Double-Free and Use-After-Free Vulnerabilities in Android for MSM, Firefox OS for MSM, QRD Android

CVE-2017-9687 · MEDIUM Severity

AV:L/AC:L/AU:N/C:P/I:P/A:P

In Android for MSM, Firefox OS for MSM, QRD Android, with all Android releases from CAF using the Linux kernel, two concurrent threads/processes can write the value of "0" to the debugfs file that controls ipa ipc log which will lead to the double-free in ipc_log_context_destroy(). Another issue is the Use-After-Free which can happen due to the race condition when the ipc log is deallocated via the debugfs call during a log print.

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