kernel security update

CentOS Errata and Security Advisory CESA-2010:0398

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

This update fixes the following security issues:

• a flaw was found in the Unidirectional Lightweight Encapsulation (ULE)
  implementation. A remote attacker could send a specially-crafted ISO
  MPEG-2 Transport Stream (TS) frame to a target system, resulting in an
  infinite loop (denial of service). (CVE-2010-1086, Important)

• on AMD64 systems, it was discovered that the kernel did not ensure the
  ELF interpreter was available before making a call to the SET_PERSONALITY
  macro. A local attacker could use this flaw to cause a denial of service by
  running a 32-bit application that attempts to execute a 64-bit application.
  (CVE-2010-0307, Moderate)

• a flaw was found in the kernel connector implementation. A local,
  unprivileged user could trigger this flaw by sending an arbitrary number
  of notification requests using specially-crafted netlink messages,
  resulting in a denial of service. (CVE-2010-0410, Moderate)

• a flaw was found in the Memory-mapped I/O (MMIO) instruction decoder in
  the Xen hypervisor implementation. An unprivileged guest user could use
  this flaw to trick the hypervisor into emulating a certain instruction,
  which could crash the guest (denial of service). (CVE-2010-0730, Moderate)

• a divide-by-zero flaw was found in the azx_position_ok() function in the
  driver for Intel High Definition Audio, snd-hda-intel. A local,
  unprivileged user could trigger this flaw to cause a kernel crash (denial
  of service). (CVE-2010-1085, Moderate)

This update also fixes the following bugs:

• in some cases, booting a system with the “iommu=on” kernel parameter
  resulted in a Xen hypervisor panic. (BZ#580199)

• the fnic driver flushed the Rx queue instead of the Tx queue after
  fabric login. This caused crashes in some cases. (BZ#580829)

• “kernel unaligned access” warnings were logged to the dmesg log on some
  systems. (BZ#580832)

• the “Northbridge Error, node 1, core: -1 K8 ECC error” error occurred on
  some systems using the amd64_edac driver. (BZ#580836)

• in rare circumstances, when using kdump and booting a kernel with
  “crashkernel=128M@16M”, the kdump kernel did not boot after a crash.
  (BZ#580838)

• TLB page table entry flushing was done incorrectly on IBM System z,
  possibly causing crashes, subtle data inconsistency, or other issues.
  (BZ#580839)

• iSCSI failover times were slower than in Red Hat Enterprise Linux 5.3.
  (BZ#580840)

• fixed floating point state corruption after signal. (BZ#580841)

• in certain circumstances, under heavy load, certain network interface
  cards using the bnx2 driver and configured to use MSI-X, could stop
  processing interrupts and then network connectivity would cease.
  (BZ#587799)

• cnic parts resets could cause a deadlock when the bnx2 device was
  enslaved in a bonding device and that device had an associated VLAN.
  (BZ#581148)

• some BIOS implementations initialized interrupt remapping hardware in a
  way the Xen hypervisor implementation did not expect. This could have
  caused a system hang during boot. (BZ#581150)

• AMD Magny-Cours systems panicked when booting a 32-bit kernel.
  (BZ#580846)

Users should upgrade to these updated packages, which contain backported
patches to correct these issues. The system must be rebooted for this
update to take effect.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2010-May/078845.html
https://lists.centos.org/pipermail/centos-announce/2010-May/078846.html

Affected packages:
kernel
kernel-PAE
kernel-PAE-devel
kernel-debug
kernel-debug-devel
kernel-devel
kernel-doc
kernel-headers
kernel-xen
kernel-xen-devel

Upstream details at:
https://access.redhat.com/errata/RHSA-2010:0398