Input validation error in AMD products - CVE-2021-26362

Vulnerability identifier: #VU63742

CSH Severity: Low

CVSS v4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear

CVE-ID: CVE-2021-26362

CWE-ID: CWE-20

Exploitation vector: Local access

Exploit availability: No public exploit available

Vendor: AMD

Affected software:
AMD Ryzen 2000 series Desktop processor
AMD Ryzen 5000 Series Desktop processor with Radeon graphics
2nd Gen AMD Ryzen Threadripper processors
AMD Ryzen 2000 Series Mobile processor
AMD Ryzen 3000 Series Mobile processor
2nd Gen AMD Ryzen Mobile processor with Radeon graphics
AMD Athlon 3000 Series Mobile processors with Radeon Graphics
AMD Ryzen 3000 Series Mobile processor with Radeon graphics
AMD Ryzen 5000 Series Mobile processor with Radeon graphics

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to insufficient validation of user-supplied input. A malicious or compromised UApp or ABL can issue a malformed system call, which results in mapping sensitive System Management Network (SMN) registers, and escalate privileges on the system.

Install updates from vendor's website.

• https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027