CVE-2025-71144

Local denial of service via stale MPTCP context

Published Jan 14, 2026 · Updated Jan 14, 2026

State-management flaw in Linux Kernel MPTCP allows local users to cause a service interruption through a crafted disconnect sequence. When a subflow is already in TCP_CLOSE or has fallen back to TCP, mptcp_do_fastclose() omits the send_fastclose flag, so __mptcp_close_ssk() leaves the subflow context stale. A later connection lacks both request_mptcp and the MPTCP-socket fallback state, reaching a warning in subflow_data_ready(); low-privileged local access and MPTCP use are required, and the published impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

State-management flaw in Linux Kernel MPTCP allows local users to cause a service interruption through a crafted disconnect sequence. When a subflow is already in TCP_CLOSE or has fallen back to TCP, mptcp_do_fastclose() omits the send_fastclose flag, so __mptcp_close_ssk() leaves the subflow context stale. A later connection lacks both request_mptcp and the MPTCP-socket fallback state, reaching a warning in subflow_data_ready(); low-privileged local access and MPTCP use are required, and the published impact is limited to availability.

The record

CVE
CVE-2025-71144
Published
Jan 14, 2026
Updated
Jan 14, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3a13454fd098ed51e733958488f8ec62859a9ed8 <5c7c7135468f3fc6379cde9777a2c18bfe92d82f
  2. Affected versionversion=6.18
  3. Affected versionversion=9ea05fabce31ff93a0adae8221c58bc6d7b832f3
  4. Affected versionversion=ae155060247be8dcae3802a95bd1bdf93ab3215d <86730ac255b0497a272704de9a1df559f5d6602e
  5. Affected versionversion=ae155060247be8dcae3802a95bd1bdf93ab3215d <f1a77dfc3b045c3dd5f6e64189b9f52b90399f07
  6. Affected versionversion=c4f7b0916b95fd2226e5ab98882482b08f52e1c0
  7. Affected versionversion=f6fb2cbc91a81178dea23d463503b4525a76825d <1c7c3a9314d8a7fc0e9a508606466a967c8e774a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3a13454fd098ed51e733958488f8ec62859a9ed8 <5c7c7135468f3fc6379cde9777a2c18bfe92d82f; version=6.18; version=9ea05fabce31ff93a0adae8221c58bc6d7b832f3; version=ae155060247be8dcae3802a95bd1bdf93ab3215d <86730ac255b0497a272704de9a1df559f5d6602e; version=ae155060247be8dcae3802a95bd1bdf93ab3215d <f1a77dfc3b045c3dd5f6e64189b9f52b90399f07; version=c4f7b0916b95fd2226e5ab98882482b08f52e1c0; version=f6fb2cbc91a81178dea23d463503b4525a76825d <1c7c3a9314d8a7fc0e9a508606466a967c8e774a

Published CVSS scores

5.5UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo