Security readout for executives and security teams
Plain-English summary
This issue affects various AMD EPYC processors and could let a caller trigger a denial of service through a race condition in the System Management Unit. The public bundle does not provide CVSS, exact models, patches, or exploitation evidence, so urgency depends on whether affected EPYC systems support critical services.
Executive priority
Handle as a targeted platform-firmware risk. Prioritize confirmation for EPYC systems supporting critical operations, but avoid broad emergency action until AMD or OEM guidance confirms affected status and remediation path.
Technical view
CVE-2021-26350 is a TOCTOU race condition in AMD SMU. The record says a caller may obtain and manipulate the address of a message port register, potentially causing denial of service. Affected scope is listed only as various AMD EPYC processors.
Likely exposure
Exposure is likely limited to environments running AMD EPYC processor platforms covered by AMD-SB-1028. Exact affected versions are not provided in the bundle, so asset owners must map server CPU and firmware inventory against AMD guidance.
Exploitation context
The source bundle marks CISA KEV as false and provides no cited evidence of active exploitation or public exploit use. The described impact is potential denial of service, not code execution or data disclosure.
Researcher notes
Public details are sparse: no CVSS vector, no CWE, no exact EPYC model list, and no mitigation text in the bundle. Analysis should remain tied to AMD-SB-1028 and authenticated platform inventory.
Mitigation direction
- Review AMD-SB-1028 for affected EPYC platforms and vendor guidance.
- Check OEM server firmware advisories for applicable BIOS or firmware updates.
- Prioritize critical, externally dependent, or hard-to-restart EPYC systems.
- Track AMD and OEM updates until affected status is resolved.
Validation and detection
- Inventory servers using AMD EPYC processors.
- Record current BIOS, firmware, and platform versions for those systems.
- Compare inventory against AMD-SB-1028 and OEM advisories.
- Confirm whether updated firmware is available and deployed.
- Monitor for unexplained stability or denial-of-service symptoms.
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-2021-26350 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-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.