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CVE Record

CVE-2021-47206: usb: host: ohci-tmio: check return value after calling platform_get_resource()

In the Linux kernel, the following vulnerability has been resolved: usb: host: ohci-tmio: check return value after calling platform_get_resource() It will cause null-ptr-deref if platform_get_resource() returns NULL, we need check the return value.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-47206 is a Linux kernel bug in the OHCI TMIO USB host driver. If the kernel cannot obtain an expected platform resource, the driver may dereference a null pointer. The available sources do not provide a CVSS score or confirmed real-world exploitation.

Executive priority

Treat this as a targeted kernel reliability risk, not a broad internet-facing emergency. Patch during normal kernel maintenance, faster for affected embedded or hardware-specific Linux builds using this USB host driver.

Technical view

The issue is in usb host ohci-tmio handling after platform_get_resource(). The fix adds return-value checking when platform_get_resource() returns NULL, preventing a null-pointer dereference. The affected data lists Linux kernel versions from 2.6.28 through early 5.16-era stable lines, with multiple stable fix commits referenced.

Likely exposure

Exposure is likely limited to Linux systems running affected kernels where the ohci-tmio USB host driver is built or used. This is more relevant to specific hardware/platform builds than generic server exposure.

Exploitation context

The source bundle marks KEV as false and provides no evidence of active exploitation. Based on the description, the practical impact appears to be a kernel crash or denial of service if the vulnerable driver path is reached.

Researcher notes

Evidence is sparse: no CVSS, CWE, exploit detail, or operational trigger is provided. Analysis should focus on commit presence, driver reachability, kernel configuration, and vendor package mapping rather than assumed remote exploitability.

Mitigation direction

  • Apply a Linux stable or vendor kernel update containing the referenced fix.
  • For custom kernels, incorporate the platform_get_resource NULL-check patch.
  • Check vendor distribution guidance for exact fixed package versions.
  • Prioritize systems where ohci-tmio is enabled or platform USB resources are relevant.

Validation and detection

  • Inventory affected Linux kernel versions against the listed affected ranges.
  • Confirm whether the ohci-tmio driver is built, loaded, or required.
  • Verify patched source checks platform_get_resource() before dereferencing the result.
  • Confirm the running kernel includes one of the referenced stable fixes.
  • Run vendor-recommended kernel regression and boot validation after update.
Prepared
Confidence
medium
Sources
10

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-2021-47206 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
9Source 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
LinuxLinux78c73414f4f6744e2ea5a07b263a9698aa6f2416, 78c73414f4f6744e2ea5a07b263a9698aa6f2416, 78c73414f4f6744e2ea5a07b263a9698aa6f2416, 78c73414f4f6744e2ea5a07b263a9698aa6f2416, 78c73414f4f6744e2ea5a07b263a9698aa6f2416, 78c73414f4f6744e2ea5a07b263a9698aa6f2416, 78c73414f4f6744e2ea5a07b263a9698aa6f2416, 78c73414f4f6744e2ea5a07b263a9698aa6f2416unaffected
LinuxLinux2.6.28, 0, 4.4.293, 4.9.291, 4.14.256, 4.19.218, 5.4.162, 5.10.82, 5.15.5, 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.