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CVE Record

CVE-2022-48856: gianfar: ethtool: Fix refcount leak in gfar_get_ts_info

In the Linux kernel, the following vulnerability has been resolved: gianfar: ethtool: Fix refcount leak in gfar_get_ts_info The of_find_compatible_node() function returns a node pointer with refcount incremented, We should use of_node_put() on it when done Add the missing of_node_put() to release the refcount.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2022-48856 is a Linux kernel bug in the gianfar Ethernet driver. A missing reference release can leak a device-tree node reference when timestamp information is requested through ethtool. The source bundle does not show active exploitation, CVSS scoring, or business-impact evidence.

Executive priority

Treat this as routine kernel maintenance unless your environment depends on affected gianfar networking. There is no sourced evidence of exploitation or severe impact, but kernel fixes should be absorbed through normal patch cycles.

Technical view

The issue is in gfar_get_ts_info. of_find_compatible_node() returns a node with an incremented reference count, but the old code did not call of_node_put() when finished. Upstream stable commits add the missing release across affected kernel branches.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions where the gianfar driver is present and relevant. The bundle lists affected Linux kernel branches including 4.18, 4.19.235, 5.4.185, 5.10.106, 5.15.29, 5.16.15, and 5.17.

Exploitation context

No provided source states active exploitation, and KEV is false. The bundle describes a refcount leak, not a complete attack chain. Practical exploitability, required privileges, and impact are not established by the provided evidence.

Researcher notes

The key evidence is the upstream fix rationale: of_find_compatible_node() increments the node refcount, requiring of_node_put() after use. The bundle lacks CVSS, CWE, exploitability notes, and operational impact details, so conclusions should stay conservative.

Mitigation direction

  • Upgrade to a kernel containing the referenced upstream stable fix.
  • Use distribution kernel updates rather than hand-applying patches where possible.
  • Check vendor guidance if no patched package is available.
  • Prioritize systems where the gianfar driver is enabled or in use.

Validation and detection

  • Inventory kernels against the affected versions listed in the CVE bundle.
  • Confirm whether the gianfar driver is built, loaded, or required.
  • Verify the running kernel includes one of the referenced stable commits.
  • Track vendor advisories for package-level remediation status.
Prepared
Confidence
medium
Sources
8

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-2022-48856 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
7Source 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
LinuxLinux7349a74ea75ca27606ead81df3ed67f1b32a94ba, 7349a74ea75ca27606ead81df3ed67f1b32a94ba, 7349a74ea75ca27606ead81df3ed67f1b32a94ba, 7349a74ea75ca27606ead81df3ed67f1b32a94ba, 7349a74ea75ca27606ead81df3ed67f1b32a94ba, 7349a74ea75ca27606ead81df3ed67f1b32a94baunaffected
LinuxLinux4.18, 0, 4.19.235, 5.4.185, 5.10.106, 5.15.29, 5.16.15, 5.17affected
Weakness

CWE details

No CWE listed

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