VULNERABILITY INTELLIGENCE

CVE-2026-63867

CVSS score8.2 HIGH
EPSS probability0.27%
CISA KEVNot currently listed
Published2026-07-19
Last modified2026-10-26
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H

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.

Weakness classification

  • nvd@nist.gov: CWE-367
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-362

Primary references