Service interruption via QAT reset work race
Published Jul 10, 2024 · Updated May 23, 2026
Memory-management flaw in the Linux QAT driver allows local users to exhaust kernel memory or trigger a use-after-free during device reset. The ADF_DEV_RESET_SYNC path uses completion_done as a lifetime test before asynchronous reset work has necessarily been canceled, so reset data can remain allocated or be freed while work still references it. Exploitation requires local low-privileged access and an Intel QAT device using synchronous reset; repeated leaks can exhaust memory, while the race can crash the kernel.
Summary
What happened
Memory-management flaw in the Linux QAT driver allows local users to exhaust kernel memory or trigger a use-after-free during device reset. The ADF_DEV_RESET_SYNC path uses completion_done as a lifetime test before asynchronous reset work has necessarily been canceled, so reset data can remain allocated or be freed while work still references it. Exploitation requires local low-privileged access and an Intel QAT device using synchronous reset; repeated leaks can exhaust memory, while the race can crash the kernel.
The record
- CVE
- CVE-2024-39493
- Published
- Jul 10, 2024
- Updated
- May 23, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-401, T1499.004
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jul 10, 2024CVE publishedPublication date reported by the CVE source.
- May 23, 2026Record updatedLatest update available in the CVE record.
Exploitability
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- Affected versionversion=0 <*
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Published CVSS scores
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Attacks
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Technologies
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Your stack
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