(RHSA-2013:1264) Important: kernel-rt security and bug fix update

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

This update fixes the following security issues:

• A heap-based buffer overflow flaw was found in the Linux kernel’s iSCSI
  target subsystem. A remote attacker could use a specially-crafted iSCSI
  request to cause a denial of service on a system or, potentially, escalate
  their privileges on that system. (CVE-2013-2850, Important)

• A flaw was found in the Linux kernel’s Performance Events implementation.
  On systems with certain Intel processors, a local, unprivileged user could
  use this flaw to cause a denial of service by leveraging the perf subsystem
  to write into the reserved bits of the OFFCORE_RSP_0 and OFFCORE_RSP_1
  model-specific registers. (CVE-2013-2146, Moderate)

• An invalid pointer dereference flaw was found in the Linux kernel’s
  TCP/IP protocol suite implementation. A local, unprivileged user could use
  this flaw to crash the system or, potentially, escalate their privileges on
  the system by using sendmsg() with an IPv6 socket connected to an IPv4
  destination. (CVE-2013-2232, Moderate)

• Two flaws were found in the way the Linux kernel’s TCP/IP protocol suite
  implementation handled IPv6 sockets that used the UDP_CORK option. A local,
  unprivileged user could use these flaws to cause a denial of service.
  (CVE-2013-4162, CVE-2013-4163, Moderate)

• A flaw was found in the Linux kernel’s Chipidea USB driver. A local,
  unprivileged user could use this flaw to cause a denial of service.
  (CVE-2013-2058, Low)

• Information leak flaws in the Linux kernel could allow a privileged,
  local user to leak kernel memory to user-space. (CVE-2013-2147,
  CVE-2013-2164, CVE-2013-2234, CVE-2013-2237, Low)

• Information leak flaws in the Linux kernel could allow a local,
  unprivileged user to leak kernel memory to user-space. (CVE-2013-2141,
  CVE-2013-2148, Low)

• A format string flaw was found in the Linux kernel’s block layer. A
  privileged, local user could potentially use this flaw to escalate their
  privileges to kernel level (ring0). (CVE-2013-2851, Low)

• A format string flaw was found in the b43_do_request_fw() function in the
  Linux kernel’s b43 driver implementation. A local user who is able to
  specify the “fwpostfix” b43 module parameter could use this flaw to cause a
  denial of service or, potentially, escalate their privileges.
  (CVE-2013-2852, Low)

• A NULL pointer dereference flaw was found in the Linux kernel’s ftrace
  and function tracer implementations. A local user who has the CAP_SYS_ADMIN
  capability could use this flaw to cause a denial of service.
  (CVE-2013-3301, Low)

Red Hat would like to thank Kees Cook for reporting CVE-2013-2850,
CVE-2013-2851, and CVE-2013-2852; and Hannes Frederic Sowa for reporting
CVE-2013-4162 and CVE-2013-4163.

This update also fixes the following bugs:

• The following drivers have been updated, fixing a number of bugs:
  myri10ge, bna, enic, mlx4, bgmac, bcma, cxgb3, cxgb4, qlcnic, r8169,
  be2net, e100, e1000, e1000e, igb, ixgbe, brcm80211, cpsw, pch_gbe,
  bfin_mac, bnx2x, bnx2, cnic, tg3, and sfc. (BZ#974138)

• The realtime kernel was not built with the CONFIG_NET_DROP_WATCH kernel
  configuration option enabled. As such, attempting to run the dropwatch
  command resulted in the following error:

Unable to find NET_DM family, dropwatch can’t work
Cleaning up on socket creation error

With this update, the realtime kernel is built with the
CONFIG_NET_DROP_WATCH option, allowing dropwatch to work as expected.
(BZ#979417)

Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.6.11.5-rt37, and correct these issues. The
system must be rebooted for this update to take effect.