← All Advisories
Reported from OT-Advisories.com as of

CVE-2026-63867

Last refreshed2026-10-17

Status: UPDATED  |  Advisory ID: CVE-2026-63867

Key Details

CVECVE-2026-63867
CVSS Score / Version
8.2 (High) / CVSS v3.1
Updated2026-10-16
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H
CVSS Prose
attack vector is network; attack complexity is low; privileges required is none; user interaction is none; scope is unchanged; confidentiality impact is none; integrity impact is low; availability impact is high.
Affected products
Linux Kernel

Affected Products, Subsystems & Sectors

VendorProductAffected VersionsPatch Status
LinuxLinux Kernel
SubsystemsOT Supporting Infrastructure
SectorsAll Sectors

What to Know

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. (NVD)

What to Do

Monitor Linux's web page for any future patch releases.

References

SourceReference
NVDhttps://nvd.nist.gov/vuln/detail/CVE-2026-63867
CVEhttps://www.cve.org/CVERecord?id=CVE-2026-63867

About

OT-Advisories  ·  CVE  ·  NVD  ·  CVSS  ·  KEV  ·  EPSS  ·  CWE
Report compilation © 2026 OT-Advisories.com  ·  CC BY 4.0  ·  Source materials remain the property of their respective publishers as cited.