Freed kernel memory access via LED trigger race
Published Aug 17, 2024 · Updated Aug 5, 2026
Use-after-free in Linux LED trigger sysfs teardown allows local users to access freed kernel memory through a race condition. The teardown path frees trigger-data in deactivate() before device_remove_groups() removes the associated sysfs show and store handlers, leaving those handlers callable against freed memory. The affected kernel is also cataloged in the SIMATIC S7-1500 TM MFP GNU/Linux subsystem; exploitation requires local access and a successful race during trigger deactivation.
Summary
What happened
Use-after-free in Linux LED trigger sysfs teardown allows local users to access freed kernel memory through a race condition. The teardown path frees trigger-data in deactivate() before device_remove_groups() removes the associated sysfs show and store handlers, leaving those handlers callable against freed memory. The affected kernel is also cataloged in the SIMATIC S7-1500 TM MFP GNU/Linux subsystem; exploitation requires local access and a successful race during trigger deactivation.
The record
- CVE
- CVE-2024-43830
- Published
- Aug 17, 2024
- Updated
- Aug 5, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-416, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 17, 2024CVE publishedPublication date reported by the CVE source.
- Aug 5, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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What is affected?
Published CVSS scores
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Attacks
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Technologies
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Your stack
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