Detections
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CVE-2017-18344
medium
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).
References
https://usn.ubuntu.com/3742-2/
https://usn.ubuntu.com/3742-1/
https://github.com/torvalds/linux/commit/cef31d9af908243421258f1df35a4a644604efbe
https://cdn.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.8
https://access.redhat.com/errata/RHSA-2018:3591
https://access.redhat.com/errata/RHSA-2018:3590
https://access.redhat.com/errata/RHSA-2018:3586
https://access.redhat.com/errata/RHSA-2018:3540
https://access.redhat.com/errata/RHSA-2018:3459
https://access.redhat.com/errata/RHSA-2018:3096
https://access.redhat.com/errata/RHSA-2018:3083
https://access.redhat.com/errata/RHSA-2018:2948