Security readout for executives and security teams
Plain-English summary
This AMD TEE flaw can let an already-compromised local userspace send malformed commands that trigger out-of-bounds memory access. The likely business impact is system integrity loss or availability disruption on affected AMD platforms, not data theft according to the provided CVSS vector.
Executive priority
Treat as high priority for affected AMD fleets, especially systems exposed to untrusted local users or post-compromise lateral movement. This is not presented as remotely exploitable in the sources.
Technical view
CVE-2021-26383 is a CWE-787 insufficient bounds checking issue in AMD Trusted Execution Environment command handling. The CVSS 3.1 vector is local, low complexity, high privileges required, no user interaction, changed scope, with high integrity and availability impact and no confidentiality impact.
Likely exposure
Exposure is most likely on endpoints, workstations, embedded systems, GPU systems, or compute nodes using the AMD CPU, Radeon, Radeon PRO, Instinct, or ROCm products and versions listed in AMD advisories.
Exploitation context
The provided sources do not show active exploitation, and the CVE is not marked KEV. Exploitation requires local access and high privileges, limiting broad internet-scale risk but increasing concern after host compromise.
Researcher notes
Evidence is limited to the CVE record and AMD bulletins. Avoid assuming exploit availability or universal fixes. The key research task is mapping platform firmware, driver, and ROCm versions to AMD’s affected product guidance.
Mitigation direction
- Review the three AMD security bulletins for product-specific guidance.
- Apply AMD, OEM BIOS, firmware, driver, or ROCm updates where provided.
- Contact AMD Customer Engineering for Radeon PRO V520 or V620 guidance.
- Prioritize shared workstations, developer endpoints, and GPU compute hosts.
- Monitor CISA KEV and AMD advisories for status changes.
Validation and detection
- Inventory systems for the listed AMD CPU, GPU, embedded, and Instinct products.
- Compare BIOS, AGESA/PI, driver, and ROCm versions with AMD bulletin guidance.
- Confirm whether affected Radeon PRO V520 or V620 assets exist.
- Check vulnerability management tools for CVE-2021-26383 coverage.
- Document exceptions where vendor remediation is not yet available.
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.
CWE-787: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-26383 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
- High
- CVSS
- 7.9 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H1.55.8Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.9HighVector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:H
Source materials
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.
Out-of-bounds Write
Out-of-bounds Write represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.