It was found that in Linux kernel when peeling off an association to the socket in another network namespace, all transports in this association are not to be rehashed and keep use the old key in hashtable. A kernel would miss removing transports from hashtable when closing the socket and all transports are being freed. Later on a use-after-free issue could be caused when looking up an association and dereferencing the transports.
An upstream patch:
Name: ChunYu Wang (Red Hat)
Created kernel tracking bugs for this issue:
Affects: fedora-all [bug 1513346]
This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5 and 6 as a code with the flaw is not present in the products listed.
This issue affects the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 7 and Red Hat Enterprise 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/.