This vulnerability (CVE-2026-21373) involves a buffer over-read (CWE-126) caused by improper validation of an output buffer's size during IOCTL processing in Qualcomm Snapdragon products. The flaw allows memory corruption, potentially leading to high impact on confidentiality, integrity, and availability. Affected products include multiple Snapdragon mobile and compute platforms, FastConnect modules, and other Qualcomm components. The CVSS v3.1 base score is 7.8, indicating high severity. No vendor advisory or patch information is currently available, and no known exploits have been reported.

Successful exploitation of this vulnerability could result in memory corruption that compromises confidentiality, integrity, and availability of the affected device. This may allow an attacker with limited privileges (local access required) to read beyond the intended buffer boundaries, potentially exposing sensitive information or causing system instability or crashes.

Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until an official fix is available, limit access to affected devices and restrict local user privileges to reduce risk. Monitor Qualcomm's advisories for updates on patches or mitigations.