A race condition was found in the kernel sound timer code in the snd_timer_user_read() function in the sound/core/timer.c file. An unprivileged attacker can exploit the race condition to cause out-of-bound access which may lead to a system crash or other unspecified impact. Due to the nature of the flaw, privilege escalation cannot be fully ruled out, although we believe it is unlikely. References: https://source.android.com/security/bulletin/pixel/2017-12-01#kernel-components Upstream fixes: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=c3b1681375dc6e71d89a3ae00cc3ce9e775a8917 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=4dff5c7b7093b19c19d3a100f8a3ad87cb7cd9e7