Out-of-bounds bootloader memory access via malformed syscall
Published May 12, 2022 · Updated Sep 16, 2024
Out-of-bounds memory access in AMD Ryzen Series and Athlon Series bootloaders allows attackers to access memory outside expected bounds. A malformed system call from a malicious or compromised User Application or AGESA Boot Loader reaches the bootloader without adequate bounds enforcement. Exploitation requires control of a UApp or ABL; AMD does not state whether the access reads, writes, crashes, or executes code.
Summary
What happened
Out-of-bounds memory access in AMD Ryzen Series and Athlon Series bootloaders allows attackers to access memory outside expected bounds. A malformed system call from a malicious or compromised User Application or AGESA Boot Loader reaches the bootloader without adequate bounds enforcement. Exploitation requires control of a UApp or ABL; AMD does not state whether the access reads, writes, crashes, or executes code.
The record
- CVE
- CVE-2021-26369
- Published
- May 12, 2022
- Updated
- Sep 16, 2024
- Vendor
- AMD
- Product
- AMD Ryzen Series
- Classifications
- CWE-119
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- May 12, 2022CVE publishedPublication date reported by the CVE source.
- Sep 16, 2024Record 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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