Information disclosure in AMD CPUs

1) Information disclosure

EUVDB-ID: #VU61566

Risk: Low

CVSSv4.0: 1.9 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Clear]

CVE-ID: CVE-2021-26401

CWE-ID: CWE-200 - Information exposure

Exploit availability: No

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

CPE2.3

• cpe:2.3:h:amd:1st_gen_amd_epyc_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:2nd_gen_amd_epyc_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:3rd_gen_amd_epyc_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_2000_series_desktop_processor:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_3000_series_desktop_processor:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_5000_series_desktop_processor:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_4000_series_desktop_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_5000_series_desktop_processor_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:2nd_gen_amd_ryzen_threadripper_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:3rd_gen_amd_ryzen_threadripper_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_threadripper_pro_processors:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_athlon_3000_series_mobile_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_2000_series_mobile_processor:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_3000_series_mobile_processor:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:2nd_gen_amd_ryzen_mobile_processor_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_3000_series_mobile_processor_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_4000_series_mobile_processors_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_ryzen_5000_series_mobile_processor_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_athlon_3000_series_mobile_processor_with_radeon_graphics:*:*:*:*:*:*:*:*
• cpe:2.3:h:amd:amd_athlon_mobile_processor_with_radeon_graphics:*:*:*:*:*:*:*:*

External links

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

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.