CVE-2024-47660

Soft lockup via fsnotify watch-removal contention

Published Oct 9, 2024 · Updated May 12, 2026

Denial of service in Linux kernel fsnotify since 2.6.38 allows local users to trigger a soft lockup by removing a directory watch. __fsnotify_update_child_dentry_flags() walks numerous child dentries while holding inode->i_lock, contending with concurrent child-notification updates. A local user must create a directory with many dentries and race watch removal against child access; the resulting contention stalls kernel work.

CVSS severity4.7
Medium
EPSS probability0.16%
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 fsnotify since 2.6.38 allows local users to trigger a soft lockup by removing a directory watch. __fsnotify_update_child_dentry_flags() walks numerous child dentries while holding inode->i_lock, contending with concurrent child-notification updates. A local user must create a directory with many dentries and race watch removal against child access; the resulting contention stalls kernel work.

The record

CVE
CVE-2024-47660
Published
Oct 9, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Classifications
CWE-362, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 9, 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 <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=2.6.38; version=873feea09ebc980cbd3631b767356ce1eee65ec1 <172e422ffea20a89bfdc672741c1aad6fbb5044e; version=873feea09ebc980cbd3631b767356ce1eee65ec1 <3f3ef1d9f66b93913ce2171120d9226b55acd41d; version=873feea09ebc980cbd3631b767356ce1eee65ec1 <7ef1d2e240c32b1f337a37232d037b07e3919e1a; version=873feea09ebc980cbd3631b767356ce1eee65ec1 <d8c42405fc3507cc43ba7e4986a773c3fc633f6e; version=873feea09ebc980cbd3631b767356ce1eee65ec1 <f9a48bc3dd9099935751458a5bbbea4b7c28abc8; version=873feea09ebc980cbd3631b767356ce1eee65ec1 <fc1b1e135c3f72382f792e6c319fc088d5523ad5
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2

Published CVSS scores

4.7NIST NVDCVSS:3.1/AV:L/AC:H/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-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
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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