Service interruption via leaked SysHub mappings
Published May 9, 2023 · Updated Jan 28, 2025
Resource exhaustion in the AMD Secure Processor bootloader on affected Ryzen and Threadripper processors allows attackers to interrupt service. Error paths leave certain SysHub mappings allocated instead of unmapping them, allowing a malicious bootloader to consume the finite mapping resources. Exploitation requires control of a malicious bootloader; the reported consequence is denial of service without confidentiality or integrity impact.
Summary
What happened
Resource exhaustion in the AMD Secure Processor bootloader on affected Ryzen and Threadripper processors allows attackers to interrupt service. Error paths leave certain SysHub mappings allocated instead of unmapping them, allowing a malicious bootloader to consume the finite mapping resources. Exploitation requires control of a malicious bootloader; the reported consequence is denial of service without confidentiality or integrity impact.
The record
- CVE
- CVE-2021-46755
- Published
- May 9, 2023
- Updated
- Jan 28, 2025
- Vendor
- AMD
- Product
- Ryzen 5000 Series Mobile Processors with Radeon Graphics (Lucienne)
- Classifications
- T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 9, 2023CVE publishedPublication date reported by the CVE source.
- Jan 28, 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?
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
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Technologies
Your stack
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Your stack
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