Security readout for executives and security teams
Plain-English summary
This Android kernel issue could allow a local attacker to gain higher privileges on an affected device. The public record is sparse: the component is listed as TBD, severity and CVSS are absent, and no user interaction is required.
Executive priority
Treat this as a patch hygiene issue for Android fleets. Urgency depends on device population and patch age, because the public data lacks severity scoring and exploit confirmation.
Technical view
CVE-2021-39812 describes a possible out-of-bounds read caused by a use-after-free in the Android kernel. The stated impact is local escalation of privilege with no additional execution privileges required. Android ID is A-205522359.
Likely exposure
Exposure is limited to Android devices with affected kernel builds. The source bundle does not identify specific device models, kernel branches, or OEM patch levels beyond Android kernel.
Exploitation context
The provided sources do not show active exploitation, public exploit availability, or KEV listing. Exploitation is described as local, not remote, and no user interaction is needed.
Researcher notes
Key details are missing: affected subsystem is TBD, CVSS is absent, CWE is absent, and references list no technical advisory beyond the Pixel bulletin. Avoid assuming exploitability across all Android kernels.
Mitigation direction
- Review the April 2022 Pixel security bulletin and applicable OEM guidance.
- Prioritize Android devices missing relevant April 2022 or later security updates.
- Apply vendor-approved Android security updates where available.
- Do not infer third-party product exposure without vendor confirmation.
Validation and detection
- Inventory Android devices and record OS security patch levels.
- Check whether managed devices received the relevant Android or OEM update.
- Review vulnerability management data for CVE-2021-39812 coverage.
- Confirm exceptions with vendor advisories or device OEM support channels.
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-2021-39812 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://source.android.com/security/bulletin/pixel/2022-04-01CVE 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.