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CVE Record

CVE-2022-50033: usb: host: ohci-ppc-of: Fix refcount leak bug

In the Linux kernel, the following vulnerability has been resolved: usb: host: ohci-ppc-of: Fix refcount leak bug In ohci_hcd_ppc_of_probe(), of_find_compatible_node() will return a node pointer with refcount incremented. We should use of_node_put() when it is not used anymore.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2022-50033 is a Linux kernel bug in a PowerPC Open Firmware USB host driver. The issue is a reference count leak during device probing. Public sources do not provide a CVSS score, exploitation evidence, or a concrete business impact. Treat it as a maintenance-priority kernel fix unless affected hardware is business-critical.

Executive priority

Low immediate urgency based on available evidence. Address through normal kernel patch cycles, with faster handling for niche PowerPC systems where USB host stability matters to operations. No source indicates active exploitation or emergency remediation.

Technical view

In ohci_hcd_ppc_of_probe(), of_find_compatible_node() increments a device-tree node reference count. The fix adds the expected of_node_put() when the node is no longer needed. The CVE record lists Linux kernel versions as affected and references multiple stable-branch commits carrying the correction.

Likely exposure

Exposure appears limited to Linux systems using the ohci-ppc-of USB host controller path, associated with PowerPC/Open Firmware platforms. General Linux servers not using this driver path may not be practically exposed. Confirm against kernel configuration, hardware platform, and vendor kernel backports.

Exploitation context

The provided sources do not report active exploitation, public exploit code, KEV listing, privilege requirements, or attack path. The described flaw is a refcount leak, which generally suggests resource-management risk, but the sources do not state a proven denial-of-service or security impact.

Researcher notes

Evidence is sparse: no CVSS, CWE, exploit status, or detailed impact is provided. Analysis should focus on commit lineage, stable-branch backports, and whether the affected probe routine is reachable on the target platform. Avoid assuming exposure on non-PowerPC systems without driver evidence.

Mitigation direction

  • Check your Linux vendor advisory for CVE-2022-50033 applicability and fixed packages.
  • Update affected kernels to versions containing the referenced stable commits or vendor backports.
  • Prioritize systems using PowerPC/Open Firmware platforms with OHCI USB host support.
  • If no vendor fix is available, follow vendor guidance for temporary risk reduction.

Validation and detection

  • Inventory kernel versions and vendor package revisions on potentially affected systems.
  • Confirm whether the ohci-ppc-of driver path is present and relevant to the hardware.
  • Verify the running kernel includes the appropriate referenced upstream stable fix.
  • Document non-exposure when systems lack the affected platform or driver path.
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-2022-50033 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
0ADP providers
9Source links

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.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux796bcae7361c28cf825780f6f1aac9dd3411394e, 796bcae7361c28cf825780f6f1aac9dd3411394e, 796bcae7361c28cf825780f6f1aac9dd3411394e, 796bcae7361c28cf825780f6f1aac9dd3411394e, 796bcae7361c28cf825780f6f1aac9dd3411394e, 796bcae7361c28cf825780f6f1aac9dd3411394e, 796bcae7361c28cf825780f6f1aac9dd3411394e, 796bcae7361c28cf825780f6f1aac9dd3411394eunaffected
LinuxLinux2.6.29, 0, 4.9.326, 4.14.291, 4.19.256, 5.4.211, 5.10.138, 5.15.63, 5.19.4, 6.0affected
Weakness

CWE details

No CWE listed

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