Vulnerability identifier: #VU61566

Vulnerability risk: Low

CVSSv3.1: 4.9 [CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-26401

CWE-ID: CWE-200

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
1st Gen AMD EPYC Processors
Hardware solutions / Firmware
2nd Gen AMD EPYC Processors
Hardware solutions / Firmware
3rd Gen AMD EPYC Processors
Hardware solutions / Firmware
AMD Ryzen 2000 series Desktop processor
Hardware solutions / Firmware
AMD Ryzen 3000 Series Desktop processor
Hardware solutions / Firmware
AMD Ryzen 5000 Series Desktop processor
Hardware solutions / Firmware
AMD Ryzen 4000 Series Desktop processors with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 5000 Series Desktop processor with Radeon graphics
Hardware solutions / Firmware
2nd Gen AMD Ryzen Threadripper processors
Hardware solutions / Firmware
3rd Gen AMD Ryzen Threadripper processors
Hardware solutions / Firmware
AMD Ryzen Threadripper PRO processors
Hardware solutions / Firmware
AMD Athlon 3000 Series Mobile processors with Radeon Graphics
Hardware solutions / Firmware
AMD Ryzen 2000 Series Mobile processor
Hardware solutions / Firmware
AMD Ryzen 3000 Series Mobile processor
Hardware solutions / Firmware
2nd Gen AMD Ryzen Mobile processor with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 3000 Series Mobile processor with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 4000 Series Mobile processors with Radeon graphics
Hardware solutions / Firmware
AMD Ryzen 5000 Series Mobile processor with Radeon graphics
Hardware solutions / Firmware
AMD Athlon 3000 Series Mobile processor with Radeon graphics
Hardware solutions / Firmware
AMD Athlon Mobile processor with Radeon graphics
Hardware solutions / Firmware

Vendor: AMD

Description

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

The vulnerability exists due to excessive data output by the application within LFENCE/JMP. A local user can gain unauthorized access to sensitive information on the system.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

1st Gen AMD EPYC Processors: All versions

2nd Gen AMD EPYC Processors: All versions

3rd Gen AMD EPYC Processors: All versions

AMD Ryzen 2000 series Desktop processor: All versions

AMD Ryzen 3000 Series Desktop processor: All versions

AMD Ryzen 5000 Series Desktop processor: All versions

AMD Ryzen 4000 Series Desktop processors with Radeon graphics: All versions

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

2nd Gen AMD Ryzen Threadripper processors: All versions

3rd Gen AMD Ryzen Threadripper processors: All versions

AMD Ryzen Threadripper PRO processors: All versions

AMD Athlon 3000 Series Mobile processors with Radeon Graphics: All versions

AMD Ryzen 2000 Series Mobile processor: All versions

AMD Ryzen 3000 Series Mobile processor: All versions

2nd Gen AMD Ryzen Mobile processor with Radeon graphics: All versions

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

AMD Ryzen 4000 Series Mobile processors with Radeon graphics: All versions

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

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

AMD Athlon Mobile processor with Radeon graphics: All versions

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External links
http://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1036
http://www.openwall.com/lists/oss-security/2022/03/18/2

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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.