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CVE Record

CVE-2021-47093: platform/x86: intel_pmc_core: fix memleak on registration failure

In the Linux kernel, the following vulnerability has been resolved: platform/x86: intel_pmc_core: fix memleak on registration failure In case device registration fails during module initialisation, the platform device structure needs to be freed using platform_device_put() to properly free all resources (e.g. the device name).

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel memory leak in the Intel PMC Core platform driver during module initialization failure. The public record describes resource cleanup, not data theft or remote compromise. Business urgency is lower unless affected kernels are widely deployed in environments where kernel reliability and uptime are critical.

Executive priority

Treat this as routine kernel hygiene unless sensitive Linux fleets remain on affected kernels. Prioritize through normal patch cycles, with higher urgency for reliability-critical systems or custom kernel builds that may miss stable backports.

Technical view

The fixed bug is in platform/x86 intel_pmc_core. If platform device registration fails during module initialization, the platform device structure was not released with platform_device_put(), leaking resources such as the device name. The CVE record lists affected Linux kernel versions and stable kernel commits, but no CVSS, CWE, or exploit evidence.

Likely exposure

Exposure is likely limited to Linux systems running affected kernels with the intel_pmc_core driver path present. The vulnerable condition requires device registration failure during module initialization, so practical exposure depends on kernel configuration, hardware, and distribution backports.

Exploitation context

The source bundle does not show active exploitation, public exploit activity, KEV listing, or weaponized details. Based on the description, the impact appears to be resource leakage on a failure path rather than direct privilege escalation or remote code execution.

Researcher notes

Evidence is narrow and patch-focused. The useful validation work is confirming affected kernel lineage and whether the referenced cleanup fix is present. The source bundle does not provide severity scoring, crash evidence, exploitability analysis, or distribution-specific package status.

Mitigation direction

  • Apply vendor kernel updates containing the referenced stable fixes.
  • For custom kernels, verify the stable commits are backported correctly.
  • Track distribution advisories for CVE-2021-47093 mapping.
  • Avoid direct deployment workflows that bypass normal kernel testing.

Validation and detection

  • Inventory Linux kernel versions across affected systems.
  • Confirm vendor packages include the referenced stable kernel fixes.
  • Check whether intel_pmc_core is built or loaded where relevant.
  • Review kernel changelogs for CVE-2021-47093 backport notes.
Prepared
Confidence
medium
Sources
5

Public sources used

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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

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CVE-2021-47093 mapping review

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Vulnerability profileCVE Program record
Severity
Unknown
CVSS
Not scored
Known Exploited
No
Published
Official CVE source material

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.

0CVSS vectors
3Timeline events
2ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

Vulnerability timeline

Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.

  1. CVE reservedCVE Program

    The CVE ID was reserved by the assigning CNA.

  2. CVE publishedCVE Program

    The CVE record was published.

  3. CVE updatedCVE Program

    The CVE record metadata indicates this as the latest update time.

ADP provider summaries

CISA-ADPCISA ADP Vulnrichment
other:ssvc
CVECVE Program Container

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux938835aa903ae19ad62805134f79bbcf20fc3bea, 938835aa903ae19ad62805134f79bbcf20fc3bea, 938835aa903ae19ad62805134f79bbcf20fc3beaunaffected
LinuxLinux5.9, 0, 5.10.89, 5.15.12, 5.16affected
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.