K07020416 : Linux kernel vulnerability CVE-2017-18344

Security Advisory Description

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). (CVE-2017-18344)

Impact

A local attacker may use this vulnerability to expose sensitive information or cause a denial of service (DoS), making the system unresponsive.