Linux kernel is vulnerable to denial of service(DoS) attacks. An attacker could exploit a flaw in the XFS_IS_REALTIME_INODE macro in fs/xfs/xfs_linux.h. This allows local users to cause null pointer dereference.
git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=b31ff3cdf540110da4572e3e29bd172087af65cc
seclists.org/oss-sec/2017/q3/436
www.debian.org/security/2017/dsa-3981
www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.13.2
www.securityfocus.com/bid/100851
access.redhat.com/errata/RHSA-2017:2918
access.redhat.com/security/updates/classification/#important
bugzilla.redhat.com/show_bug.cgi?id=1489085
bugzilla.redhat.com/show_bug.cgi?id=1491344
github.com/torvalds/linux/commit/b31ff3cdf540110da4572e3e29bd172087af65cc