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CVE Record

CVE-2021-47319: virtio-blk: Fix memory leak among suspend/resume procedure

In the Linux kernel, the following vulnerability has been resolved: virtio-blk: Fix memory leak among suspend/resume procedure The vblk->vqs should be freed before we call init_vqs() in virtblk_restore().

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

This is a Linux kernel memory leak in the virtio-blk suspend/resume path. Repeated resume operations could leave allocated queue memory behind. The sources do not provide CVSS, confirmed impact severity, or evidence of active exploitation.

Executive priority

Handle through normal kernel patch management unless internal systems rely heavily on virtio-blk suspend/resume. There is no sourced evidence here of active exploitation or critical business urgency.

Technical view

The fix frees vblk->vqs before init_vqs() is called in virtblk_restore(). The affected component is Linux virtio-blk, with affected kernel version entries listed by the CVE record and stable kernel fix commits referenced.

Likely exposure

Exposure is most likely on Linux systems using virtio-blk where suspend/resume is exercised. The source bundle does not identify specific distributions, cloud providers, or appliance products.

Exploitation context

The provided sources do not state active exploitation, public exploit availability, or KEV listing. Treat this as a kernel maintenance exposure until vendor guidance clarifies operational impact.

Researcher notes

Evidence supports a resolved memory leak in virtblk_restore(), but the bundle lacks CVSS, CWE, exploitability analysis, and distribution-specific fixed package mapping. Do not infer broader product exposure beyond Linux virtio-blk.

Mitigation direction

  • Apply vendor kernel updates that include the referenced stable kernel fixes.
  • Prioritize Linux hosts using virtio-blk with suspend/resume workflows.
  • Check distribution advisories before assuming a specific package is affected.
  • Avoid direct kernel deployment shortcuts; follow normal tested patch rollout.

Validation and detection

  • Inventory running kernel versions against vendor fixed builds and CVE affected entries.
  • Confirm whether virtio-blk devices or modules are present on relevant Linux systems.
  • Review vendor changelogs for the virtio-blk suspend/resume memory leak fix.
  • After patching, run suspend/resume regression checks and monitor memory stability.
Prepared
Confidence
medium
Sources
11

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-2021-47319 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
10Source 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
LinuxLinux6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08, 6a27b656fc0210e976db362e1368c56db05c8f08unaffected
LinuxLinux3.17, 0, 4.4.276, 4.9.276, 4.14.240, 4.19.198, 5.4.134, 5.10.52, 5.12.19, 5.13.4, 5.14affected
Weakness

CWE details

No CWE listed

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