#VU63728 Input validation error in AMD Ryzen 3000 Series Desktop processor and AMD Ryzen 5000 Series Desktop processor - CVE-2021-26335

Vulnerability identifier: #VU63728

Vulnerability risk: Low

CVSSv4.0: 5.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-26335

CWE-ID: CWE-20

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
AMD Ryzen 3000 Series Desktop processor
Hardware solutions / Firmware
AMD Ryzen 5000 Series Desktop processor
Hardware solutions / Firmware

Vendor: AMD

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in the AMD Secure Processor (ASP) boot loader image header. A local user can escalate privileges on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AMD Ryzen 3000 Series Desktop processor: All versions

AMD Ryzen 5000 Series Desktop processor: All versions

---

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

---

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.