TOCTOU Vulnerability in BIOS2PSP Command Affecting AMD Products
CVE-2021-46792

5.9MEDIUM

Key Information:

Vendor
Amd
Status
Ryzen™ 2000 Series Desktop Processors “raven Ridge” Am4
Ryzen™ 5000 Series Desktop Processor With Radeon™ Graphics “cezanne” Am4
Athlon™ 3000 Series Mobile Processors With Radeon™ Graphics “dali”/”dali” Ulp
Ryzen™ 2000 Series Mobile Processors “raven Ridge” Fp5
Vendor
CVE Published:
9 May 2023

Summary

The BIOS2PSP command in certain AMD products contains a time-of-check time-of-use (TOCTOU) vulnerability. This issue arises when an attacker with administrative access exploits a malicious BIOS, creating a race condition that triggers out-of-bounds SRAM reads by the ASP bootloader during an S3 resume event. Such behavior may lead to instability or unexpected failures in device operations, resulting in a denial of service. Users are advised to follow vendor security advisories to mitigate potential risks.

Affected Version(s)

Athlon™ 3000 Series Mobile Processors with Radeon™ Graphics “Dali”/”Dali” ULP x86 various

Ryzen™ 2000 series Desktop Processors “Raven Ridge” AM4 x86 various

Ryzen™ 2000 Series Mobile Processors “Raven Ridge” FP5 x86 various

References

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

CVSS V3.1

Score:
5.9
Severity:
MEDIUM
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.