Security readout for executives and security teams
Plain-English summary
CVE-2021-39814 is an Android kernel issue in Pixel security bulletin context. The source describes an incorrect bounds check that may allow an out-of-bounds write and local privilege escalation. It requires local conditions and does not require user interaction. Public evidence provided does not show active exploitation.
Executive priority
Treat this as a patch compliance item for Android fleets, not an emergency exploitation event. Risk is higher where devices are unmanaged, outdated, or unable to receive OEM kernel updates.
Technical view
The flaw is in ppmp_validate_wsm in drm_fw.c. An incorrect bounds check may permit an out-of-bounds write. The CVE description states possible local escalation of privilege and notes System execution privileges are needed. No CVSS, CWE, affected device matrix, or exploit details are provided in the bundle.
Likely exposure
Exposure is limited to Android kernel builds covered by the April 2022 Pixel security bulletin reference. The bundle does not identify other vendors, exact kernel branches, or device models beyond Android kernel.
Exploitation context
The provided sources do not report exploitation in the wild, and the CVE is not listed as KEV. Exploitation is described as local, with no user interaction required, and with System execution privileges needed.
Researcher notes
Evidence is sparse: no CVSS, CWE, patch diff, affected kernel version range, or exploit status is included. Avoid assuming broad Android impact beyond the Android kernel and Pixel bulletin references provided.
Mitigation direction
- Review the April 2022 Pixel security bulletin for vendor guidance.
- Apply relevant Android or Pixel security updates where applicable.
- Prioritize managed devices that remain on pre-April 2022 patch levels.
- Check OEM advisories for device-specific kernel update availability.
Validation and detection
- Inventory Android devices and their security patch level.
- Identify devices covered by the April 2022 Pixel bulletin scope.
- Confirm whether kernel updates containing the vendor fix are installed.
- Track unsupported devices that cannot receive relevant security updates.
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-2021-39814 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.