CVE-2023-54176

Kernel crash via stale MPTCP worker state

Published Dec 30, 2025 · Updated Dec 30, 2025

A state-handling flaw in the Linux kernel allows local users to crash the kernel through a raced sequence of MPTCP socket operations. The mptcp_worker function runs after mptcp_disconnect closes the socket, then processes a fast-close reset and reaches __tcp_select_window with invalid state, causing a divide error. Triggering the fault requires connect, an incoming reset with fast close, disconnect, and listen operations to race on the same MPTCP socket; the demonstrated consequence is service interruption.

CVSS severityUnavailable
Unscored
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A state-handling flaw in the Linux kernel allows local users to crash the kernel through a raced sequence of MPTCP socket operations. The mptcp_worker function runs after mptcp_disconnect closes the socket, then processes a fast-close reset and reaches __tcp_select_window with invalid state, causing a divide error. Triggering the fault requires connect, an incoming reset with fast close, disconnect, and listen operations to race on the same MPTCP socket; the demonstrated consequence is service interruption.

The record

CVE
CVE-2023-54176
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=5.11
  2. Affected versionversion=e16163b6e2b720fb74e5af758546f6dad27e6c9e <19ea79e87af32c2b3c6fc49bd84efeb35ca57678
  3. Affected versionversion=e16163b6e2b720fb74e5af758546f6dad27e6c9e <aff9099e9c51f15c8def05c75b2b73e8487b5d54
  4. Affected versionversion=e16163b6e2b720fb74e5af758546f6dad27e6c9e <d6a0443733434408f2cbd4c53fea6910599bab9e
  5. Affected versionversion=e16163b6e2b720fb74e5af758546f6dad27e6c9e <f0b4a4086cf27240fc621a560da9735159049dcc

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=e16163b6e2b720fb74e5af758546f6dad27e6c9e <19ea79e87af32c2b3c6fc49bd84efeb35ca57678; version=e16163b6e2b720fb74e5af758546f6dad27e6c9e <aff9099e9c51f15c8def05c75b2b73e8487b5d54; version=e16163b6e2b720fb74e5af758546f6dad27e6c9e <d6a0443733434408f2cbd4c53fea6910599bab9e; version=e16163b6e2b720fb74e5af758546f6dad27e6c9e <f0b4a4086cf27240fc621a560da9735159049dcc

Published CVSS scores

No CVSS assessment is available in this record.

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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation Flaws

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

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Your stack

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