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CVE Record

CVE-2021-47143: net/smc: remove device from smcd_dev_list after failed device_add()

In the Linux kernel, the following vulnerability has been resolved: net/smc: remove device from smcd_dev_list after failed device_add() If the device_add() for a smcd_dev fails, there's no cleanup step that rolls back the earlier list_add(). The device subsequently gets freed, and we end up with a corrupted list. Add some error handling that removes the device from the list.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

A Linux kernel bug can corrupt an internal SMC-D device list when adding a device fails. The failed device is freed but remains linked in the list. The provided sources do not state severity, exploitability, business impact, or any observed attacks.

Executive priority

Handle through kernel patch management rather than emergency response unless internal evidence shows SMC-D use on exposed or high-criticality systems. The absence of severity, CVSS, and exploitation evidence lowers confidence in urgency, not in the existence of the bug.

Technical view

In net/smc, an smcd_dev was added to smcd_dev_list before device_add(). If device_add() failed, cleanup did not remove the list entry before freeing the device, leaving a corrupted list. The referenced stable commits add error handling to remove the device from the list.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions or commits that include this net/smc SMC-D error path. The bundle lists Linux 4.19, 5.10.42, 5.12.9, and 5.13 as affected, but gives incomplete version-range detail.

Exploitation context

No active exploitation is stated. The CVE is not marked KEV, and the provided sources do not describe a public exploit, trigger conditions, required privileges, or remote reachability. Treat exploitation context as incomplete.

Researcher notes

Evidence supports a cleanup flaw causing list corruption after device_add() failure. The bundle does not identify CWE, CVSS, attacker model, crashability, privilege requirements, or affected distribution packages. Avoid claiming denial of service or code execution without additional vendor evidence.

Mitigation direction

  • Apply Linux stable or distribution kernel updates containing the referenced fixes.
  • Check vendor kernel advisories for exact affected and fixed package versions.
  • Prioritize systems using affected Linux kernel branches or net/smc functionality.
  • Use normal maintenance controls where SMC-D is not present or used.

Validation and detection

  • Inventory Linux kernel versions across production and edge systems.
  • Confirm whether kernels include one of the referenced stable fix commits.
  • Check distribution changelogs for CVE-2021-47143 backports.
  • Review whether net/smc or SMC-D support is enabled on relevant systems.
Prepared
Confidence
medium
Sources
5

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-2021-47143 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
4Source 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
LinuxLinuxc6ba7c9ba43de1b57e9a53946e7ff988554c84ed, c6ba7c9ba43de1b57e9a53946e7ff988554c84ed, c6ba7c9ba43de1b57e9a53946e7ff988554c84edunaffected
LinuxLinux4.19, 0, 5.10.42, 5.12.9, 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.