A flaw was found in the Linux kernels implementation of Unix sockets. A server polling for data coming from a client socket may put the peer socket on a wait list. This peer may close the connection making the reference on the wait list no longer valid. This could lead to bypssing the permissions on a unix socket, and packets being injected into the stream. This may also panic the machine. Additional resources: https://groups.google.com/forum/#!topic/syzkaller/3twDUI4Cpm8 http://seclists.org/oss-sec/2015/q4/321 https://git.kernel.org/cgit/linux/kernel/git/davem/net.git/commit/?id=7d267278a9ece963d77eefec61630223fce08c6c
Created kernel tracking bugs for this issue: Affects: fedora-all [bug 1282712]
*** Bug 1273845 has been marked as a duplicate of this bug. ***
Statement: This issue does not affect Linux kernels as shipped with Red Hat Enterprise linux 5,7, MRG-2 and realtime kernels. This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 6 and may be addressed in a future update. This has been rated as having Moderate 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-4.2.8-200.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.