RHSA-2016:1100: Important: kernel security, bug fix, and enhancement update

The kernel packages contain the Linux kernel, the core of any Linux operating system.Security Fix(es): Two flaws were found in the way the Linux kernel's networking implementation handled UDP packets with incorrect checksum values. A remote attacker could potentially use these flaws to trigger an infinite loop in the kernel, resulting in a denial of service on the system, or cause a denial of service in applications using the edge triggered epoll functionality. (CVE-2015-5364, CVE-2015-5366, Important) Bug Fix(es): In anonvma data structure, the degree counts number of child anonvmas and of VMAs that point to this anonvma. In the unlinkanonvma() function, when its list is empty, anonvma is going to be freed whether the external refcount is zero or not, so the parent's degree should be decremented. However, failure to decrement the degree triggered a BUGON() signal in unlinkanonvma(). The provided patch fixes this bug, and the degree is now decremented as expected. (BZ#1326027) Enhancement(s): The ixgbe NIC driver has been upgraded to upstream version 4.2.1, which provides a number of bug fixes and enhancements over the previous version. Notably: NULL pointer crashes related to VLAN support have been fixedTwo more devices from the Intel X550 Ethernet controller family are now supported: IDs 15AC and 15ADSeveral PHY-related problems have been addressed: link disruptions and link flappingAdded PHY-related support for Intel X550System performance has been improved(BZ#1315702)