kernel security update

CentOS Errata and Security Advisory CESA-2007:1049

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

A flaw was found in the handling of process death signals. This allowed a
local user to send arbitrary signals to the suid-process executed by that
user. A successful exploitation of this flaw depends on the structure of
the suid-program and its signal handling. (CVE-2007-3848, Important)

A flaw was found in the IPv4 forwarding base. This allowed a local user to
cause a denial of service. (CVE-2007-2172, Important)

A flaw was found where a corrupted executable file could cause cross-region
memory mappings on Itanium systems. This allowed a local user to cause a
denial of service. (CVE-2006-4538, Moderate)

A flaw was found in the stack expansion when using the hugetlb kernel on
PowerPC systems. This allowed a local user to cause a denial of service.
(CVE-2007-3739, Moderate)

A flaw was found in the aacraid SCSI driver. This allowed a local user to
make ioctl calls to the driver that should be restricted to privileged
users. (CVE-2007-4308, Moderate)

As well, these updated packages fix the following bug:

• a bug in the TCP header prediction code may have caused “TCP: Treason
  uncloaked!” messages to be logged. In certain situations this may have lead
  to TCP connections hanging or aborting.

Red Hat Enterprise Linux 3 users are advised to upgrade to these updated
packages, which contain backported patches to resolve these issues.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2007-December/076641.html
https://lists.centos.org/pipermail/centos-announce/2007-December/076642.html
https://lists.centos.org/pipermail/centos-announce/2007-December/076648.html
https://lists.centos.org/pipermail/centos-announce/2007-December/076649.html

Affected packages:
kernel
kernel-BOOT
kernel-doc
kernel-hugemem
kernel-hugemem-unsupported
kernel-smp
kernel-smp-unsupported
kernel-source
kernel-unsupported

Upstream details at:
https://access.redhat.com/errata/RHSA-2007:1049