Security readout for executives and security teams
Plain-English summary
AMD μProf includes a kernel driver, AMDPowerProfiler.sys, that may let a low-privileged local user reach CPU register functionality that should be protected. The reported impact is serious: privilege escalation and possible ring-0 code execution. Exposure appears tied to systems where AMD μProf is installed.
Executive priority
Treat as high priority where AMD μProf exists on shared, developer, or production-adjacent systems. The business risk is local privilege escalation to kernel-level control, but urgency should be driven by confirmed installation because exposure is tool-specific.
Technical view
CVE-2021-26334 is an access-control weakness in AMDPowerProfiler.sys, associated with AMD μProf Tool. The CVE states lower-privileged users may access MSRs in kernel, potentially leading to privilege escalation and ring-0 code execution. The bundle maps this to CWE-284 and does not provide CVSS details.
Likely exposure
Likely exposed assets are systems with AMD μProf Tool installed, especially developer, engineering, test, or performance-profiling machines. The driver name indicates a Windows kernel driver, but the source bundle does not enumerate platforms, versions, or deployment scope.
Exploitation context
The source bundle does not show CISA KEV listing, active exploitation, or public exploit evidence. Abuse would require local lower-privileged access to a system with the vulnerable driver present, according to the CVE description.
Researcher notes
Evidence is limited to the CVE record and AMD advisory reference. The record names AMDPowerProfiler.sys, MSR access from lower privilege, CWE-284, and possible ring-0 execution. It does not provide affected version ranges, CVSS scoring, exploit maturity, or named patched versions.
Mitigation direction
- Identify systems with AMD μProf Tool or AMDPowerProfiler.sys installed.
- Review AMD security bulletin AMD-SB-1016 for official fix guidance.
- Update or remove AMD μProf where vendor guidance recommends it.
- Restrict AMD μProf installation to systems that require profiling.
- Monitor privileged driver loading on sensitive workstations and servers.
Validation and detection
- Inventory endpoints for AMD μProf Tool installation.
- Check for the AMDPowerProfiler.sys driver on candidate systems.
- Compare installed AMD μProf versions against AMD-SB-1016 guidance.
- Confirm whether profiling tools are present on production systems.
- Review local privilege escalation alerts involving kernel drivers.
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-284: Authorization and privilege behavior lookup
Authorization weaknesses can support privilege escalation and valid-account review, depending on exploit path. 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 lookupPrivilege behavior lookup
The CVE wording references privilege impact, so privilege escalation and authorization behavior review may help. This is a Glexia inferred lookup path, not an official MITRE, ATT&CK, or CVE Program mapping.
Open ATT&CK lookupCVE-2021-26334 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-1016CVE 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.
Improper Access Control
Improper Access Control represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.