Out-of-Bounds Access Vulnerability in Linux Kernel's timer_create Syscall Implementation

CVE-2017-18344 · LOW Severity

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

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).

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