Security readout for executives and security teams
Plain-English summary
CVE-2021-26375 is an AMD processor platform issue where insufficient bounds checking around GPIO handling in the System Management Unit could allow invalid address-space access or updates, potentially causing denial of service. The public bundle does not provide a CVSS score, detailed prerequisites, or confirmed exploitation.
Executive priority
Treat as a platform reliability risk until asset matching is complete. Prioritize critical servers and shared compute environments using affected AMD families.
Technical view
The issue is described as an insufficient GPIO bounds check in AMD SMU logic. Affected families include various AMD EPYC, Ryzen, and Athlon processors. The documented impact is denial of service from invalid address-space access or updates. The bundle does not include CWE mapping, scoring, exploitability details, or patch specifics.
Likely exposure
Exposure is limited to systems using the listed AMD EPYC, Ryzen, or Athlon processor families, with exact affected models and versions requiring AMD bulletin review.
Exploitation context
The source bundle marks this CVE as not in CISA KEV and provides no cited evidence of active exploitation or public exploit availability.
Researcher notes
Available evidence is sparse: no CVSS, CWE, prerequisites, or fix details are included in the bundle. Avoid assuming exploitability beyond the stated denial-of-service impact.
Mitigation direction
- Review AMD SB-1027 and SB-1028 for affected model guidance.
- Inventory AMD EPYC, Ryzen, and Athlon systems across servers and endpoints.
- Apply only vendor-recommended platform updates or mitigations identified in AMD guidance.
- Coordinate with hardware, OEM, or managed-service owners before production rollout.
Validation and detection
- Confirm processor family and model for each potentially affected asset.
- Map discovered processors against AMD SB-1027 and SB-1028.
- Verify whether vendor-recommended updates or mitigations are present.
- Track denial-of-service incidents separately from confirmed vulnerability exposure.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-26375 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1027CVE reference · x_refsource_MISC
- https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1028CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.