Epyc 7763 Firmware
CVE-2021-26338
HIGH
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Primary rating from NVD · only source for this CVE.
CVSS VectorNVD
Lifecycle Timeline
1DescriptionNVD
Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources.
AnalysisAI
Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources. Rated high severity (CVSS 7.5), this vulnerability is remotely exploitable, no authentication required, low attack complexity. No vendor patch available.
Technical ContextAI
This vulnerability is classified under CWE-284. Improper access controls in System Management Unit (SMU) may allow for an attacker to override performance control tables located in DRAM resulting in a potential lack of system resources. Affected products include: Amd Epyc 7F72 Firmware, Amd Epyc 7F52 Firmware, Amd Epyc 7F32 Firmware, Amd Epyc 7H12 Firmware, Amd Epyc 7742 Firmware.
RemediationAI
No vendor patch is available at time of analysis. Monitor vendor advisories for updates. Apply vendor patches when available. Implement network segmentation and monitoring as interim mitigations.
More in Epyc 7763 Firmware
View allImproper access control settings in ASP Bootloader may allow an attacker to corrupt the return address causing a stack-b
A side channel vulnerability on some of the AMD CPUs may allow an attacker to influence the return address prediction. R
A malicious hypervisor in conjunction with an unprivileged attacker process inside an SEV/SEV-ES guest VM may fail to fl
Improper restriction of write operations in SNP firmware could allow a malicious hypervisor to potentially overwrite a g
Improper input validation in SEV-SNP could allow a malicious hypervisor to read or overwrite guest memory potentially le
Improper input and range checking in the AMD Secure Processor (ASP) boot loader image header may allow an attacker to us
AMD System Management Unit (SMU) contains a potential issue where a malicious user may be able to manipulate mailbox ent
Failure to validate SEV Commands while SNP is active may result in a potential impact to memory integrity. Rated high se
When the AMD Platform Security Processor (PSP) boot rom loads, authenticates, and subsequently decrypts an encrypted FW,
Failure to validate VM_HSAVE_PA during SNP_INIT may result in a loss of memory integrity. Rated high severity (CVSS 7.8)
Improper address validation in ASP with SNP enabled may potentially allow an attacker to compromise guest memory integri
Insufficient DRAM address validation in System Management Unit (SMU) may allow an attacker to read/write from/to an inva
Same weakness CWE-284 – Improper Access Control
View allSame technique Authentication Bypass
View allShare
External POC / Exploit Code
Leaving vuln.today