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CVE Record

CVE-2021-47233: regulator: rt4801: Fix NULL pointer dereference if priv->enable_gpios is NULL

In the Linux kernel, the following vulnerability has been resolved: regulator: rt4801: Fix NULL pointer dereference if priv->enable_gpios is NULL devm_gpiod_get_array_optional may return NULL if no GPIO was assigned.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-47233 is a Linux kernel driver bug that may crash affected systems in specific RT4801 regulator configurations. The issue is a NULL pointer dereference when optional GPIO data is absent. The provided sources do not show remote code execution, privilege escalation, CVSS scoring, or active exploitation.

Executive priority

Treat this as a targeted kernel maintenance issue unless affected RT4801-based systems are business critical. There is no sourced evidence of active exploitation, but kernel crashes can affect availability. Patch through normal vendor kernel update processes after exposure is confirmed.

Technical view

The Linux kernel RT4801 regulator driver called devm_gpiod_get_array_optional, which can return NULL when no GPIO is assigned. The driver then dereferenced priv->enable_gpios. Stable kernel commits resolve the flaw by handling the NULL case. Source data identifies affected Linux kernel versions around 5.10 through 5.13, including fixed points 5.10.46 and 5.12.13.

Likely exposure

Exposure appears limited to Linux systems using affected kernels with the RT4801 regulator driver and no assigned enable GPIO. General Linux deployments may not be exposed if the driver or hardware path is absent. Distribution backports may change practical exposure.

Exploitation context

The source bundle does not cite exploitation in the wild, KEV listing, public exploit activity, or exploit prerequisites. The described failure mode is a kernel NULL pointer dereference, most likely affecting availability in a specific hardware or driver configuration.

Researcher notes

Evidence is concise and kernel-commit based. The CVE record lacks CVSS, CWE, detailed exploitability, and operational prerequisites. Avoid broad claims beyond affected kernel versions and the RT4801 regulator NULL dereference fixed in stable commits.

Mitigation direction

  • Update to a vendor kernel containing the referenced stable fixes.
  • Check distribution advisories for backported fixes and supported kernel packages.
  • Prioritize systems using kernels in the affected 5.10 through 5.13 range.
  • If updates are unavailable, consult vendor guidance for RT4801 driver exposure.
  • Do not assume generic Linux systems are exposed without driver and hardware evidence.

Validation and detection

  • Inventory running kernel versions and vendor patch levels.
  • Confirm whether the RT4801 regulator driver is present or enabled.
  • Review vendor changelogs for the referenced stable commit IDs.
  • Check device configuration for RT4801 regulator and enable GPIO usage.
  • Monitor kernel logs for related NULL dereference or regulator driver faults.
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-2021-47233 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
LinuxLinux5bbbfc7f7f0a44b7a85ab3872dd2ccce7019f7b1, 5bbbfc7f7f0a44b7a85ab3872dd2ccce7019f7b1, 5bbbfc7f7f0a44b7a85ab3872dd2ccce7019f7b1unaffected
LinuxLinux5.10, 0, 5.10.46, 5.12.13, 5.13affected
Weakness

CWE details

No CWE listed

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