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CVE Record

CVE-2021-36147: An issue was discovered in ACRN before 2.5.

An issue was discovered in ACRN before 2.5. It allows a devicemodel/hw/pci/virtio/virtio_net.c virtio_net_ping_rxq NULL pointer dereference for vq->used.

UnknownCVSS not scoredNot KEV-listedUpdated
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Glexia's TakeAutomated analysisunknown

Security readout for executives and security teams

Plain-English summary

CVE-2021-36147 is a reported ACRN hypervisor issue affecting versions before 2.5. It involves a null pointer dereference in virtio network device-model handling. The available public record does not provide CVSS scoring, confirmed exploitation, or detailed impact, so treat this as an exposure-verification and upgrade-priority item rather than a confirmed emergency.

Executive priority

Prioritize if ACRN is used in production, embedded, edge, or virtualization environments. There is no cited active exploitation or severity score, but hypervisor reliability issues can affect operational continuity. If ACRN is not present, no action is required beyond documenting non-exposure.

Technical view

The CVE describes a NULL pointer dereference in ACRN devicemodel/hw/pci/virtio/virtio_net.c, specifically virtio_net_ping_rxq handling of vq->used. Affected scope is stated as ACRN before 2.5. The provided sources do not define a CWE, CVSS vector, exploitability prerequisites, or complete remediation notes beyond the version boundary and referenced upstream commit.

Likely exposure

Likely exposure is limited to environments running ACRN hypervisor versions before 2.5, especially where the virtio network device model is in use. The source bundle does not identify CPEs, downstream packages, appliances, or managed products, so asset inventory confirmation is required.

Exploitation context

The source bundle does not show active exploitation, public exploit availability, or CISA KEV listing. Based on the description, the plausible impact is reliability disruption through a null pointer dereference, but trigger conditions and privilege requirements are not documented in the provided sources.

Researcher notes

Evidence is sparse. The CVE record names ACRN before 2.5 and a specific virtio_net.c null pointer dereference, with one upstream commit reference. Missing details include CVSS, CWE, attack preconditions, reachable interfaces, and downstream advisory coverage. Avoid assuming broader virtualization-platform exposure.

Mitigation direction

  • Identify any ACRN hypervisor deployments and record installed versions.
  • Prioritize upgrading ACRN deployments before 2.5 to 2.5 or later.
  • Review the referenced upstream commit and vendor guidance before production changes.
  • Reduce exposure of guest or workload paths that rely on vulnerable virtio networking where practical.

Validation and detection

  • Check asset inventory for ACRN hypervisor usage and version below 2.5.
  • Confirm whether virtio network device model functionality is enabled or required.
  • Review change records for the referenced upstream fix or an equivalent downstream backport.
  • Document systems where version, patch, or backport status cannot be verified.
Prepared
Confidence
medium
Sources
3

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-2021-36147 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
0Timeline events
0ADP providers
2Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus
n/an/an/aListed
Weakness

CWE details

No CWE listed

CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.