Security readout for executives and security teams
Plain-English summary
ACRN versions before 2.5 have a memory-safety flaw in the virtual device handling path. In practical terms, affected hypervisor deployments should be reviewed because bugs in virtualization components can threaten stability or isolation. The public bundle does not provide CVSS, detailed impact, or confirmed attack conditions.
Executive priority
Prioritize if your organization runs ACRN in production, embedded, edge, or IoT virtualization environments. If ACRN is not present, this CVE is unlikely to require action beyond inventory confirmation.
Technical view
The CVE describes a use-after-free in ACRN before 2.5 involving the polling timer handler and freed virtio devices in devicemodel/hw/pci/virtio/*.c. The available sources identify the vulnerable area and a related upstream commit, but do not document exploit prerequisites, attacker privileges, or complete impact.
Likely exposure
Exposure is likely limited to environments running ACRN hypervisor versions before 2.5, especially configurations using virtio device-model components. The CVE source does not enumerate downstream products, distributions, or CPEs.
Exploitation context
The source bundle does not cite active exploitation, public exploit availability, or KEV listing. Treat exploitation status as unconfirmed. The vulnerability class can involve crashes or memory corruption, but the provided sources do not prove a specific outcome.
Researcher notes
Evidence is sparse: no CVSS, CWE, affected CPEs, exploit status, or detailed advisory is included. Analysis should stay anchored to ACRN before 2.5 and the virtio polling timer use-after-free described by the CVE and referenced commit.
Mitigation direction
- Inventory ACRN hypervisor deployments and record exact versions.
- Upgrade ACRN deployments before 2.5 to 2.5 or later where applicable.
- Confirm the referenced upstream fix is included in packaged builds.
- Review vendor or distribution advisories for deployment-specific guidance.
- Restrict administrative access to hypervisor and guest configuration management.
Validation and detection
- Check whether any deployed ACRN version is earlier than 2.5.
- Confirm virtio device-model components are present or configured.
- Verify patched source or package includes the referenced commit lineage.
- Review crash logs for unexplained device-model or virtio timer failures.
- Document unsupported or unpatchable ACRN instances for risk acceptance.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
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
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-36144 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
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.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://github.com/projectacrn/acrn-hypervisor/pull/6268/commits/dd88504804e186029f845a166dc5c31695e2cca2CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.