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CVE Record

CVE-2021-47079: platform/x86: ideapad-laptop: fix a NULL pointer dereference

In the Linux kernel, the following vulnerability has been resolved: platform/x86: ideapad-laptop: fix a NULL pointer dereference The third parameter of dytc_cql_command should not be NULL since it will be dereferenced immediately.

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 the ideapad-laptop platform driver. A function could be called with a NULL parameter that is dereferenced immediately, which can crash affected kernel code paths. The source bundle does not provide CVSS, CWE, exploitability, or business-impact detail.

Executive priority

Track and patch through normal kernel update processes unless asset review shows broad affected endpoint exposure. There is no sourced evidence of active exploitation, but kernel crashes can still affect reliability and support costs.

Technical view

The issue is a NULL pointer dereference in platform/x86 ideapad-laptop. The third parameter to dytc_cql_command was allowed to be NULL even though the function dereferences it immediately. The CVE record identifies affected Linux kernel versions including 5.12 before 5.12.7 and references stable kernel fixes.

Likely exposure

Exposure appears limited to Linux systems running affected kernel builds where the ideapad-laptop driver path is present or reachable. The provided data names Linux kernel versions and commits, but does not prove impact across all distributions or hardware.

Exploitation context

No active exploitation is identified in the provided bundle, and CISA KEV status is false. The sources do not describe remote exploitation, privilege escalation, or public exploit activity. Treat this as a kernel stability and potential local-impact issue unless vendor guidance says otherwise.

Researcher notes

Evidence is narrow: the CVE description states the NULL dereference and references two kernel stable commits. No CVSS vector, CWE, proof-of-concept, attacker prerequisites, or exploit path is provided, so deeper impact assessment requires reviewing the linked patches and vendor advisories.

Mitigation direction

  • Update affected Linux kernels to a vendor build containing the referenced stable fixes.
  • Check distribution advisories for backported patches and supported package versions.
  • Prioritize endpoints or images using affected 5.12-series kernels.
  • Avoid assuming unaffected status from version strings when vendors backport fixes.

Validation and detection

  • Inventory Linux kernel versions across endpoints and server images.
  • Confirm whether affected builds include the referenced stable commits or vendor backports.
  • Identify systems where the ideapad-laptop driver is present or loaded.
  • Review vendor security advisories for distribution-specific affected and fixed versions.
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-2021-47079 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
LinuxLinuxff36b0d953dc4cbc40a72945920ff8e805f1b0da, ff36b0d953dc4cbc40a72945920ff8e805f1b0daunaffected
LinuxLinux5.12, 0, 5.12.7, 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.