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CVE Record

CVE-2021-47104: IB/qib: Fix memory leak in qib_user_sdma_queue_pkts()

In the Linux kernel, the following vulnerability has been resolved: IB/qib: Fix memory leak in qib_user_sdma_queue_pkts() The wrong goto label was used for the error case and missed cleanup of the pkt allocation. Addresses-Coverity-ID: 1493352 ("Resource leak")

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 memory leak in the qib InfiniBand driver. The source says an error path skipped cleanup for an allocated packet. Business risk depends on whether affected systems use this driver and kernel line; no severity score or active exploitation evidence is provided.

Executive priority

Treat this as a targeted kernel maintenance item, not an emergency, unless critical infrastructure uses qib InfiniBand on affected kernels. The absence of severity and exploitation evidence lowers urgency, but kernel memory leaks can affect availability if reachable.

Technical view

CVE-2021-47104 fixes a resource leak in qib_user_sdma_queue_pkts() in Linux IB/qib. The bug used the wrong goto label on an error path, missing pkt allocation cleanup. Upstream stable commits are referenced for multiple kernel branches, but the bundle provides no CVSS, CWE, or exploitability detail.

Likely exposure

Exposure appears limited to Linux systems running affected kernel versions or commits with the IB/qib driver path present. Environments without qib InfiniBand hardware or driver use are likely less exposed, but the source bundle does not define runtime prerequisites.

Exploitation context

The bundle does not report public exploitation, KEV listing, exploit code, or a demonstrated attack path. The described issue is a memory leak found by Coverity, so impact should be validated against actual driver reachability and workload conditions.

Researcher notes

Evidence is limited to the CVE record and Linux stable fix references. The root cause is a missed cleanup on an error path. Do not infer privilege requirements, triggerability, denial-of-service severity, or exploitability beyond what the sources state.

Mitigation direction

  • Update affected Linux kernels to builds containing the referenced stable fixes.
  • Use distribution vendor advisories to identify fixed package versions.
  • Prioritize systems with qib InfiniBand hardware or driver usage.
  • If immediate patching is constrained, request vendor-supported mitigation guidance.

Validation and detection

  • Inventory Linux kernel versions across servers and appliances.
  • Check whether the qib InfiniBand driver is present or enabled.
  • Map deployed kernels against the affected versions and fixed commits.
  • Confirm vendor kernel packages include the upstream stable fix.
  • Monitor for memory-pressure symptoms on potentially affected qib systems.
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-2021-47104 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
LinuxLinuxbda41654b6e0c125a624ca35d6d20beb8015b5d0, 3f57c3f67fd93b4da86aeffea1ca32c484d054ad, 60833707b968d5ae02a75edb7886dcd4a957cf0d, 73d2892148aa4397a885b4f4afcfc5b27a325c42, 0f8cdfff06829a0b0348b6debc29ff6a61967724, c3e17e58f571f34c51aeb17274ed02c2ed5cf780, d39bf40e55e666b5905fdbd46a0dced030ce87be, d39bf40e55e666b5905fdbd46a0dced030ce87be, 0d4395477741608d123dad51def9fe50b7ebe952unaffected
LinuxLinux5.15, 0, 4.4.297, 4.9.295, 4.14.260, 4.19.223, 5.4.169, 5.10.89, 5.15.12, 5.16affected
Weakness

CWE details

No CWE listed

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