It was found that there was missing the check of the length of the passed sockaddr in pptp_bind() and pptp_connect() functions, copying out more kernel memory than required, leaking information from the kernel stack, including kernel addresses. This can be used for kernel ASLR bypassing or other information leaks.
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1292047]
kernel-4.3.3-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 as the code with the flaw is not present in the products listed.
This issue affects the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and MRG-2. This has been rated as having Low security impact and is not currently planned to be addressed in future updates. For additional information, refer to the Red Hat Enterprise Linux Life Cycle: https://access.redhat.com/support/policy/updates/errata/.
kernel-4.3.4-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.