Security readout for executives and security teams
Plain-English summary
CVE-2021-26382 affects some AMD Ryzen and Athlon systems. A local attacker who already has root privileges could load a legitimately signed but improperly accepted firmware image into the AMD Audio Co-Processor, potentially causing denial of service. The public bundle does not provide CVSS scoring or confirm active exploitation.
Executive priority
Treat this as a targeted platform-hardening item, not an emergency remote-exploitation event. It requires root access and has a stated denial-of-service impact, but affected AMD fleet coverage should be verified and remediated through AMD or OEM firmware guidance.
Technical view
The issue is an authorization or key-usage validation weakness in ACP firmware authentication. With root account privileges, an attacker may load any legitimately signed firmware image, even when its signing key is not declared usable for ACP firmware authentication. The stated impact is potential denial of service only.
Likely exposure
Exposure is most relevant to endpoints or systems using affected AMD Ryzen or Athlon platforms where an attacker can obtain root privileges. The bundle says affected versions are “various,” so asset validation requires matching systems against AMD SB-1027 and OEM platform guidance.
Exploitation context
The source bundle does not show KEV listing, public exploitation, exploit maturity, or remote attack capability. The prerequisite is root account privileges, which means this is more likely a post-compromise stability or persistence-adjacent risk than an initial access issue.
Researcher notes
Evidence is limited to the CVE description and AMD advisory reference. No CVSS, CWE, affected version granularity, patch details, exploit status, or technical proof details are included in the provided bundle. Avoid assuming broader AMD products or impacts beyond ACP denial of service.
Mitigation direction
- Review AMD SB-1027 for affected processor families and vendor guidance.
- Check OEM BIOS or firmware advisories for applicable platform updates.
- Prioritize systems where attackers could gain local administrative or root access.
- Limit root/admin access and monitor privileged firmware-related operations.
- Track AMD and OEM guidance if no applicable update is currently listed.
Validation and detection
- Inventory systems using AMD Ryzen and Athlon processors.
- Map processor models and platform firmware versions to AMD SB-1027.
- Check OEM support portals for BIOS or firmware applicability.
- Confirm whether ACP firmware is present and enabled on affected platforms.
- Review EDR or system logs for unusual privileged firmware activity.
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-2021-26382 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
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.