Updated kernel packages that fix multiple security issues and several bugs are now available for Red Hat Enterprise Linux 6. Red Hat Product Security has rated this update as having Important security impact. Common Vulnerability Scoring System base scores, which give detailed severity ratings, are available for each vulnerability from the CVE links in the References section. The kernel packages contain the Linux kernel, the core of any Linux operating system. * A flaw was found in the way the Linux kernel handled GS segment register base switching when recovering from a #SS fault on an erroneous return to user space. A local, unprivileged user could use this flaw to escalate their privileges on the system. * A flaw was found in the way the Linux kernel#39;s SCTP implementation handled malformed or duplicate Address Configuration Change Chunks . A remote attacker could use either of these flaws to crash the system. * A flaw was found in the way the Linux kernel#39;s SCTP implementation handled the association#39;s output queue. A remote attacker could send specially crafted packets that would cause the system to use an excessive amount of memory, leading to a denial of service. * A stack overflow flaw caused by infinite recursion was found in the way the Linux kernel#39;s UDF file system implementation processed indirect ICBs. An attacker with physical access to the system could use a specially crafted UDF image to crash the system. * It was found that the Linux kernel#39;s networking implementation did not correctly handle the setting of the keepalive socket option on raw sockets. A local user able to create a raw socket could use this flaw to crash the system. * It was found that the parse_rock_ridge_inode_internal function of the Linux kernel#39;s ISOFS implementation did not correctly check relocated directories when processing Rock Ridge child link tags. An attacker with physical access to the system could use a specially crafted ISO image to crash the system or, potentially, escalate their privileges on the system.