RHSA-2014:0433: Moderate: 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 TCP/IP protocol suite implementation handled TCP packets with both the SYN and FIN flags set.A remote attacker could use this flaw to consume an excessive amount ofresources on the target system, potentially resulting in a denial ofservice. (CVE-2012-6638, Moderate) A flaw was found in the way the Linux kernel handled HID (Human Interface Device) reports with an out-of-bounds Report ID. An attacker with physicalaccess to the system could use this flaw to crash the system or,potentially, escalate their privileges on the system. (CVE-2013-2888,Moderate)This update also fixes the following bugs: A previous change to the sunrpc code introduced a race condition between the rpcwakeuptask() and rpcwakeupstatus() functions. A race betweenthreads operating on these functions could result in a deadlock situation,subsequently triggering a "soft lockup" event and rendering the systemunresponsive. This problem has been fixed by re-ordering tasks in the RPCwait queue. (BZ#1073731) Running a process in the background on a GFS2 file system could sometimes trigger a glock recursion error that resulted in a kernel panic.This happened when a readpage operation attempted to take a glock that hadalready been held by another function. To prevent this error, GFS2 nowverifies whether the glock is already held when performing the readpageoperation. (BZ#1073953) A previous patch backport to the IUCV (Inter User Communication Vehicle) code was incomplete. Consequently, when establishing an IUCV connection,the kernel could, under certain circumstances, dereference a NULL pointer,resulting in a kernel panic. A patch has been applied to correct thisproblem by calling the proper function when removing IUCV paths.(BZ#1077045)In addition, this update adds the following enhancement: The lpfc driver had a fixed timeout of 60 seconds for SCSI task management commands. With this update, the lpfc driver enables the user toset this timeout within the range from 5 to 180 seconds. The timeout canbe changed by modifying the "lpfctaskmgmttmo" parameter for the lpfcdriver. (BZ#1073123)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.