CVE-2026-63867 mptcp: close TOCTOU race while computing rcv_wnd

In the Linux kernel, the following vulnerability has been resolved: mptcp: close TOCTOU race while computing rcvwnd The MPTCP output path access locklessly the MPTCP-level ackseq in multiple times, using possibly different values for the dataack in the DSS option and to compute the announced rcv...

PT-2026-61184

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A TOCTOU Time-of-Check to Time-of-Use race condition exists in the MPTCP output path. The system accesses the MPTCP-level ack seq locklessly multiple times, which can lead to the use of...