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CVE Record

CVE-2021-47203: scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq()

In the Linux kernel, the following vulnerability has been resolved: scsi: lpfc: Fix list_add() corruption in lpfc_drain_txq() When parsing the txq list in lpfc_drain_txq(), the driver attempts to pass the requests to the adapter. If such an attempt fails, a local "fail_msg" string is set and a log message output. The job is then added to a completions list for cancellation. Processing of any further jobs from the txq list continues, but since "fail_msg" remains set, jobs are added to the completions list regardless of whether a wqe was passed to the adapter. If successfully added to txcmplq, jobs are added to both lists resulting in list corruption. Fix by clearing the fail_msg string after adding a job to the completions list. This stops the subsequent jobs from being added to the completions list unless they had an appropriate failure.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysismoderate

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel driver bug in the lpfc SCSI path. Under certain transmit queue failure handling, requests can be placed on conflicting lists, corrupting kernel list state. Business impact is most likely system instability or disruption on affected Linux hosts using this driver, not proven remote compromise.

Executive priority

Treat as a targeted reliability risk for Linux storage infrastructure rather than an internet-wide emergency. Patch during normal kernel maintenance, faster for systems using lpfc storage paths or showing related kernel instability.

Technical view

The flaw is in lpfc_drain_txq(). After one adapter submission failure, fail_msg remained set, so later jobs could be added to a cancellation completions list even when successfully added to txcmplq. The upstream fix clears fail_msg after adding a failed job to the completions list.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions and using the lpfc SCSI driver code path. The CVE record lists Linux kernel versions and stable fix commits, but does not provide a complete distro-by-distro affected matrix.

Exploitation context

The supplied sources do not show active exploitation, public exploit code, or KEV listing. The described condition is driver-internal list corruption during transmit queue draining after adapter submission failure, so validation should focus on kernel version, driver use, and vendor backports.

Researcher notes

Evidence is limited to the CVE description and kernel stable commit references. No CVSS, CWE, exploitability details, or distro impact matrix is provided in the bundle. The key fix behavior is clearing fail_msg to prevent later successful jobs from being double-listed.

Mitigation direction

  • Apply a vendor-supported kernel update containing the referenced stable fix.
  • Check Linux distribution advisories for backported fixes matching CVE-2021-47203.
  • Prioritize hosts using lpfc-backed SCSI storage paths.
  • Avoid ad hoc kernel patches outside supported vendor guidance.

Validation and detection

  • Inventory Linux kernel versions across storage-connected hosts.
  • Check whether the lpfc driver is present and loaded.
  • Compare installed kernels against vendor advisories for CVE-2021-47203.
  • Review kernel logs for lpfc errors or list corruption symptoms.
  • Confirm patched kernels include the upstream stable fix or vendor backport.
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

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CVE-2021-47203 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
LinuxLinux2a9bf3d011303d8da64cd5e0e7fdd95f0c143984, 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984, 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984, 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984, 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984, 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984, 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984, 2a9bf3d011303d8da64cd5e0e7fdd95f0c143984unaffected
LinuxLinux2.6.36, 0, 4.4.293, 4.9.291, 4.14.256, 4.19.218, 5.4.162, 5.10.82, 5.15.5, 5.16affected
Weakness

CWE details

No CWE listed

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