Input Validation Flaw in AMD Secure Processor Bootloader
CVE-2021-46756

9.1CRITICAL

Key Information:

Vendor

Amd
Status
Ryzen™ 2000 Series Desktop Processors “raven Ridge” Am4
Ryzen™ 2000 Series Desktop Processors “pinnacle Ridge”
Ryzen™ 3000 Series Desktop Processors “matisse” Am4
Amd Ryzen™ 5000 Series Desktop Processors “vermeer” Am4
Vendor
CVE Published:
9 May 2023

What is CVE-2021-46756?

The AMD Secure Processor bootloader exhibits an insufficient validation of user inputs in the SVC_MAP_USER_STACK. This flaw permits an attacker utilizing a compromised user application (Uapp) or a malicious ABL to issue malformed system calls to the bootloader, potentially leading to a denial of service and compromising the integrity of the system.

Affected Version(s)

1st Gen AMD EPYC™ Processors x86 various

2nd Gen AMD EPYC™ Processors x86 various

2nd Gen AMD Ryzen™ Threadripper™ Processors “Colfax” x86 various

References

https://www.amd.com/en/corporate/product-security/bulleti...
vendor-advisory
https://www.amd.com/en/corporate/product-security/bulleti...
vendor-advisory

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
None
Integrity:
High
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.