CVE-2024-50095Network attack vector

System hang via RDMA timeout lock contention

Published Nov 5, 2024 · Updated Aug 5, 2026

Improper locking in Linux kernel RDMA MAD handling allows remote attackers to hang an RDMA node by flooding connection requests. The timeout_sends handler repeatedly releases and reacquires mad_agent_priv for every expired work request, causing severe contention when many requests expire together. Reachability requires an RDMA CM listener over an exposed IB or RoCE interface; the bounded consequence is a CPU soft lockup and service interruption.

CVSS severity7.5
High
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux kernel RDMA MAD handling allows remote attackers to hang an RDMA node by flooding connection requests. The timeout_sends handler repeatedly releases and reacquires mad_agent_priv for every expired work request, causing severe contention when many requests expire together. Reachability requires an RDMA CM listener over an exposed IB or RoCE interface; the bounded consequence is a CPU soft lockup and service interruption.

The record

CVE
CVE-2024-50095
Published
Nov 5, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Classifications
CWE-667, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Nov 5, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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 <V3.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Siemens · SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 familyversion=0 <V3.2
Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2a777679b8ccd09a9a65ea0716ef10365179caac; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3e799fa463508abe7a738ce5d0f62a8dfd05262a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <7022a517bf1ca37ef5a474365bcc5eafd345a13a; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <713adaf0ecfc49405f6e5d9e409d984f628de818; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a195a42dd25ca4f12489687065d00be64939409f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e80eadb3604a92d2d086e956b8b2692b699d4d0a; version=2.6.12
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2

Published CVSS scores

7.5Linux Kernel CNACVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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

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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
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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