CVE-2026-63867
Description
In the Linux kernel, the following vulnerability has been resolved:
mptcp: close TOCTOU race while computing rcv_wnd
The MPTCP output path access locklessly the MPTCP-level ack_seq
in multiple times, using possibly different values for the data_ack
in the DSS option and to compute the announced rcv wnd for the same
packet.
Refactor the cote to avoid inconsistencies which may confuse the
peer. Also ensure that the MPTCP level rcv wnd is updated only when
the egress packet actually contains a DSS ack.
Metadata
Severity & Metrics
No CVSS data available.
Affected products (2)
| Vendor | Product | Platform | Versions |
|---|---|---|---|
| Linux | Linux | — | fa3fe2b150316b294f2c662653501273ff25bba8 < 301a33fd590c408a05c5df800e0cc1e6a8a2f8f8, fa3fe2b150316b294f2c662653501273ff25bba8 < 68364963e5baf03f16b4420292291f75c8f66497, fa3fe2b150316b294f2c662653501273ff25bba8 < 907ac6b1658e0277f979fcdfae2a753b495c1510, fa3fe2b150316b294f2c662653501273ff25bba8 < c4f4cf60797974873dbc8e100144682a6f2f861f … |
| Linux | Linux | — | 5.11, 0 < 5.11, 5.15.210 ≤ 5.15.*, 6.1.176 ≤ 6.1.* … |
References (7)
- https://git.kernel.org/stable/c/301a33fd590c408a05c5df800e0cc1e6a8a2f8f8
- https://git.kernel.org/stable/c/68364963e5baf03f16b4420292291f75c8f66497
- https://git.kernel.org/stable/c/907ac6b1658e0277f979fcdfae2a753b495c1510
- https://git.kernel.org/stable/c/c4f4cf60797974873dbc8e100144682a6f2f861f
- https://git.kernel.org/stable/c/3b8cbba7c0ed31189c89f90be247b8973ffa79ef
- https://git.kernel.org/stable/c/8f4f0a157e8436a05bf8c3670b24dbc258911c43
- https://git.kernel.org/stable/c/8ab24fdebc369c0dfb90f82c1650b1e66662bb45