#VU63737 Input validation error in AMD products - CVE-2021-26337

Vulnerability identifier: #VU63737

Vulnerability risk: Low

CVSSv4.0: 4.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-26337

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
3rd Gen AMD Ryzen Threadripper processors
Hardware solutions / Firmware
AMD Ryzen Threadripper PRO processors
Hardware solutions / Firmware

Vendor: AMD

Description

The vulnerability allows a local user to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient DRAM address validation in System Management Unit (SMU). A local user can force DMA to read from invalid DRAM address to SRAM and perform a denial of service (DoS) attack.

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

3rd Gen AMD Ryzen Threadripper processors: All versions

AMD Ryzen Threadripper PRO processors: 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.