CVE-2018-21069

Vulnerability

An issue was discovered on Samsung mobile devices with N(7.x) software (MediaTek chipsets), identified as SVE-2018-11852 (July 2018). The vulnerability resides in a MediaTek driver and leads to information disclosure of kernel stack memory [1]. The exact driver component and version are not specified in the available references, but the affected platform is Samsung devices running Android N (7.x) with MediaTek chipsets.

Exploitation

A local attacker on an affected device could exploit this vulnerability to read kernel stack memory. No special privileges beyond local access appear to be required, but the attacker must be able to interact with the vulnerable driver, likely through a system call or IOCTL. The exact steps required are not detailed in the references.

Impact

Successful exploitation results in the disclosure of kernel stack memory, which may contain sensitive information such as cryptographic keys, process credentials, or other kernel data. This could lead to further compromise of the device or user privacy. The impact is limited to information disclosure; no code execution or privilege escalation is indicated in the description.

Mitigation

Samsung has addressed this issue in a security update released as part of their monthly maintenance release (MMR) program. Users should apply the latest security patch from Samsung [1]. The specific patch date is not explicitly listed, but the vulnerability was reported in July 2018 and was likely fixed in a subsequent update. No workaround is available; applying the official firmware update is the recommended mitigation.