A security issue was fixed in kernel 4.4-rc4 resolving the bypassing of filesystem permission checks in overlayfs during the initial copy_up. Upstream patch: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=acff81ec2c79492b180fade3c2894425cd35a545
Acknowledgements: Name: Nathan Williams
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1291332]
kernel-4.2.8-200.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
kernel-4.2.8-300.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.
Statement: 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 does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise MRG 2 as the due updates to fix this issue have been shipped now.
This issue was assigned CVE-2015-8660 as per: http://seclists.org/oss-sec/2015/q4/575
This issue has been addressed in the following products: MRG for RHEL-6 v.2 Via RHSA-2016:1532 https://rhn.redhat.com/errata/RHSA-2016-1532.html
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2016:1539 https://rhn.redhat.com/errata/RHSA-2016-1539.html
This issue has been addressed in the following products: Red Hat Enterprise Linux 7 Via RHSA-2016:1541 https://rhn.redhat.com/errata/RHSA-2016-1541.html