CVE-2024-57951

Kernel compromise via stale hrtimer hotplug state

Published Feb 12, 2025 · Updated May 23, 2026

Use-after-free in Linux kernel hrtimers allows local users to compromise kernel data or crash the system through CPU hotplug. A reversed partial CPU-offline transition leaves cpu_base.hres_active and cpu_base.online stale because no startup callback reinitializes per-CPU hrtimer state, leaving dangling pointers when the CPU returns online. Reaching the flaw requires local access and reversal after CPUHP_HRTIMERS_PREPARE; consequences include incorrect timer scheduling, dangling-pointer access, and system interruption.

CVSS severity7.8
High
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux kernel hrtimers allows local users to compromise kernel data or crash the system through CPU hotplug. A reversed partial CPU-offline transition leaves cpu_base.hres_active and cpu_base.online stale because no startup callback reinitializes per-CPU hrtimer state, leaving dangling pointers when the CPU returns online. Reaching the flaw requires local access and reversal after CPUHP_HRTIMERS_PREPARE; consequences include incorrect timer scheduling, dangling-pointer access, and system interruption.

The record

CVE
CVE-2024-57951
Published
Feb 12, 2025
Updated
May 23, 2026
Vendor
Siemens
Product
SCALANCE XC-300/XR-300/XC-400/XR-500WG/XR-500 family
Classifications
CWE-416, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 12, 2025CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=4.19.302 <4.20; version=5.10.204 <5.10.234; version=5.15.143 <5.15.177; version=53f408cad05bb987af860af22f4151e5a18e6ee8 <a5cbbea145b400e40540c34816d16d36e0374fbc; version=5.4.264 <5.4.290; version=54d0d83a53508d687fd4a225f8aa1f18559562d0 <95e4f62df23f4df1ce6ef897d44b8e23c260921a; version=5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94 <2f8dea1692eef2b7ba6a256246ed82c365fdc686; version=5c0930ccaad5a74d74e8b18b648c5eb21ed2fe94 <38492f6ee883c7b1d33338bf531a62cff69b4b28; version=6.1.68 <6.1.127; version=6.6.7 <6.6.74; version=6.7; version=6fcbcc6c8e52650749692c7613cbe71bf601670d <15b453db41d36184cf0ccc21e7df624014ab6a1a; version=75b5016ce325f1ef9c63e5398a1064cf8a7a7354 <3d41dbf82e10c44e53ea602398ab002baec27e75; version=7f4c89400d2997939f6971c7981cc780a219e36b <14984139f1f2768883332965db566ef26db609e7; version=9a2fc41acb69dd4e2a58d0c04346c3333c2341fc
Siemens · SCALANCE XCM/XRM/XCH/XRH-300 familyversion=0 <V3.2
Siemens · RUGGEDCOM RST2428Pversion=0 <V3.2

Published CVSS scores

7.8CISA-ADPCVSS: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

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-416Use After Free
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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