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CVE Record

CVE-2021-47083: pinctrl: mediatek: fix global-out-of-bounds issue

In the Linux kernel, the following vulnerability has been resolved: pinctrl: mediatek: fix global-out-of-bounds issue When eint virtual eint number is greater than gpio number, it maybe produce 'desc[eint_n]' size globle-out-of-bounds issue.

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 is a Linux kernel bug in MediaTek pin control handling. Under certain numbering conditions, the kernel may read or write outside a global array. The source bundle does not provide impact details, CVSS, or known exploitation, so urgency depends on whether affected MediaTek-based Linux systems exist in your fleet.

Executive priority

Do not treat this as an internet-wide emergency from the provided evidence. Assign platform owners to confirm MediaTek Linux exposure and patch through normal kernel maintenance, escalating if affected devices are safety-critical, customer-facing, or hard to update.

Technical view

The flaw is described as a global out-of-bounds issue in the MediaTek pinctrl EINT path when a virtual EINT number exceeds the GPIO number and indexes desc[eint_n]. The record lists Linux kernel affected entries and four stable kernel commits as references. No CWE, CVSS, exploitability, or detailed attack prerequisites are provided.

Likely exposure

Exposure appears most relevant to Linux systems using the MediaTek pinctrl/EINT kernel code in the affected kernel versions listed by the CVE record. The bundle does not identify distributions, device models, configurations, or whether remote access is involved.

Exploitation context

The provided sources do not report active exploitation, and the CVE is not marked KEV. They also do not describe a public exploit, attack path, privileges required, or user interaction requirements. Treat exploitation context as incomplete.

Researcher notes

The record is sparse: no CVSS, CWE, affected CPEs, exploit status, or attack prerequisites. Analysis should focus on code reachability in MediaTek pinctrl/EINT configurations and whether vendor kernels include one of the referenced stable commits.

Mitigation direction

  • Identify Linux assets using MediaTek kernel pinctrl or EINT support.
  • Update affected kernels to vendor releases containing the referenced stable fixes.
  • For self-maintained kernels, evaluate backporting the referenced upstream stable commits.
  • Check distribution or device vendor advisories before applying kernel changes.
  • Prioritize embedded, mobile, or appliance Linux systems using MediaTek SoCs.

Validation and detection

  • Inventory running kernel versions across MediaTek-based Linux systems.
  • Confirm whether the MediaTek pinctrl/EINT driver code is present or enabled.
  • Map kernel builds against the CVE record's affected versions and fix commits.
  • Review vendor kernel changelogs for the referenced stable commit identifiers.
  • After updating, confirm systems boot and hardware interrupt functions behave normally.
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-2021-47083 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
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
LinuxLinuxfb5fa8dc151b2364c975a9070eedb28a354a995a, fb5fa8dc151b2364c975a9070eedb28a354a995a, fb5fa8dc151b2364c975a9070eedb28a354a995a, fb5fa8dc151b2364c975a9070eedb28a354a995aunaffected
LinuxLinux4.20, 0, 5.4.169, 5.10.89, 5.15.12, 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.