Security readout for executives and security teams
Plain-English summary
This flaw affects Qualcomm CAF-based Android/Linux builds. A value received from firmware is not bounded before being used, which can overwrite memory in a fixed-size Wi-Fi-related structure. The source bundle does not provide severity, CVSS, exploitation evidence, or a confirmed fix.
Executive priority
Treat this as an exposure-mapping and vendor-update item for Qualcomm-based mobile or embedded fleets. Urgency cannot be rated from the supplied evidence, but unsupported affected devices should be handled as elevated operational risk.
Technical view
CVE-2018-5843 is in wma_pdev_div_info_evt_handler(). event->num_chains_valid from firmware lacks an upper-bound check, allowing overwrite of the fixed-size chain_rssi_result structure in affected CAF Android releases using the Linux kernel.
Likely exposure
Exposure is most likely in devices built from Qualcomm CAF Android for MSM, Firefox OS for MSM, or QRD Android Linux-kernel releases. Actual exposure depends on OEM source lineage, chipset support packages, and whether vendor updates incorporated the relevant fix.
Exploitation context
The provided sources do not cite public exploitation, and KEV status is false. The described primitive is a buffer overwrite from firmware-provided data, but the bundle does not establish reachability, attacker prerequisites, or practical exploitability.
Researcher notes
The key issue is missing validation of event->num_chains_valid before writing into chain_rssi_result. The bundle lacks CVSS, CWE, exploit status, and patch details, so avoid stronger claims until vendor bulletin or OEM source confirms them.
Mitigation direction
- Check the Code Aurora May 2018 bulletin for vendor guidance.
- Apply OEM or Qualcomm updates only where they identify applicability.
- Inventory CAF-derived Android/Linux device builds in your fleet.
- Retire or isolate unsupported devices that cannot receive vendor fixes.
Validation and detection
- Map devices to Qualcomm CAF, QRD, or Android for MSM code lineage.
- Review vendor advisories for CVE-2018-5843 applicability.
- Confirm whether wma_pdev_div_info_evt_handler() includes a bounds check.
- Record unsupported affected builds as residual risk.
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-2018-5843 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://www.codeaurora.org/security-bulletin/2018/05/11/may-2018-code-aurora-security-bulletin-2CVE 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.