I recently came to know that Qualcomm found some vulnerabilities in many chipsets that allow remote access to phone data and encryption keys including 835 n all. It also has 625 in the list . Qualcomm is rolling update to fix that . Lenovo will never provide the update and we are on custom ROMs , anyway to patch that update to our devices ?
https://app.beebom.com/qualcomm-patches-critical-flaw-dozens-snapdragon-socs
https://app.beebom.com/qualcomm-patches-critical-flaw-dozens-snapdragon-socs