Synopsis:    Important: kernel security, bug fix, and enhancement update
Issue Date:  2011-11-29
CVE Numbers: CVE-2011-2203
             CVE-2011-1898
             CVE-2011-2494
             CVE-2011-1162
             CVE-2011-3363
             CVE-2011-4110


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

This update fixes the following security issues:

* Using PCI passthrough without interrupt remapping support allowed Xen
hypervisor guests to generate MSI interrupts and thus potentially inject
traps. A privileged guest user could use this flaw to crash the host or
possibly escalate their privileges on the host. The fix for this issue can
prevent PCI passthrough working and guests starting.(CVE-2011-1898, Important)

* A flaw was found in the way CIFS (Common Internet File System) shares
with DFS referrals at their root were handled. An attacker on the local
network who is able to deploy a malicious CIFS server could create a CIFS
network share that, when mounted, would cause the client system to crash.
(CVE-2011-3363, Moderate)

* A NULL pointer dereference flaw was found in the way the Linux kernel's
key management facility handled user-defined key types. A local,
unprivileged user could use the keyctl utility to cause a denial of
service. (CVE-2011-4110, Moderate)

* A flaw in the way memory containing security-related data was handled in
tpm_read() could allow a local, unprivileged user to read the results of a
previously run TPM command. (CVE-2011-1162, Low)

* A NULL pointer dereference flaw was found in the Linux kernel's HFS file
system implementation. A local attacker could use this flaw to cause a
denial of service by mounting a disk that contains a specially-crafted HFS
file system with a corrupted MDB extent record. (CVE-2011-2203, Low)

* The I/O statistics from the taskstats subsystem could be read without
any restrictions. A local, unprivileged user could use this flaw to gather
confidential information, such as the length of a password used in a
process. (CVE-2011-2494, Low)


This update also fixes several bugs and adds one enhancement.

The system must be rebooted for this update to take effect.

SL5:
  i386
     kernel-2.6.18-274.12.1.el5.i686.rpm
     kernel-debug-2.6.18-274.12.1.el5.i686.rpm
     kernel-debug-debuginfo-2.6.18-274.12.1.el5.i686.rpm
     kernel-debug-devel-2.6.18-274.12.1.el5.i686.rpm
     kernel-debuginfo-2.6.18-274.12.1.el5.i686.rpm
     kernel-debuginfo-common-2.6.18-274.12.1.el5.i686.rpm
     kernel-devel-2.6.18-274.12.1.el5.i686.rpm
     kernel-headers-2.6.18-274.12.1.el5.i386.rpm
     kernel-PAE-2.6.18-274.12.1.el5.i686.rpm
     kernel-PAE-debuginfo-2.6.18-274.12.1.el5.i686.rpm
     kernel-PAE-devel-2.6.18-274.12.1.el5.i686.rpm
     kernel-xen-2.6.18-274.12.1.el5.i686.rpm
     kernel-xen-debuginfo-2.6.18-274.12.1.el5.i686.rpm
     kernel-xen-devel-2.6.18-274.12.1.el5.i686.rpm
  noarch
     kernel-doc-2.6.18-274.12.1.el5.noarch.rpm
  x86_64
     kernel-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-debug-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-debug-debuginfo-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-debug-devel-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-debuginfo-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-debuginfo-common-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-devel-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-headers-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-xen-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-xen-debuginfo-2.6.18-274.12.1.el5.x86_64.rpm
     kernel-xen-devel-2.6.18-274.12.1.el5.x86_64.rpm

- Scientific Linux Development Team