Security readout for executives and security teams
Plain-English summary
CVE-2021-36146 is a NULL pointer dereference in ACRN before 2.5, in the xHCI device model code. The public record is sparse, but the likely business concern is virtualization service stability rather than confirmed data theft or takeover.
Executive priority
Treat as a targeted virtualization maintenance item. Prioritize promptly for production systems using ACRN before 2.5, especially embedded or edge platforms where hypervisor crashes could disrupt operations.
Technical view
The issue is in ACRN devicemodel/hw/pci/xhci.c and involves a NULL trb pointer. Sources identify ACRN before 2.5 as affected, but do not provide CVSS, CWE, attack preconditions, privilege impact, or detailed affected configuration data.
Likely exposure
Exposure is most plausible in environments running ACRN hypervisor before version 2.5, especially where the xHCI device model is built, enabled, or reachable by guest workloads. The source bundle does not identify specific downstream products or CPEs.
Exploitation context
The CVE is not listed as KEV in the bundle, and no provided source states active exploitation. A public fix commit is referenced, but the bundle does not include exploit reports or weaponized proof-of-concept details.
Researcher notes
Evidence is limited to the CVE description and referenced commit. The bundle supports version boundary and vulnerable file location, but not precise reachability, guest privilege requirements, exploitability, or downstream vendor exposure.
Mitigation direction
- Inventory ACRN hypervisor versions across affected virtualization deployments.
- Upgrade ACRN to version 2.5 or later where applicable.
- Check ACRN project guidance for any configuration-specific remediation.
- Review whether xHCI device model functionality is required in production.
- Prioritize regression testing for guest USB and virtualization stability.
Validation and detection
- Confirm whether deployed ACRN versions are earlier than 2.5.
- Verify whether xHCI device model code is built or enabled.
- Confirm the referenced fix is present in deployed source or packages.
- Review crash telemetry for xHCI-related NULL dereference symptoms.
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-2021-36146 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/6173/commits/330359921e2e4c2f3f3a10b5bab86942d63c4428CVE 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.