CVE-2022-4128

System crash via unsafe MPTCP subflow traversal

Published Nov 28, 2022 · Updated Apr 14, 2025

NULL pointer dereference in the Linux Kernel before 5.19 allows local users to crash the system during an MPTCP disconnect. The mptcp_disconnect function closes subflows with a non-safe list iterator; certain closes remove the current entry and invalidate traversal. Low-privileged local access sufficient to exercise MPTCP socket disconnects can trigger a kernel crash, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL pointer dereference in the Linux Kernel before 5.19 allows local users to crash the system during an MPTCP disconnect. The mptcp_disconnect function closes subflows with a non-safe list iterator; certain closes remove the current entry and invalidate traversal. Low-privileged local access sufficient to exercise MPTCP socket disconnects can trigger a kernel crash, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2022-4128
Published
Nov 28, 2022
Updated
Apr 14, 2025
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 28, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 14, 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=Fixed in 5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=Fixed in 5.19

Published CVSS scores

5.5NVDCVSS: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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
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

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Your stack

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