Local stale-data disclosure via oversized MMIO reads
Published Jun 15, 2022 · Updated May 5, 2025
Incomplete buffer cleanup in some Intel Processors allows local users to disclose stale data through oversized MMIO reads. A read wider than four bytes can return unrequested stale data from a shared transaction buffer directly into architectural state. Exploitation requires local authenticated code with MMIO access, including an untrusted guest granted MMIO, and can expose data handled by another core.
Summary
What happened
Incomplete buffer cleanup in some Intel Processors allows local users to disclose stale data through oversized MMIO reads. A read wider than four bytes can return unrequested stale data from a shared transaction buffer directly into architectural state. Exploitation requires local authenticated code with MMIO access, including an untrusted guest granted MMIO, and can expose data handled by another core.
The record
- CVE
- CVE-2022-21123
- Published
- Jun 15, 2022
- Updated
- May 5, 2025
- Vendor
- Topcon Positioning Systems, Inc.
- Product
- Intel Processors
- Classifications
- CWE-459, T1005
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 15, 2022CVE publishedPublication date reported by the CVE source.
- May 5, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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- Affected versionversion=See references
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Public exploit references
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Technologies
Your stack
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Your stack
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