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.
Name: Qualys Inc
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1462829]
This issue does not affect the Linux kernel packages as shipped with Red Hat
Enterprise Linux 7, MRG-2 and realtime kernels.
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6.
Future Linux kernel updates for the respective releases may address this issue.
This issue has been addressed in the following products:
Red Hat Enterprise Linux 6
Via RHSA-2020:1524 https://access.redhat.com/errata/RHSA-2020:1524
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):