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CVE Record

CVE-2021-47198: scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine

In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix use-after-free in lpfc_unreg_rpi() routine An error is detected with the following report when unloading the driver: "KASAN: use-after-free in lpfc_unreg_rpi+0x1b1b" The NLP_REG_LOGIN_SEND nlp_flag is set in lpfc_reg_fab_ctrl_node(), but the flag is not cleared upon completion of the login. This allows a second call to lpfc_unreg_rpi() to proceed with nlp_rpi set to LPFC_RPI_ALLOW_ERROR. This results in a use after free access when used as an rpi_ids array index. Fix by clearing the NLP_REG_LOGIN_SEND nlp_flag in lpfc_mbx_cmpl_fc_reg_login().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-47198 is a Linux kernel bug in the lpfc storage driver. Under a specific cleanup path, the driver can access memory after it has been freed, detected by KASAN while unloading the driver. The source does not provide a CVSS score, public exploit evidence, or a named workaround.

Executive priority

Handle through normal kernel patch governance, with higher priority for Fibre Channel storage servers. There is no source-backed evidence of active exploitation, but kernel memory-safety faults in storage paths can affect availability and operational stability.

Technical view

The lpfc Fibre Channel SCSI driver fails to clear NLP_REG_LOGIN_SEND after fabric controller login completion. A later lpfc_unreg_rpi() call can proceed with nlp_rpi set to LPFC_RPI_ALLOW_ERROR, causing use-after-free access when indexing rpi_ids. The listed fix clears the flag in lpfc_mbx_cmpl_fc_reg_login().

Likely exposure

Exposure is most plausible on Linux systems using the lpfc driver for Broadcom/Emulex Fibre Channel storage. The provided affected-version data references Linux 5.14, 5.15.5, and 5.16, but the exact range format is incomplete in the bundle.

Exploitation context

The provided sources do not show active exploitation, CISA KEV listing, exploit code, or a remote attack path. The observed failure occurred during driver unload. Treat exploitability beyond local or operational crash conditions as unproven from these sources.

Researcher notes

The bundle identifies the root cause and fix location but lacks CVSS, CWE, exploitability analysis, and precise affected-range semantics. Avoid assuming remote code execution or privilege escalation without additional vendor analysis.

Mitigation direction

  • Check distribution kernel advisories for CVE-2021-47198 fixes.
  • Update affected Linux kernels to builds containing the referenced stable commits.
  • Prioritize storage hosts using the lpfc driver.
  • Follow vendor guidance if kernel updates are not immediately available.

Validation and detection

  • Inventory hosts with the lpfc kernel module loaded or installed.
  • Map kernel versions against vendor advisories for CVE-2021-47198.
  • Confirm patched kernels include the referenced upstream stable fixes.
  • Review logs for KASAN or kernel errors mentioning lpfc_unreg_rpi.
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.

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CVE-2021-47198 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

CVECVE Program Container
CISA-ADPCISA ADP Vulnrichment
other:ssvc

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
LinuxLinuxfe83e3b9b422ac8ece2359c7b7290efe7f0335a2, fe83e3b9b422ac8ece2359c7b7290efe7f0335a2unaffected
LinuxLinux5.14, 0, 5.15.5, 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.