c50a2b807d9309b22615080faffa8f3affectedf3589be0c420a3137e5902d15705ced6a36f3f43 to < da23be77e1292cd611e736c3aa17da633d7ddce7affected
Linux Linux
Default version status: affected
5.19affected0 to < 5.19unaffected6.1.176 to ≤ 6.1.*unaffected6.6.143 to ≤ 6.6.*unaffected6.12.94 to ≤ 6.12.*unaffected6.18.36 to ≤ 6.18.*unaffected7.0.13 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/bf364b0f10b27679140699821f88af7f01e2a6e3 ↗
- https://git.kernel.org/stable/c/b1fd13074f22105deec45aa02283e322733e0c2d ↗
- https://git.kernel.org/stable/c/aa3861f40ac32706d9e97bfac76984613e278788 ↗
- https://git.kernel.org/stable/c/653245266913f03fcf21cbca68eed5c197a33e52 ↗
- https://git.kernel.org/stable/c/c297a4e65c50a2b807d9309b22615080faffa8f3 ↗
- https://git.kernel.org/stable/c/da23be77e1292cd611e736c3aa17da633d7ddce7 ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗