Time-of-check Time-of-use (TOCTOU) Race Condition in AMD products - CVE-2021-26356

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Main Vulnerability Database Vulnerabilities #VU75925

Time-of-check Time-of-use (TOCTOU) Race Condition in AMD products - CVE-2021-26356

Published: May 9, 2023


Vulnerability identifier: #VU75925
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2021-26356
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability: No public exploit available
Vendor: AMD
Affected software:
1st Gen AMD EPYC Processors
2nd Gen AMD EPYC Processors
3rd Gen AMD EPYC Processors

Detailed vulnerability description

The vulnerability allows a local user to gain access to sensitive information.

The vulnerability exists due to a race condition in ASP bootloader. A local user can tamper with the SPI ROM, corrupt S3 data and gain access to sensitive information.


How to mitigate CVE-2021-26356

Install updates from vendor's website.

Sources