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Vulnerabilities CVE-2026-63867

CVE-2026-63867

None
Open
TLP:CLEAR

mptcp: close TOCTOU race while computing rcv_wnd

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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.

Details

EPSS Score
0.32%

24.8th percentile

Confidence
90%
Published
Jul 19, 2026
Last Modified
Jul 19, 2026
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