System hang via stale ATS invalidation retry
Published Apr 17, 2024 · Updated May 12, 2026
Denial of service in affected Linux kernel releases allows local users to hang systems by hot-resetting a PCIe endpoint. During device removal, the Intel VT-d teardown path sends an ATS device-TLB invalidation to the disconnected endpoint and retries indefinitely after an ITE fault. Exploitation requires a hotplug-capable PCIe port, link-control access, and Intel VT-d with ATS; the resulting interrupt-context loop causes a hard lockup and kernel panic.
Summary
What happened
Denial of service in affected Linux kernel releases allows local users to hang systems by hot-resetting a PCIe endpoint. During device removal, the Intel VT-d teardown path sends an ATS device-TLB invalidation to the disconnected endpoint and retries indefinitely after an ITE fault. Exploitation requires a hotplug-capable PCIe port, link-control access, and Intel VT-d with ATS; the resulting interrupt-context loop causes a hard lockup and kernel panic.
The record
- CVE
- CVE-2024-26891
- Published
- Apr 17, 2024
- Updated
- May 12, 2026
- Vendor
- Siemens
- Product
- SIMATIC S7-1500 TM MFP - GNU/Linux subsystem
- Classifications
- CWE-20, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Apr 17, 2024CVE publishedPublication date reported by the CVE source.
- May 12, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=0 <*
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
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Your stack
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