kernel security update

CentOS Errata and Security Advisory CESA-2007:0014

The Linux kernel handles the basic functions of the operating system.

These new kernel packages contain fixes for the security issues described
below:

• a flaw in the get_fdb_entries function of the network bridging support
  that allowed a local user to cause a denial of service (crash) or allow a
  potential privilege escalation (CVE-2006-5751, Important)

• an information leak in the _block_prepare_write function that allowed a
  local user to read kernel memory (CVE-2006-4813, Important)

• an information leak in the copy_from_user() implementation on s390 and
  s390x platforms that allowed a local user to read kernel memory
  (CVE-2006-5174, Important)

• a flaw in the handling of /proc/net/ip6_flowlabel that allowed a local
  user to cause a denial of service (infinite loop) (CVE-2006-5619, Important)

• a flaw in the AIO handling that allowed a local user to cause a denial of
  service (panic) (CVE-2006-5754, Important)

• a race condition in the mincore system core that allowed a local user to
  cause a denial of service (system hang) (CVE-2006-4814, Moderate)

• a flaw in the ELF handling on ia64 and sparc architectures which
  triggered a cross-region memory mapping and allowed a local user to cause a
  denial of service (CVE-2006-4538, Moderate)

• a flaw in the dev_queue_xmit function of the network subsystem that
  allowed a local user to cause a denial of service (data corruption)
  (CVE-2006-6535, Moderate)

• a flaw in the handling of CAPI messages over Bluetooth that allowed a
  remote system to cause a denial of service or potential code execution.
  This flaw is only exploitable if a privileged user establishes a connection
  to a malicious remote device (CVE-2006-6106, Moderate)

• a flaw in the listxattr system call that allowed a local user to cause a
  denial of service (data corruption) or potential privilege escalation. To
  successfully exploit this flaw the existence of a bad inode is required
  first (CVE-2006-5753, Moderate)

• a flaw in the __find_get_block_slow function that allowed a local
  privileged user to cause a denial of service (CVE-2006-5757, Low)

• various flaws in the supported filesystems that allowed a local
  privileged user to cause a denial of service (CVE-2006-5823, CVE-2006-6053,
  CVE-2006-6054, CVE-2006-6056, Low)

In addition to the security issues described above, fixes for the following
bugs were included:

• initialization error of the tg3 driver with some BCM5703x network card

• a memory leak in the audit subsystem

• x86_64 nmi watchdog timeout is too short

• ext2/3 directory reads fail intermittently

Red Hat would like to thank Dmitriy Monakhov and Kostantin Khorenko for
reporting issues fixed in this erratum.

All Red Hat Enterprise Linux 4 users are advised to upgrade their kernels
to the packages associated with their machine architecture and
configurations as listed in this erratum.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2007-February/075659.html
https://lists.centos.org/pipermail/centos-announce/2007-January/075647.html
https://lists.centos.org/pipermail/centos-announce/2007-January/075648.html
https://lists.centos.org/pipermail/centos-announce/2007-January/075656.html

Affected packages:
kernel
kernel-devel
kernel-doc
kernel-hugemem
kernel-hugemem-devel
kernel-largesmp
kernel-largesmp-devel
kernel-smp
kernel-smp-devel

Upstream details at:
https://access.redhat.com/errata/RHSA-2007:0014
https://access.redhat.com/errata/RHSA-2007:0018