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CVE Record

CVE-2021-47033: mt76: mt7615: fix tx skb dma unmap

In the Linux kernel, the following vulnerability has been resolved: mt76: mt7615: fix tx skb dma unmap The first pointer in the txp needs to be unmapped as well, otherwise it will leak DMA mapping entries

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 resource cleanup bug in the mt76 mt7615 wireless driver. A DMA mapping entry may not be released correctly, which can waste kernel/driver resources over time. The public record does not provide CVSS, active exploitation, or a detailed business-impact statement.

Executive priority

Handle through normal kernel patch management unless mt7615 wireless devices are business-critical, embedded, or difficult to patch. The available evidence supports operational hygiene rather than emergency response.

Technical view

The resolved bug is in mt76 mt7615 transmit skb DMA unmapping. The first pointer in the txp structure also needed DMA unmapping; otherwise DMA mapping entries leak. The CVE record lists Linux kernel versions and stable kernel commits, but does not describe exploit prerequisites or a complete impact chain.

Likely exposure

Exposure is most relevant to Linux systems using the mt76 mt7615 MediaTek wireless driver on affected kernel versions. Servers without this driver or hardware are less likely to be exposed. Confirm against the running kernel, loaded modules, and distribution kernel advisories.

Exploitation context

The source bundle marks KEV as false and provides no cited evidence of active exploitation. It also does not state whether exploitation is remote, local, or requires a specific traffic pattern. Treat exploitation context as incomplete.

Researcher notes

The record is sparse: no CVSS, CWE, exploit status, or detailed threat model is supplied. Analysis should stay close to the kernel fix: incomplete DMA unmapping causing leaked DMA mapping entries in mt7615 transmit handling.

Mitigation direction

  • Apply vendor or distribution kernel updates containing the referenced stable fixes.
  • Prioritize devices using mt76 or mt7615 wireless support.
  • Check Linux distribution advisories for affected package versions and backports.
  • If no update is available, follow vendor guidance for temporary risk reduction.

Validation and detection

  • Inventory hosts running Linux kernels listed or derived from affected ranges.
  • Confirm whether mt76 or mt7615 drivers are present or loaded.
  • Verify the kernel package includes one of the referenced stable fixes or a vendor backport.
  • Track any vendor advisory for CVSS, exploitability, and operational impact updates.
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-2021-47033 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
LinuxLinux27d5c528a7ca08dcd44877fdd9fc08b76630bf77, 27d5c528a7ca08dcd44877fdd9fc08b76630bf77, 27d5c528a7ca08dcd44877fdd9fc08b76630bf77, 27d5c528a7ca08dcd44877fdd9fc08b76630bf77unaffected
LinuxLinux5.10, 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.