UBUNTU-CVE-2017-18344

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UBUNTU-CVE-2017-18344

Summary:

Details: The timer_create syscall implementation in kernel/time/posix-timers.c in the Linux kernel before 4.14.8 doesn't properly validate the sigevent->sigev_notify field, which leads to out-of-bounds access in the show_timer function (called when /proc/$PID/timers is read). This allows userspace applications to read arbitrary kernel memory (on a kernel built with CONFIG_POSIX_TIMERS and CONFIG_CHECKPOINT_RESTORE).

References: https://ubuntu.com/security/CVE-2017-18344, https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8, https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe, http://www.openwall.com/lists/oss-security/2018/08/09/6, https://ubuntu.com/security/notices/USN-3742-1, https://ubuntu.com/security/notices/USN-3742-2, https://www.cve.org/CVERecord?id=CVE-2017-18344