Linux kernel 3.12.49 LTS adds multiple improvements to the PowerPC (PPC), ARM64 (AArch64), ARM, PA-RISC, x86, and Xtensa hardware architectures, addresses many issues with the Btrfs, EXT4, HFS, HFS+, and NFS filesystems, adds some minor sound improvements, and many networking enhancements, especially for things like IPv6, mac80211, NetLink, Open vSwitch, and Stream Control Transmission Protocol (SCTP).