CVE-2024-47735

Service interruption via mismatched IRQ locking

Published Oct 21, 2024 · Updated May 12, 2026

Improper locking in the Linux RDMA/HNS driver from 4.9 allows local users to interrupt service during queue-pair creation. In add_qp_to_list(), spin_lock_irq() and spin_unlock_irq() are nested inside a spin_lock_irqsave() section, enabling interrupts before the outer spin_unlock_irqrestore() restores state. Reachability requires local low-privileged access and the HNS RoCE v2 queue-pair path; published records do not specify whether availability loss is a hang, crash, or reboot.

CVSS severity5.5
Medium
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Improper locking in the Linux RDMA/HNS driver from 4.9 allows local users to interrupt service during queue-pair creation. In add_qp_to_list(), spin_lock_irq() and spin_unlock_irq() are nested inside a spin_lock_irqsave() section, enabling interrupts before the outer spin_unlock_irqrestore() restores state. Reachability requires local low-privileged access and the HNS RoCE v2 queue-pair path; published records do not specify whether availability loss is a hang, crash, or reboot.

The record

CVE
CVE-2024-47735
Published
Oct 21, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Classifications
CWE-667, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

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 vectorlocal
Required privilegesauthenticated

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=4.9; version=9a4435375cd151e07c0c38fa601b00115986091b <07f0f643d7e570dbe8ef6f5c3367a43e3086a335; version=9a4435375cd151e07c0c38fa601b00115986091b <094a1821903f33fb91de4b71087773ee16aeb3a0; version=9a4435375cd151e07c0c38fa601b00115986091b <2656336a84fcb6802f6e6c233f4661891deea24f; version=9a4435375cd151e07c0c38fa601b00115986091b <29c0f546d3fd66238b42cf25bcd5f193bb1cf794; version=9a4435375cd151e07c0c38fa601b00115986091b <425589d4af09c49574bd71ac31f811362a5126c3; version=9a4435375cd151e07c0c38fa601b00115986091b <74d315b5af180220d561684d15897730135733a6; version=9a4435375cd151e07c0c38fa601b00115986091b <a1a3403bb1826c8ec787f0d60c3e7b54f419129e
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5NIST NVDCVSS: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)
Vectorlocal
Privilegesauthenticated
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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo