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High severity7.5NVD Advisory· Published May 9, 2023· Updated Jun 17, 2026

CVE-2021-46755

CVE-2021-46755

Description

Failure to unmap certain SysHub mappings in error paths of the ASP (AMD Secure Processor) bootloader may allow an attacker with a malicious bootloader to exhaust the SysHub resources resulting in a potential denial of service.

Affected products

56
  • AMD/Ryzen™ 3000 Series Desktop Processors “Matisse” AM4v5
    Range: various
  • AMD/AMD Ryzen™ 5000 Series Desktop Processors “Vermeer” AM4v5
    Range: various
  • AMD/Ryzen™ 5000 Series Desktop processor with Radeon™ Graphics “Cezanne” AM4v5
    Range: various
  • AMD/3rd Gen AMD Ryzen™ Threadripper™ Processors “Castle Peak” HEDTv5
    Range: various
  • AMD/Ryzen™ Threadripper™ PRO Processors “Castle Peak” WSv5
    Range: various
  • AMD/Ryzen™ Threadripper™ PRO Processors “Chagall” WSv5
    Range: various
  • AMD/Ryzen™ 3000 Series Mobile Processors with Radeon™ Graphics “Renoir”v5
    Range: various
  • AMD/Ryzen™ 5000 Series Mobile Processors with Radeon™ Graphics “Lucienne”v5
    Range: various
  • AMD/Ryzen™ 5000 Series Mobile processors with Radeon™ Graphics “Cezanne”v5
    Range: various
  • AMD/Ryzen 5500 Firmware2 versions
    cpe:2.3:o:amd:ryzen_5500_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5500_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5500_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5600 Firmware2 versions
    cpe:2.3:o:amd:ryzen_5600_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5600_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5600_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5600g Firmware2 versions
    cpe:2.3:o:amd:ryzen_5600g_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5600g_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5600g_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5600x Firmware2 versions
    cpe:2.3:o:amd:ryzen_5600x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5600x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5600x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5700g Firmware2 versions
    cpe:2.3:o:amd:ryzen_5700g_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5700g_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5700g_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5700x Firmware2 versions
    cpe:2.3:o:amd:ryzen_5700x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5700x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5700x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5800x3d Firmware2 versions
    cpe:2.3:o:amd:ryzen_5800x3d_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5800x3d_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5800x3d_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5800x Firmware2 versions
    cpe:2.3:o:amd:ryzen_5800x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5800x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5800x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5900x Firmware2 versions
    cpe:2.3:o:amd:ryzen_5900x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5900x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5900x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 5950x Firmware2 versions
    cpe:2.3:o:amd:ryzen_5950x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_5950x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_5950x_firmware:comboam4v2_pi_1.2.0.6:*:*:*:*:*:*:*
  • AMD/Ryzen 3100 Firmware2 versions
    cpe:2.3:o:amd:ryzen_3100_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3100_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3100_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3300x Firmware2 versions
    cpe:2.3:o:amd:ryzen_3300x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3300x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3300x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3500 Firmware2 versions
    cpe:2.3:o:amd:ryzen_3500_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3500_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3500_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3500x Firmware2 versions
    cpe:2.3:o:amd:ryzen_3500x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3500x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3500x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3600 Firmware2 versions
    cpe:2.3:o:amd:ryzen_3600_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3600_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3600_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3600x Firmware2 versions
    cpe:2.3:o:amd:ryzen_3600x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3600x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3600x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3600xt Firmware2 versions
    cpe:2.3:o:amd:ryzen_3600xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3600xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3600xt_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3800x Firmware2 versions
    cpe:2.3:o:amd:ryzen_3800x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3800x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3800x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3800xt Firmware2 versions
    cpe:2.3:o:amd:ryzen_3800xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3800xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3800xt_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3900 Firmware2 versions
    cpe:2.3:o:amd:ryzen_3900_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3900_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3900_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3900x Firmware2 versions
    cpe:2.3:o:amd:ryzen_3900x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3900x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3900x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3900xt Firmware2 versions
    cpe:2.3:o:amd:ryzen_3900xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3900xt_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3900xt_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Ryzen 3950x Firmware2 versions
    cpe:2.3:o:amd:ryzen_3950x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*+ 1 more
    • cpe:2.3:o:amd:ryzen_3950x_firmware:comboam4_v2_pi_1.2.0.8:*:*:*:*:*:*:*
    • cpe:2.3:o:amd:ryzen_3950x_firmware:comboam4pi_1.0.0.9:*:*:*:*:*:*:*
  • AMD/Secure Processor (ASP) Boot Loaderllm-fuzzy

Patches

Vulnerability mechanics

References

1

News mentions

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