Available for Ubuntu 18.04 LTS (Bionic Beaver), Ubuntu 16.04 LTS (Xenial Xerus), and Ubuntu 14.04 LTS (Trusty Tahr), the new kernel live patch fixes a total of five security vulnerabilities, including the recently disclosed critical TCP flaw (CVE-2018-5390) discovered by Juha-Matti Tilli, which could allow a remote attacker to cause a denial of service. The rebootless kernel security patch also addresses a vulnerability (CVE-2018-13405) in the inode_init_owner function in fs/inode.c in the Linux kernel through 4.17.4 that could allow a local user to escalate his/her privileges by creating a file with an unintended group ownership and then make the file executable and SGID (Set Group ID).