Cross-process data disclosure via stale vector registers
Published Jul 24, 2023 · Updated Feb 13, 2025
Cross-process information disclosure in AMD Zen 2 processors allows local users to read sensitive register data from other contexts. A mispredicted VZEROUPPER instruction releases vector-register resources but fails to restore internal tracking, exposing stale YMM values. No privileges or system calls are required, and data from processes, sibling threads, sandboxes, containers, or guests sharing a physical core can be read.
Summary
What happened
Cross-process information disclosure in AMD Zen 2 processors allows local users to read sensitive register data from other contexts. A mispredicted VZEROUPPER instruction releases vector-register resources but fails to restore internal tracking, exposing stale YMM values. No privileges or system calls are required, and data from processes, sibling threads, sandboxes, containers, or guests sharing a physical core can be read.
The record
- CVE
- CVE-2023-20593
- Published
- Jul 24, 2023
- Updated
- Feb 13, 2025
- Vendor
- AMD
- Product
- Ryzen 5000 Series Mobile Processors with Radeon Graphics (Lucienne)
- Classifications
- CWE-209, CWE-1303, T1003
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 24, 2023CVE publishedPublication date reported by the CVE source.
- Feb 13, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=various
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Zenbleed proof of conceptfunctional · demonstrated
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Technologies
Your stack
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Your stack
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