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CVE Record

CVE-2021-47149: net: fujitsu: fix potential null-ptr-deref

In the Linux kernel, the following vulnerability has been resolved: net: fujitsu: fix potential null-ptr-deref In fmvj18x_get_hwinfo(), if ioremap fails there will be NULL pointer deref. To fix this, check the return value of ioremap and return -1 to the caller in case of failure.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysislow

Security readout for executives and security teams

Plain-English summary

CVE-2021-47149 is a Linux kernel flaw in Fujitsu network driver code. If a memory mapping operation fails, the kernel may dereference a null pointer. The likely business impact is service instability or crash on exposed systems, but the provided sources do not show active exploitation, CVSS severity, or remote attack details.

Executive priority

Treat this as routine kernel maintenance unless asset inventory shows affected Fujitsu network driver use on critical systems. No source provided evidence of active exploitation or high-impact compromise, but kernel crash risk still matters for availability-sensitive hosts.

Technical view

The issue is in fmvj18x_get_hwinfo() under Linux net:fujitsu. The fix checks the ioremap return value and returns an error when mapping fails. Affected Linux versions are listed in the CVE bundle, with multiple stable-branch commits referenced as fixes.

Likely exposure

Exposure appears limited to Linux systems running affected kernels where the Fujitsu fmvj18x network driver code is present or used. The source bundle does not establish internet exposure, default reachability, or affected distribution package status.

Exploitation context

The CVE is not listed as KEV in the provided bundle, and no cited source states active exploitation. The described failure condition is a potential null pointer dereference after ioremap failure, which suggests availability risk rather than confirmed data compromise.

Researcher notes

The public record is sparse: no CVSS, CWE, exploit status, or detailed attack preconditions are provided. Analysis should focus on kernel version lineage, driver reachability, distribution backports, and whether the fmvj18x hardware-info path can be exercised in deployed environments.

Mitigation direction

  • Update affected Linux kernels using vendor-supported packages or referenced stable fixes.
  • Prioritize systems using Fujitsu fmvj18x network driver functionality.
  • Check Linux distribution advisories for backported fixes and package-specific version mapping.
  • If immediate patching is impossible, consult vendor guidance before changing driver configuration.

Validation and detection

  • Inventory Linux kernel versions against the affected version list in the CVE bundle.
  • Confirm whether Fujitsu fmvj18x network driver code is present or loaded.
  • Verify kernel source or package changelog includes one of the referenced stable fixes.
  • Track vendor advisories for distribution-specific fixed builds and reboot requirements.
Prepared
Confidence
medium
Sources
10

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-2021-47149 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
9Source 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
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2unaffected
LinuxLinux2.6.12, 0, 4.4.271, 4.9.271, 4.14.235, 4.19.193, 5.4.124, 5.10.42, 5.12.9, 5.13affected
Weakness

CWE details

No CWE listed

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