Red Hat Bugzilla – Bug 1288934
CVE-2015-7553 kernel: nfnetlink race in NETLINK_NFLOG socket creation
Last modified: 2018-02-07 18:09:41 EST
A race condition in netlink socket creation can trigger a kernel panic in netlink_release->module_put for local users creating netlink sockets.
This issue is specific to Red Hat Enterprise Linux and does not affect upstream kernels. This issue was introduced in commit 3500659804251facce0cf4ee2ca657e0108e9a4f. This was introduced in kernel-3.10.0-304.el7 in the fix titled:
[net] netfilter: log: protect nf_log_register against double registering.
It requires the nfnetlink_log module to be loaded to be effective.
This commit was introduced as part of a patchset that was required to backport netfilter functionality from upstream while attempting to maintain KABI. This flaw is RHEL specific.
This issue does not affect Red Hat Enterprise Linux 5 and 6.
This issue affects the Linux kernels as shipped with Red Hat Enterprise Linux 7, kernel-rt and Red Hat Enterprise MRG 2 and may be addressed in a future update.