LiveActive security incident?Get immediate response
CVE Record

CVE-2022-49342: net: ethernet: bgmac: Fix refcount leak in bcma_mdio_mii_register

In the Linux kernel, the following vulnerability has been resolved: net: ethernet: bgmac: Fix refcount leak in bcma_mdio_mii_register of_get_child_by_name() returns a node pointer with refcount incremented, we should use of_node_put() on it when not need anymore. Add missing of_node_put() to avoid refcount leak.

MediumCVSS 5.5Not KEV-listedUpdated
Discuss exposureBack to CVEs
Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a resource leak in a Broadcom Ethernet driver path. It is rated medium because the known impact is denial of service, not data theft or code execution. Exposure depends on whether affected kernel versions and the bgmac/bcma MDIO code path are present.

Executive priority

Treat as a routine but real availability risk. Prioritize kernel maintenance for exposed Linux systems, especially embedded or network-facing appliances using Broadcom Ethernet hardware. There is no source-backed evidence of active exploitation or data compromise.

Technical view

bcma_mdio_mii_register failed to release a device-tree node reference returned by of_get_child_by_name. The missing of_node_put can leak references. CVSS 3.1 is 5.5: local attack vector, low complexity, low privileges, no user interaction, and high availability impact.

Likely exposure

Linux systems running affected kernel builds that include and use the bgmac Broadcom Ethernet driver path may be exposed. The bundle lists Linux kernel versions including 4.8, 5.17.15, 5.18.4, and 5.19 as affected data, but distribution backports may differ.

Exploitation context

The source bundle does not show active exploitation, and KEV is false. CVSS indicates local, low-privileged conditions with availability impact only. No public exploit evidence is provided in the supplied sources.

Researcher notes

The core bug is a device-tree reference count leak in bcma_mdio_mii_register. The available evidence is limited to the CVE record, CVSS metadata, and kernel stable commit references. Product exposure should be validated through kernel configuration, hardware use, and downstream vendor backports.

Mitigation direction

  • Apply vendor kernel updates that include the referenced stable fixes.
  • Check distribution advisories for backported fixes before relying on version numbers.
  • Prioritize systems using Broadcom bgmac Ethernet or bcma MDIO hardware paths.
  • If patching is delayed, limit local access by untrusted users.
  • Track Linux kernel and distribution guidance for this CVE.

Validation and detection

  • Inventory Linux kernel versions across servers, appliances, and embedded systems.
  • Confirm whether bgmac and bcma MDIO support is present or used.
  • Map installed kernels to vendor advisories or the referenced stable commits.
  • Verify patched systems include the missing of_node_put fix.
  • Document exceptions where the affected driver path is absent.
Prepared
Confidence
high
Sources
5

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

Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.

cve · low confidence lookup

CVE-2022-49342 mapping review

Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.

Open ATT&CK lookup
Vulnerability profileCVE Program record
Severity
Medium
CVSS
5.5 (3.1)
Known Exploited
No
Published

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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.

1CVSS vectors
3Timeline events
1ADP providers
4Source links

SSVC decision data

CISA-ADPCISA Coordinator
Timestamp
Version
2.0.3
Exploitation: noneAutomatable: noTechnical Impact: partial

CVSS vector scores

1 official score

We collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.

ScoreVersionSeverityVectorExploitImpactSource
5.5CVSS 3.1MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H1.83.6CISA-ADP

Vulnerability scoring details

Base CVSS 3.1 score

5.5Medium
CVSS 3.1 vector shape for CVE-2022-49342Attack VectorAttack ComplexityPrivileges RequiredUser InteractionScopeConfidentiality ImpactIntegrity ImpactAvailability Impact

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NetworkAdjacentLocalPhysical
Attack Complexity
LowHigh
Privileges Required
NoneLowHigh
User Interaction
NoneRequired
Scope
ChangedUnchanged
Confidentiality Impact
HighLowNone
Integrity Impact
HighLowNone
Availability Impact
HighLowNone

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
cvssV3_1other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinux55954f3bfdacc5908515b0c306cea23e77fab740, 55954f3bfdacc5908515b0c306cea23e77fab740, 55954f3bfdacc5908515b0c306cea23e77fab740unaffected
LinuxLinux4.8, 0, 5.17.15, 5.18.4, 5.19affected
Weakness

CWE details

No CWE listed

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