CVE-2024-47696Network attack vector

Remote system hang via reclaim-unsafe workqueue flush

Published Oct 21, 2024 · Updated Aug 5, 2026

Denial of service in Linux kernel RDMA/iwcm allows remote attackers to hang systems through unauthenticated iWARP traffic. iwcm_wq is allocated without WQ_MEM_RECLAIM, yet CM ID destruction flushes it from a reclaim-capable workqueue, breaking forward progress. Reachability requires an in-kernel NVMe-oF target over iWARP or a comparable RDMA path, and the result is a kernel warning, panic, or deadlock rather than data access.

CVSS severity7.5
High
EPSS probability0.73%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Linux kernel RDMA/iwcm allows remote attackers to hang systems through unauthenticated iWARP traffic. iwcm_wq is allocated without WQ_MEM_RECLAIM, yet CM ID destruction flushes it from a reclaim-capable workqueue, breaking forward progress. Reachability requires an in-kernel NVMe-oF target over iWARP or a comparable RDMA path, and the result is a kernel warning, panic, or deadlock rather than data access.

The record

CVE
CVE-2024-47696
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
Siemens
Product
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Classifications
CWE-416, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 21, 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=4.19.320 <4.19.323; version=5.10.224 <5.10.227; version=5.15.165 <5.15.168; version=5.4.282 <5.4.285; version=557d035fe88d78dd51664f4dc0e1896c04c97cf6 <da0392698c62397c19deb1b9e9bdf2fbb5a9420e; version=6.10.3 <6.10.13; version=6.11; version=6.1.103 <6.1.113; version=6.6.44 <6.6.54; version=7f25f296fc9bd0435be14e89bf657cd615a23574 <29b3bbd912b8db86df7a3c180b910ccb621f5635; version=94ee7ff99b87435ec63211f632918dc7f44dac79 <2efe8da2ddbf873385b4bc55366d09350b408df6; version=aee2424246f9f1dadc33faa78990c1e2eb7826e4 <86dfdd8288907f03c18b7fb462e0e232c4f98d89; version=aee2424246f9f1dadc33faa78990c1e2eb7826e4 <a09dc967b3c58899e259c0aea092f421d22a0b04; version=d91d253c87fd1efece521ff2612078a35af673c6 <da2708a19f45b4a7278adf523837c8db21d1e2b5; version=dc8074b8901caabb97c2d353abd6b4e7fa5a59a5 <a64f30db12bdc937c5108158d98c8eab1925c548; version=ee39384ee787e86e9db4efb843818ef0ea9cb8ae <c8b18a75282cfd27822a8cc3c1f005c1ac8d1a58; version=ff5bbbdee08287d75d72e65b72a2b76d9637892a <8b7df76356d098f85f3bd2c7cf6fb43f531893d7
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5Linux kernel CNACVSS:3.1/AV:N/AC:L/PR:N/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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1499Endpoint Denial of Service

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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