CVE-2024-26894

Service degradation via CPU-idle device memory leak

Published Apr 17, 2024 · Updated May 12, 2026

Memory leakage in the ACPI processor-idle teardown path in affected Linux kernels allows local users to deplete kernel memory. acpi_processor_power_exit() unregisters the CPU idle device but fails to free its allocated memory, leaving an unreferenced object after teardown. Reachability requires local control over CPU-device removal; repeated teardown consumes kernel memory and can impair availability.

CVSS severity6.0
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leakage in the ACPI processor-idle teardown path in affected Linux kernels allows local users to deplete kernel memory. acpi_processor_power_exit() unregisters the CPU idle device but fails to free its allocated memory, leaving an unreferenced object after teardown. Reachability requires local control over CPU-device removal; repeated teardown consumes kernel memory and can impair availability.

The record

CVE
CVE-2024-26894
Published
Apr 17, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-770, CWE-20
Attack vector
local
Privileges
admin

Timeline

How it unfolded

  1. Apr 17, 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 <*

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=3.7; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <1cbaf4c793b0808532f4e7b40bc4be7cec2c78f2; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <3d48e5be107429ff5d824e7f2a00d1b610d36fbc; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <8d14a4d0afb49a5b8535d414c782bb334860e73e; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <c2a30c81bf3cb9033fa9f5305baf7c377075e2e5; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <cd5c2d0b09d5b6d3f0a7bbabe6761a4997e9dee9; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <d351bcadab6caa6d8ce7159ff4b77e2da35c09fa; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <e18afcb7b2a12b635ac10081f943fcf84ddacc51; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <ea96bf3f80625cddba1391a87613356b1b45716d; version=3d339dcbb56d8d70c1b959aff87d74adc3a84eea <fad9bcd4d754cc689c19dc04d2c44b82c1a5d6c8

Published CVSS scores

5.5Siemens ProductCERTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
6.0CISA-ADPCVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
CWE-20Improper Input Validation

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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