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CVE Record

CVE-2021-47331: usb: common: usb-conn-gpio: fix NULL pointer dereference of charger

In the Linux kernel, the following vulnerability has been resolved: usb: common: usb-conn-gpio: fix NULL pointer dereference of charger When power on system with OTG cable, IDDIG's interrupt arises before the charger registration, it will cause a NULL pointer dereference, fix the issue by registering the power supply before requesting IDDIG/VBUS irq.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue can crash affected systems during power-on when a USB OTG cable is present and an interrupt occurs before charger registration completes. The source bundle does not provide CVSS, CWE, or confirmed business impact, so urgency depends on whether your Linux builds use this USB GPIO connector path.

Executive priority

Do not treat this as an emergency based on the supplied evidence. Assign targeted remediation to teams managing Linux kernels on OTG-capable devices, especially embedded or appliance products where boot reliability matters.

Technical view

CVE-2021-47331 is a NULL pointer dereference in usb-conn-gpio. The described race occurs when IDDIG interrupt handling can run before charger power-supply registration. The upstream fix changes initialization order by registering the power supply before requesting IDDIG/VBUS IRQs.

Likely exposure

Exposure appears limited to Linux systems using the usb-conn-gpio USB OTG connector driver on affected kernel versions or commits. Systems without this driver path, without relevant OTG hardware, or already carrying the referenced stable fixes are less likely exposed.

Exploitation context

The bundle reports no KEV listing and provides no evidence of active exploitation. The described trigger involves powering on with an OTG cable and an interrupt timing issue. Treat this as a potential local or physical-condition denial-of-service risk unless vendor evidence says otherwise.

Researcher notes

The public record lacks CVSS, CWE, and detailed exploitability analysis. The key evidence is the kernel commit description: IDDIG IRQ can precede charger registration, causing a NULL pointer dereference. Avoid broad exposure claims without confirming driver usage and fixed commit presence.

Mitigation direction

  • Check whether your kernel includes the referenced stable fixes.
  • Prioritize vendor-supported kernel updates for affected Linux builds.
  • Review device-tree and kernel configuration for usb-conn-gpio usage.
  • For embedded fleets, test boot behavior with OTG cables attached.
  • If no vendor advisory applies, monitor Linux stable guidance.

Validation and detection

  • Inventory Linux kernel versions across affected device classes.
  • Check kernel source or package changelog for the stable commit references.
  • Confirm whether usb-conn-gpio is built or loaded.
  • Test representative hardware booting with OTG cable attached.
  • Document unaffected platforms where this driver path is absent.
Prepared
Confidence
medium
Sources
6

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-2021-47331 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
5Source 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
LinuxLinuxe3ee0e740c3887d2293e8d54a8707218d70d86ca, e3ee0e740c3887d2293e8d54a8707218d70d86ca, e3ee0e740c3887d2293e8d54a8707218d70d86ca, e3ee0e740c3887d2293e8d54a8707218d70d86caunaffected
LinuxLinux5.9, 0, 5.10.52, 5.12.19, 5.13.4, 5.14affected
Weakness

CWE details

No CWE listed

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