CVE-2026-80586

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-80586

Key Details

CVE	CVE-2026-80586
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/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 high; integrity impact is high; availability impact is high.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

mptcp: options: reset DSS fields in case of unexpected size

A remote peer could send a malformed DSS with a wrong size, followed by

another DSS or MPC + Data. In this case, the first suboption will be

ignored, but leaving some fields written, which could lead to

inconsistency or access uninitialized data.

Explicitly reset the fields that could have been modified in case of

unexpected size. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-80586
CVE	https://www.cve.org/CVERecord?id=CVE-2026-80586

Source

Reference

NVD

CVE