#VU63746 Security features bypass in AMD products - CVE-2021-26382

Vulnerability identifier: #VU63746

Vulnerability risk: Low

CVSSv4.0: 4 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-26382

CWE-ID: CWE-254

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
AMD Ryzen 5000 Series Desktop processor with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 3000 Series Mobile processor with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 5000 Series Mobile processor with Radeon graphics
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 missing verification of the signing key when processing ACP firmware images. A local privileged user can load any legitimately signed firmware image into the Audio Co-Processor (ACP) irrespective of the respective signing key being declared as usable for authenticating an ACP firmware image, and perform a denial of service (DoS) attack.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

AMD Ryzen 5000 Series Desktop processor with Radeon graphics: All versions

AMD Ryzen 3000 Series Mobile processor with Radeon graphics: All versions

AMD Ryzen 5000 Series Mobile processor with Radeon graphics: All versions

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

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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.