RHSA-2015:0062: Important: kernel security, bug fix, and enhancement update

The kernel packages contain the Linux kernel, the core of any Linuxoperating system. A flaw was found in the way the Linux kernel's SCTP implementation handled malformed or duplicate Address Configuration Change Chunks(ASCONF). A remote attacker could use either of these flaws to crash thesystem. (CVE-2014-3673, CVE-2014-3687, Important) A flaw was found in the way the Linux kernel's SCTP implementation handled the association's output queue. A remote attacker could sendspecially crafted packets that would cause the system to use an excessiveamount of memory, leading to a denial of service. (CVE-2014-3688,Important) A flaw was found in the way the Linux kernel's VFS subsystem handled reference counting when performing unmount operations on symbolic links.A local, unprivileged user could use this flaw to exhaust all availablememory on the system or, potentially, trigger a use-after-free error,resulting in a system crash or privilege escalation. (CVE-2014-5045,Moderate) An integer overflow flaw was found in the way the lzo1xdecompresssafe() function of the Linux kernel's LZO implementation processed Literal Runs.A local attacker could, in extremely rare cases, use this flaw to crash thesystem or, potentially, escalate their privileges on the system.(CVE-2014-4608, Low)Red Hat would like to thank Vasily Averin of Parallels for reportingCVE-2014-5045, and Don A. Bailey from Lab Mouse Security for reportingCVE-2014-4608. The CVE-2014-3673 issue was discovered by Liu Wei ofRed Hat.This update also fixes several bugs and adds one enhancement.Documentation for these changes is available from the Technical Notesdocument linked to in the References section.All kernel users are advised to upgrade to these updated packages, whichcontain backported patches to correct these issues and add thisenhancement. The system must be rebooted for this update to take effect.