CVE-2024-36899

Spurious GPIO events via notifier teardown race

Published May 30, 2024 · Updated May 12, 2026

Use-after-free in Linux GPIO character devices allows local users to generate a spurious line event during concurrent device teardown. gpio_chrdev_release frees watched_lines before lineinfo_changed_nb finishes unregistering, so lineinfo_changed_notify can call test_bit on the freed bitmap. The race requires a device close to overlap a GPIO line release; Siemens also identifies its SIMATIC S7-1500 TM MFP GNU/Linux subsystem as affected, while userspace cannot read the resulting event after the close.

CVSS severity7.0
High
EPSS probability0.18%
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 GPIO character devices allows local users to generate a spurious line event during concurrent device teardown. gpio_chrdev_release frees watched_lines before lineinfo_changed_nb finishes unregistering, so lineinfo_changed_notify can call test_bit on the freed bitmap. The race requires a device close to overlap a GPIO line release; Siemens also identifies its SIMATIC S7-1500 TM MFP GNU/Linux subsystem as affected, while userspace cannot read the resulting event after the close.

The record

CVE
CVE-2024-36899
Published
May 30, 2024
Updated
May 12, 2026
Vendor
Siemens
Product
SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
Classifications
CWE-362, CWE-416
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 30, 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 privilegesauthenticated

What is affected?

Siemens · SIMATIC S7-1500 TM MFP - GNU/Linux subsystemversion=0 <*
The Linux Kernel Organization · Linuxversion=51c1064e82e77b39a49889287ca50709303e2f26 <02f6b0e1ec7e0e7d059dddc893645816552039da; version=51c1064e82e77b39a49889287ca50709303e2f26 <2d008d4961b039d2edce8976289773961b7e5fb5; version=51c1064e82e77b39a49889287ca50709303e2f26 <2dfbb920a89bdc58087672ad5325dc6c588b6860; version=51c1064e82e77b39a49889287ca50709303e2f26 <95ca7c90eaf5ea8a8460536535101e3e81160e2a; version=51c1064e82e77b39a49889287ca50709303e2f26 <ca710b5f40b8b16fdcad50bebd47f50e4c62d239; version=51c1064e82e77b39a49889287ca50709303e2f26 <d38c49f7bdf14381270736299e2ff68ec248a017; version=5.7

Published CVSS scores

7.0Siemens ProductCERTCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0NIST NVDCVSS:3.1/AV:L/AC:H/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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')
CWE-416Use After Free

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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