kernel security update

CentOS Errata and Security Advisory CESA-2010:0839

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

This update fixes the following security issues:

• A NULL pointer dereference flaw was found in the io_submit_one() function
  in the Linux kernel asynchronous I/O implementation. A local, unprivileged
  user could use this flaw to cause a denial of service. (CVE-2010-3066,
  Moderate)

• A flaw was found in the xfs_ioc_fsgetxattr() function in the Linux kernel
  XFS file system implementation. A data structure in xfs_ioc_fsgetxattr()
  was not initialized properly before being copied to user-space. A local,
  unprivileged user could use this flaw to cause an information leak.
  (CVE-2010-3078, Moderate)

• The exception fixup code for the __futex_atomic_op1, __futex_atomic_op2,
  and futex_atomic_cmpxchg_inatomic() macros replaced the LOCK prefix with a
  NOP instruction. A local, unprivileged user could use this flaw to cause a
  denial of service. (CVE-2010-3086, Moderate)

• A flaw was found in the tcf_act_police_dump() function in the Linux
  kernel network traffic policing implementation. A data structure in
  tcf_act_police_dump() was not initialized properly before being copied to
  user-space. A local, unprivileged user could use this flaw to cause an
  information leak. (CVE-2010-3477, Moderate)

• A missing upper bound integer check was found in the sys_io_submit()
  function in the Linux kernel asynchronous I/O implementation. A local,
  unprivileged user could use this flaw to cause an information leak.
  (CVE-2010-3067, Low)

Red Hat would like to thank Tavis Ormandy for reporting CVE-2010-3066,
CVE-2010-3086, and CVE-2010-3067, and Dan Rosenberg for reporting
CVE-2010-3078.

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

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-November/079321.html
https://lists.centos.org/pipermail/centos-announce/2010-November/079322.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-2010:0839