The offset2lib patch as used by the Linux Kernel contains a vulnerability,
if RLIMIT_STACK is set to RLIM_INFINITY and 1 Gigabyte of memory is
allocated (the maximum under the 1/4 restriction) then the stack will be
grown down to 0x80000000, and as the PIE binary is mapped above 0x80000000
the minimum distance between the end of the PIE binary's read-write segment
and the start of the stack becomes small enough that the stack guard page
can be jumped over by an attacker. This affects Linux Kernel version
4.11.5. This is a different issue than CVE-2017-1000370 and
CVE-2017-1000365. This issue appears to be limited to i386 based systems.

It was discovered that the Linux kernel did not properly separate
a process' stack and its binary mapping in some situations. A local
attacker could use this to possibly execute arbitrary code.

 tyhicks> The original offset2lib issue was not assigned a CVE and the fix is
  only in 15.04 (Vivid) and newer kernels.