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Kernel stack information leak when processing audio ioctls (CVE-2016-6698)

Release Date:

November 11, 2016

Affected Projects:

Android for MSMFirefox OS for MSMQRD Android

Advisory ID:


CVE ID(s):



The following security vulnerabilities have been identified: CVE-2016-6698 There is a kernel stack information leak when processing audio ioctls in the audio driver. In case of AUDIO_GET_WMAPRO_CONFIG_32, wmapro_config_32 is on the stack. Due to alignment, the size of it is 24 bytes. The last 2 bytes are padding bytes which are not initialized and leaked to userland via “copy_to_user”.

Access Vector: Local
Security Risk: Medium
Access Vector: Local

Affected Versions:

All Android releases from CAF using the Linux kernel.


We advise customers to apply the following patches:

Individual Patches


This issue was reported to Google by an external security researcher. Qualcomm Innovation Center, Inc. (QuIC) thanks Google for bringing this issue to QuIC's attention.


Initial revision