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CVE Record

CVE-2021-47513: net: dsa: felix: Fix memory leak in felix_setup_mmio_filtering

In the Linux kernel, the following vulnerability has been resolved: net: dsa: felix: Fix memory leak in felix_setup_mmio_filtering Avoid a memory leak if there is not a CPU port defined. Addresses-Coverity-ID: 1492897 ("Resource leak") Addresses-Coverity-ID: 1492899 ("Resource leak")

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This Linux kernel issue is a memory leak in the DSA Felix network switch driver. The source says the leak occurs when no CPU port is defined. It is not marked as actively exploited, and no CVSS score is provided, so business urgency depends on whether affected kernels and Felix-supported networking hardware are in use.

Executive priority

Treat as a targeted kernel maintenance item, not an emergency based on current evidence. Raise priority for products or appliances that use affected Linux kernels with Felix network switching because resource leaks can affect availability over time.

Technical view

CVE-2021-47513 fixes a resource leak in felix_setup_mmio_filtering within net/dsa/felix. The CVE record states Linux kernel versions including 5.15 through 5.15.8 and 5.16 are affected. The issue was identified by Coverity resource leak findings 1492897 and 1492899. Public detail is limited.

Likely exposure

Likely limited to Linux systems using affected kernel builds with the DSA Felix driver path. General Linux exposure is unclear from the bundle. Embedded, appliance, or networking platforms using Felix-supported switch hardware deserve the closest review.

Exploitation context

The bundle provides no evidence of active exploitation, KEV listing, public exploit, or remote attack path. The described impact is a memory leak when a CPU port is not defined, which suggests operational stability risk rather than confirmed compromise risk.

Researcher notes

Evidence is sparse: no CVSS, CWE, exploit details, or vendor workaround is included. The strongest technical signal is the kernel fix description and Coverity resource leak IDs. Validate exposure through kernel provenance, driver usage, and whether downstream packages include the stable commits.

Mitigation direction

  • Check vendor or distribution kernel advisories for a fixed package.
  • Apply a kernel update containing the referenced stable fixes.
  • Prioritize affected networking appliances and embedded Linux platforms.
  • Track resource usage until patched if affected systems cannot be updated.
  • Avoid inventing compensating controls; follow vendor guidance.

Validation and detection

  • Inventory kernel versions against the affected version data.
  • Confirm whether the DSA Felix driver is present and used.
  • Check whether the referenced stable commits are included in your build.
  • Review device configuration for Felix switch CPU port definitions.
  • Monitor for unexplained memory growth on potentially affected systems.
Prepared
Confidence
medium
Sources
4

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-2021-47513 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
3Source 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
LinuxLinux8d5f7954b7c8de54902a8beda141064a7e2e6ee0, 8d5f7954b7c8de54902a8beda141064a7e2e6ee0, 6b55eadb0b1da827f198364c426ace72c16c49b0unaffected
LinuxLinux5.15, 0, 5.15.8, 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.