Security readout for executives and security teams
Plain-English summary
ACRN before 2.5 has a NULL pointer dereference in virtio queue handling. In business terms, this is primarily an availability concern for systems that rely on ACRN virtualization. The public bundle does not provide CVSS scoring, attack prerequisites, or evidence of exploitation.
Executive priority
Treat this as a targeted virtualization availability risk, not a confirmed emergency. Prioritize asset discovery and patch confirmation where ACRN supports production, embedded, or safety-relevant workloads.
Technical view
The issue is described in hw/pci/virtio/virtio.c, specifically vq_endchains. A NULL pointer dereference can cause erroneous memory access and likely process or component failure. The only cited fix evidence is an ACRN project commit and the version boundary of before 2.5.
Likely exposure
Exposure appears limited to environments running ACRN hypervisor versions before 2.5. The bundle does not identify downstream products, CPEs, guest-to-host reachability, or whether cloud, embedded, or appliance builds are affected.
Exploitation context
No active exploitation is supported by the provided sources. The CVE is not listed as KEV in the bundle, and no cited source describes public exploit activity, exploit reliability, or attacker prerequisites.
Researcher notes
Evidence is sparse. The record names ACRN before 2.5 and a specific source file/function, but lacks CVSS, CWE, affected CPEs, exploitability details, and downstream product mapping. Avoid inferring attack paths beyond the cited NULL pointer dereference.
Mitigation direction
- Inventory systems and products that run ACRN hypervisor.
- Upgrade ACRN deployments older than 2.5 after compatibility testing.
- Confirm downstream vendor builds include the referenced ACRN fix commit.
- Check Project ACRN or vendor guidance for supported patched releases.
- Prioritize systems where ACRN availability is operationally important.
Validation and detection
- Identify the installed ACRN version on each relevant system.
- Check whether source or build metadata includes commit 154fe59531c12b82e26d1b24b5531f5066d224f5.
- Review SBOMs or firmware manifests for ACRN components before 2.5.
- Look for crash reports referencing virtio, vq_endchains, or NULL pointer dereference.
- Document unknown downstream exposure where vendor evidence is unavailable.
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-2021-36143 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/commit/154fe59531c12b82e26d1b24b5531f5066d224f5CVE 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.