This vulnerability (CVE-2026-21372) involves a heap-based buffer overflow (CWE-122) in Qualcomm Snapdragon and related platforms. The issue arises when IOCTL requests with invalid buffer sizes trigger unsafe memcpy operations, leading to memory corruption. Affected products include various Snapdragon mobile platforms, FastConnect modules, and Qualcomm Video Collaboration platforms. The CVSS 3.1 base score is 7.8, reflecting high impact on confidentiality, integrity, and availability. The vulnerability requires local access with low privileges and no user interaction. As of the published date, no official fix or patch has been released by Qualcomm.

Successful exploitation could lead to complete compromise of the affected device's memory, allowing an attacker to execute arbitrary code, cause denial of service, or escalate privileges. The vulnerability impacts confidentiality, integrity, and availability of the affected systems. However, exploitation requires local access with low privileges and no user interaction.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is released, restrict local access to trusted users and monitor for suspicious activity related to IOCTL requests. Avoid sending malformed IOCTL requests to affected devices. Follow Qualcomm's advisories for updates.