CVE-2024-44935

Local system crash via SCTP reuseport race

Published Aug 26, 2024 · Updated May 12, 2026

A race condition in Linux kernel SCTP reuse-port handling from 5.0 allows local users to crash the system through concurrent socket operations. reuseport_add_sock() dereferences sk2->sk_reuseport_cb after a concurrent close clears it through reuseport_detach_sock() because SCTP endpoint hashing lacks group synchronization. Triggering the fault requires low-privileged local execution, SCTP listeners sharing a port with SO_REUSEPORT, and a timed listen-versus-close race.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A race condition in Linux kernel SCTP reuse-port handling from 5.0 allows local users to crash the system through concurrent socket operations. reuseport_add_sock() dereferences sk2->sk_reuseport_cb after a concurrent close clears it through reuseport_detach_sock() because SCTP endpoint hashing lacks group synchronization. Triggering the fault requires low-privileged local execution, SCTP listeners sharing a port with SO_REUSEPORT, and a timed listen-versus-close race.

The record

CVE
CVE-2024-44935
Published
Aug 26, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-476, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2024CVE publishedPublication date reported by the CVE source.
  2. May 12, 2026Record 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=0 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=5.0; version=6ba84574026792ce33a40c7da721dea36d0f3973 <05e4a0fa248240efd99a539853e844f0f0a9e6a5; version=6ba84574026792ce33a40c7da721dea36d0f3973 <1407be30fc17eff918a98e0a990c0e988f11dc84; version=6ba84574026792ce33a40c7da721dea36d0f3973 <52319d9d2f522ed939af31af70f8c3a0f0f67e6c; version=6ba84574026792ce33a40c7da721dea36d0f3973 <54b303d8f9702b8ab618c5032fae886b16356928; version=6ba84574026792ce33a40c7da721dea36d0f3973 <9ab0faa7f9ffe31296dbb9bbe6f76c72c14eea18; version=6ba84574026792ce33a40c7da721dea36d0f3973 <c9b3fc4f157867e858734e31022ebee8a24f0de7; version=6ba84574026792ce33a40c7da721dea36d0f3973 <e809a84c802377ef61525a298a1ec1728759b913
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.1
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.1

Published CVSS scores

5.5Siemens ProductCERTCVSS: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

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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
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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