In all android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the linux kernel, there is a security concern with default privileged access to ADB and debug-fs.
source.codeaurora.org/quic/le/meta-qti-bsp/commit/?id=1dffcbf6fea3667a9a19dad70ddba12eff5ccbfb
source.codeaurora.org/quic/le/qti-conf/commit/?id=0eeb4558d541fac40b486a224eb6c601b64115a1
source.codeaurora.org/quic/le/qti-conf/commit/?id=fba5fe2ff19998db42acd4c39a6b02246e13bee0
www.codeaurora.org/security-bulletin/2018/11/05/november-2018-code-aurora-forum-security-bulletin