Security readout for executives and security teams
Plain-English summary
CVE-2021-39815 is an Android SoC issue in the PowerVR GPU driver. An ordinary app could misuse pinned GPU memory after unpinning it, leading to kernel memory corruption. That makes affected Android devices a concern even without special app privileges, but the public bundle does not provide CVSS, affected device models, or confirmed exploitation.
Executive priority
Treat this as a high-priority mobile patching issue for Android fleets with possible PowerVR GPU exposure. Business urgency is driven by no-required-privilege local attack surface and kernel memory corruption, but exact fleet impact depends on OEM hardware and patch status.
Technical view
The issue is a use-after-unpin style memory handling flaw in the PowerVR GPU driver. Unprivileged apps can allocate pinned memory, unpin it so it may be freed, then continue using the page in GPU calls, resulting in kernel memory corruption. The Android ID is A-232440670.
Likely exposure
Exposure is limited to Android SoC devices using the affected PowerVR GPU driver. The bundle does not identify device models, OEMs, chipsets, or exact Android releases beyond Android SoC.
Exploitation context
No CISA KEV listing is reported, and the provided sources do not cite active exploitation or public exploit availability. The source description indicates local attack surface through an unprivileged Android app, with kernel memory corruption as the impact.
Researcher notes
Evidence is sparse: no CVSS, CWE, affected models, exploit status, or fix commit is included in the bundle. Analysis should stay tied to Android bulletin data, Android ID A-232440670, and OEM confirmation for specific devices.
Mitigation direction
- Apply relevant Android Security Bulletin and OEM firmware updates.
- Prioritize devices with PowerVR GPU drivers or affected Android SoCs.
- Check vendor advisories for model-specific fix availability.
- Retire or isolate unsupported devices that cannot receive updates.
- Restrict installation of untrusted Android apps where patching is delayed.
Validation and detection
- Inventory Android devices by SoC and GPU vendor.
- Confirm vendor patch level includes the August 2022 Android security fixes.
- Review OEM advisories for CVE-2021-39815 or A-232440670 coverage.
- Check mobile device management reports for unsupported Android builds.
- Track exceptions for devices without confirmed patch availability.
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-2021-39815 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/2022-08-01CVE 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.