Security readout for executives and security teams
Plain-English summary
CVE-2018-9439 is an Android kernel flaw that could let a local attacker with some existing privileges escalate to higher system-level control. It does not require user interaction, but it is not remotely exploitable according to the supplied CVSS data.
Executive priority
Treat as high priority for Android fleets, especially older or unsupported devices. The business urgency comes from potential local privilege escalation to system-level impact, not from confirmed active exploitation or remote reachability in the supplied sources.
Technical view
The issue is a use-after-free in Android kernel af_packet.c, specifically __unregister_prot_hook and packet_release, caused by improper locking. CVSS 3.1 is 7.8: local vector, low complexity, low privileges required, no user interaction, with high confidentiality, integrity, and availability impact.
Likely exposure
Exposure is most relevant to Android devices using affected kernel code referenced by Google's Pixel August 2018 security bulletin. The supplied data does not identify exact device models, kernel versions, or OEM patch boundaries beyond Android Kernel.
Exploitation context
The source bundle does not show CISA KEV listing or other evidence of active exploitation. Exploitation requires local access and existing low privileges, with no user interaction. Do not treat it as internet-routable based on the supplied evidence.
Researcher notes
Evidence is limited to the CVE record, CVE List JSON, and Google's Pixel bulletin reference. The root cause is improper locking leading to CWE-416 use-after-free in af_packet.c. Further triage should use vendor patch metadata, not assumptions about all Linux kernels.
Mitigation direction
- Review Google's Pixel August 2018 bulletin and relevant OEM advisories.
- Apply vendor-provided Android kernel or firmware security updates where applicable.
- Prioritize devices with delayed or unsupported Android security patch levels.
- Restrict local code execution paths on unmanaged or high-risk Android devices.
- Check vendor guidance if no update is available for a device.
Validation and detection
- Inventory Android and Pixel devices in scope.
- Record each device model, kernel build, and Android security patch level.
- Compare patch status against Google's bulletin and OEM release notes.
- Confirm unsupported devices have compensating controls or replacement plans.
- Track CVE-2018-9439 in vulnerability management until evidence shows remediation.
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.
CWE-416: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-9439 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
- High
- CVSS
- 7.8 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H1.85.9Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
7.8HighVector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source materials
- CVE List V5 sourceCVE List V5
- https://source.android.com/security/bulletin/pixel/2018-08-01CVE reference
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.
Use After Free
Use After Free represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.