[RHSA-2014:0328] kernel security and bug fix update

The kernel packages contain the Linux kernel, the core of any Linux
operating system.

• A flaw was found in the way the get_rx_bufs() function in the vhost_net
  implementation in the Linux kernel handled error conditions reported by the
  vhost_get_vq_desc() function. A privileged guest user could use this flaw
  to crash the host. (CVE-2014-0055, Important)

• A flaw was found in the way the Linux kernel processed an authenticated
  COOKIE_ECHO chunk during the initialization of an SCTP connection. A remote
  attacker could use this flaw to crash the system by initiating a specially
  crafted SCTP handshake in order to trigger a NULL pointer dereference on
  the system. (CVE-2014-0101, Important)

• A flaw was found in the way the Linux kernel's CIFS implementation
  handled uncached write operations with specially crafted iovec structures.
  An unprivileged local user with access to a CIFS share could use this flaw
  to crash the system, leak kernel memory, or, potentially, escalate their
  privileges on the system. Note: the default cache settings for CIFS mounts
  on Red Hat Enterprise Linux 6 prohibit a successful exploitation of this
  issue. (CVE-2014-0069, Moderate)

• A heap-based buffer overflow flaw was found in the Linux kernel's cdc-wdm
  driver, used for USB CDC WCM device management. An attacker with physical
  access to a system could use this flaw to cause a denial of service or,
  potentially, escalate their privileges. (CVE-2013-1860, Low)

Red Hat would like to thank Nokia Siemens Networks for reporting
CVE-2014-0101, and Al Viro for reporting CVE-2014-0069.

This update also fixes several bugs. Documentation for these changes will
be available shortly from the Technical Notes document linked to in the
References section.

All kernel users are advised to upgrade to these updated packages, which
contain backported patches to correct these issues. The system must be
rebooted for this update to take effect.