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CVE Record

CVE-2021-47022: mt76: mt7615: fix memleak when mt7615_unregister_device()

In the Linux kernel, the following vulnerability has been resolved: mt76: mt7615: fix memleak when mt7615_unregister_device() mt7615_tx_token_put() should get call before mt76_free_pending_txwi().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This CVE describes a Linux kernel memory leak in the mt76 driver path for MediaTek MT7615 wireless devices. The public record identifies a code fix, but provides no CVSS score, severity, or evidence of active exploitation. Business urgency depends on whether affected Linux systems use this wireless driver.

Executive priority

Handle through normal kernel patch management unless affected wireless-enabled Linux assets are business-critical or exposed in sensitive environments. There is not enough source evidence to justify emergency response.

Technical view

The issue is in mt7615_unregister_device(), where mt7615_tx_token_put() needed to run before mt76_free_pending_txwi(). The CVE record lists Linux kernel versions and stable kernel commits associated with the fix. Available sources do not describe privilege requirements, trigger conditions, or security impact beyond a memory leak.

Likely exposure

Exposure is most likely on Linux systems with the mt76 MT7615 wireless driver in the affected kernel versions listed by the CVE record. Systems without this driver or hardware are less likely to be exposed, but package backports require vendor-specific confirmation.

Exploitation context

The source bundle does not show CISA KEV listing, public exploitation, exploit availability, or attacker requirements. Treat this as a kernel maintenance vulnerability until vendor advisories or operational evidence indicate higher risk.

Researcher notes

The available record is sparse: no CVSS, CWE, exploit notes, or detailed impact analysis. The strongest facts are the affected Linux context, mt76/mt7615 unregister path, memory leak description, and referenced stable kernel commits.

Mitigation direction

  • Check Linux distribution advisories for CVE-2021-47022 coverage.
  • Update kernels to builds containing the referenced stable fixes.
  • Prioritize systems using MediaTek MT7615 or mt76 wireless support.
  • If no patch is available, follow vendor guidance for temporary controls.

Validation and detection

  • Inventory Linux kernel versions across managed systems.
  • Check whether mt76 or MT7615 wireless support is present.
  • Compare installed kernel changelogs against the referenced stable commits.
  • Confirm vulnerability scanner findings against distribution backport notes.
Prepared
Confidence
medium
Sources
6

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-2021-47022 mapping review

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

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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
5Source 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
LinuxLinuxaec5719681405af21102c2407b01f83ed19e9833, 1aca6c30d4b655a4fd29c4ad66985b60def88eed, a6275e934605646ef81b02d8d1164f21343149c9, a6275e934605646ef81b02d8d1164f21343149c9unaffected
LinuxLinux5.12, 0, 5.10.37, 5.11.21, 5.12.4, 5.13affected
Weakness

CWE details

No CWE listed

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