Security readout for executives and security teams
Plain-English summary
This AMD driver vulnerability affects certain Radeon RX/PRO 5000 and 6000 series software stacks. A local attacker who already has some privileges could abuse weak signature verification while loading a Trusted Application, potentially reaching code execution in that trusted component or the OS/kernel.
Executive priority
Treat this as a high-priority endpoint driver issue, especially where affected AMD GPUs are deployed on shared or sensitive workstations. It is not described as remotely exploitable in the provided sources, but kernel-level impact raises business risk.
Technical view
CVE-2021-26391 is a CWE-347 signature-verification flaw in AMD Trusted Application loading. The CVSS 3.1 score is 7.8, with local attack vector, low complexity, low privileges required, no user interaction, and high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is likely on systems using AMD Radeon RX 5000/PRO W5000 or RX 6000/PRO W6000 series with AMD Radeon Software, Radeon Pro Software Enterprise, or Enterprise Driver components.
Exploitation context
The provided sources do not show CISA KEV listing or active exploitation. The attack requires local access with some privileges, so risk is higher on shared workstations, developer machines, kiosks, or endpoints where untrusted users can run code.
Researcher notes
Evidence identifies insufficient verification of multiple header signatures during Trusted Application loading. The bundle does not provide exploit details, proof-of-concept status, or exact fixed versions, so validation should focus on AMD advisory matching and local driver inventory.
Mitigation direction
- Check AMD bulletin AMD-SB-1029 for vendor guidance and affected driver details.
- Update AMD Radeon Software or Radeon Pro Enterprise drivers as AMD recommends.
- Prioritize shared or high-value endpoints with affected Radeon hardware.
- Limit unnecessary local user privileges on systems with affected drivers.
Validation and detection
- Inventory endpoints with affected Radeon RX or PRO W-series GPUs.
- Compare installed AMD driver packages against AMD-SB-1029 guidance.
- Confirm vulnerability scanner coverage maps findings to CVE-2021-26391.
- Review whether exposed systems allow untrusted local code execution.
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-347: 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 lookupExecution behavior lookup
The CVE wording references code or command execution, so execution technique review may help defensive triage. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-26391 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
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://www.amd.com/en/corporate/product-security/bulletin/amd-sb-1029CVE reference
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.
Improper Verification of Cryptographic Signature
Improper Verification of Cryptographic Signature represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.