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CVE Record

CVE-2021-47270: usb: fix various gadgets null ptr deref on 10gbps cabling.

In the Linux kernel, the following vulnerability has been resolved: usb: fix various gadgets null ptr deref on 10gbps cabling. This avoids a null pointer dereference in f_{ecm,eem,hid,loopback,printer,rndis,serial,sourcesink,subset,tcm} by simply reusing the 5gbps config for 10gbps.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel USB gadget-mode bug. With 10Gbps USB cabling, several gadget functions could hit a null pointer and fail. The likely business impact is device instability or denial of service on affected Linux-based products that expose USB gadget functionality.

Executive priority

Treat this as targeted operational risk, not broad emergency exposure. Prioritize products and sites where Linux devices use USB gadget mode with high-speed USB connectivity, and track vendor kernel updates before deployment decisions.

Technical view

The resolved kernel issue affects f_ecm, f_eem, f_hid, f_loopback, f_printer, f_rndis, f_serial, f_sourcesink, f_subset, and f_tcm. The fix reuses the 5Gbps configuration for 10Gbps paths to avoid a null pointer dereference. No CVSS, CWE, or exploit mechanics are provided.

Likely exposure

Exposure is most plausible in Linux systems using USB gadget mode, especially embedded devices, appliances, development boards, or products connected over 10Gbps USB. General-purpose servers or endpoints not using these gadget functions are less likely to be exposed, based on the provided sources.

Exploitation context

The bundle does not show CISA KEV listing or active exploitation evidence. The described trigger involves 10Gbps USB cabling and affected gadget functions, suggesting physical or device-adjacent conditions rather than internet-facing exposure, but the sources do not define attacker requirements.

Researcher notes

Evidence is limited to the CVE record and Linux stable commit references. The record identifies null pointer dereference avoidance but does not provide CVSS scoring, CWE classification, exploit status, detailed affected distributions, or independent mitigation guidance.

Mitigation direction

  • Identify Linux systems using USB gadget functions named in the CVE.
  • Check vendor kernel advisories and stable kernel fixes for applicable updates.
  • Prioritize embedded or appliance fleets with 10Gbps USB connectivity.
  • If updates are unavailable, reduce unnecessary USB gadget exposure where operationally feasible.

Validation and detection

  • Inventory kernel versions across potentially exposed Linux-based products.
  • Confirm whether USB gadget modules or functions are enabled.
  • Review vendor firmware or kernel changelogs for referenced stable commits.
  • Test updated firmware in representative 10Gbps USB configurations.
Prepared
Confidence
medium
Sources
9

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-2021-47270 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
8Source 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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxeaef50c760576bca70b87fdc26eb87a3660529f8, eaef50c760576bca70b87fdc26eb87a3660529f8, eaef50c760576bca70b87fdc26eb87a3660529f8, eaef50c760576bca70b87fdc26eb87a3660529f8, eaef50c760576bca70b87fdc26eb87a3660529f8, eaef50c760576bca70b87fdc26eb87a3660529f8, eaef50c760576bca70b87fdc26eb87a3660529f8unaffected
LinuxLinux4.6, 0, 4.9.273, 4.14.237, 4.19.195, 5.4.126, 5.10.44, 5.12.11, 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.