Security readout for executives and security teams
Plain-English summary
This is a Qualcomm-related Android kernel issue where firmware-provided data can cause the Wi-Fi subsystem to read outside an expected array. Public sources tie exposure to CAF-based Android releases before the 2018-04-05 security patch level. Severity and business impact are not scored in the provided sources.
Executive priority
Handle as a legacy mobile platform patching concern, not an emergency based on current evidence. The main risk is unmanaged or unsupported Qualcomm-based devices remaining below the April 2018 Android security patch level.
Technical view
In wma_wow_wakeup_host_event(), wake_info->vdev_id is received from firmware and used directly as an index into wma->interfaces. If vdev_id is greater than or equal to max_bssid, an out-of-bounds read occurs. The CVE covers Qualcomm Android for MSM, Firefox OS for MSM, and QRD Android CAF Linux kernel releases before 2018-04-05.
Likely exposure
Likely exposure is legacy or unpatched Qualcomm MSM, QRD, Firefox OS for MSM, or CAF-derived Android devices below the 2018-04-05 security patch level. The source bundle does not provide CPEs, device models, affected chipsets, or OEM-specific build identifiers.
Exploitation context
The source bundle does not show active exploitation, public exploit availability, or CISA KEV listing. The bug depends on firmware-provided vdev_id reaching vulnerable kernel logic. Treat exploitability as unconfirmed from the provided evidence.
Researcher notes
Key missing data includes CVSS, CWE, affected chipset list, exact kernel commits, OEM advisories, and exploitability analysis. The public description is specific about the vulnerable function and bounds condition but incomplete for precise fleet risk scoring.
Mitigation direction
- Update affected devices to Android security patch level 2018-04-05 or later.
- Check OEM and Qualcomm guidance for device-specific fixed builds.
- Retire unsupported devices that cannot receive vendor security updates.
- Prioritize managed Qualcomm-based Android fleets with old security patch levels.
Validation and detection
- Inventory Android and CAF-derived devices using Qualcomm MSM or QRD platforms.
- Check each device security patch level against 2018-04-05.
- Review OEM firmware release notes for CVE-2018-5821 coverage.
- Confirm unsupported or legacy Firefox OS for MSM assets are removed or isolated.
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-2018-5821 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/2018-04-01CVE reference · x_refsource_CONFIRM
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.