Scientific Linux 6: 2012-03-06 Moderate Kernel Security Update

Date: Thu, 8 Mar 2012 09:21:42 -0600
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Sender: Security Errata for Scientific Linux
 
From: Patrick Riehecky 
Subject: Security ERRATA Moderate: kernel on SL6.x i386/x86_64
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Synopsis: Moderate: kernel security and bug fix update
Issue Date: 2012-03-06
CVE Numbers: CVE-2011-4077
 CVE-2011-4081
 CVE-2011-4132
 CVE-2011-4347
 CVE-2011-4594
 CVE-2011-4611
 CVE-2011-4622
 CVE-2012-0207
 CVE-2012-0038
 CVE-2012-0045

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

This update fixes the following security issues:

* A buffer overflow flaw was found in the way the Linux kernel's XFS file
system implementation handled links with overly long path names. A local,
unprivileged user could use this flaw to cause a denial of service or
escalate their privileges by mounting a specially-crafted disk.
(CVE-2011-4077, Moderate)

* Flaws in ghash_update() and ghash_final() could allow a local,
unprivileged user to cause a denial of service. (CVE-2011-4081, Moderate)

* A flaw was found in the Linux kernel's Journaling Block Device (JBD). A
local, unprivileged user could use this flaw to crash the system by
mounting a specially-crafted ext3 or ext4 disk. (CVE-2011-4132, Moderate)

* It was found that the kvm_vm_ioctl_assign_device() function in the KVM
(Kernel-based Virtual Machine) subsystem of a Linux kernel did not check if
the user requesting device assignment was privileged or not. A local,
unprivileged user on the host could assign unused PCI devices, or even
devices that were in use and whose resources were not properly claimed by
the respective drivers, which could result in the host crashing.
(CVE-2011-4347, Moderate)

* Two flaws were found in the way the Linux kernel's __sys_sendmsg()
function, when invoked via the sendmmsg() system call, accessed user-space
memory. A local, unprivileged user could use these flaws to cause a denial
of service. (CVE-2011-4594, Moderate)

* A flaw was found in the way the KVM subsystem of a Linux kernel handled
PIT (Programmable Interval Timer) IRQs (interrupt requests) when there was
no virtual interrupt controller set up. A local, unprivileged user on the
host could force this situation to occur, resulting in the host crashing.
(CVE-2011-4622, Moderate)

* A flaw was found in the way the Linux kernel's XFS file system
implementation handled on-disk Access Control Lists (ACLs). A local,
unprivileged user could use this flaw to cause a denial of service or
escalate their privileges by mounting a specially-crafted disk.
(CVE-2012-0038, Moderate)

* A flaw was found in the way the Linux kernel's KVM hypervisor
implementation emulated the syscall instruction for 32-bit guests. An
unprivileged guest user could trigger this flaw to crash the guest.
(CVE-2012-0045, Moderate)

* A divide-by-zero flaw was found in the Linux kernel's igmp_heard_query()
function. An attacker able to send certain IGMP (Internet Group Management
Protocol) packets to a target system could use this flaw to cause a denial
of service. (CVE-2012-0207, Moderate)

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.

SL6:
 i386
 kernel-2.6.32-220.7.1.el6.i686.rpm
 kernel-debug-2.6.32-220.7.1.el6.i686.rpm
 kernel-debug-debuginfo-2.6.32-220.7.1.el6.i686.rpm
 kernel-debug-devel-2.6.32-220.7.1.el6.i686.rpm
 kernel-debuginfo-2.6.32-220.7.1.el6.i686.rpm
 kernel-debuginfo-common-i686-2.6.32-220.7.1.el6.i686.rpm
 kernel-devel-2.6.32-220.7.1.el6.i686.rpm
 kernel-headers-2.6.32-220.7.1.el6.i686.rpm
 perf-2.6.32-220.7.1.el6.i686.rpm
 perf-debuginfo-2.6.32-220.7.1.el6.i686.rpm
 python-perf-2.6.32-220.7.1.el6.i686.rpm
 noarch
 kernel-doc-2.6.32-220.7.1.el6.noarch.rpm
 kernel-firmware-2.6.32-220.7.1.el6.noarch.rpm
 x86_64
 kernel-2.6.32-220.7.1.el6.x86_64.rpm
 kernel-debug-2.6.32-220.7.1.el6.x86_64.rpm
 kernel-debug-debuginfo-2.6.32-220.7.1.el6.x86_64.rpm
 kernel-debug-devel-2.6.32-220.7.1.el6.x86_64.rpm
 kernel-debuginfo-2.6.32-220.7.1.el6.x86_64.rpm
 kernel-debuginfo-common-x86_64-2.6.32-220.7.1.el6.x86_64.rpm
 kernel-devel-2.6.32-220.7.1.el6.x86_64.rpm
 kernel-headers-2.6.32-220.7.1.el6.x86_64.rpm
 perf-2.6.32-220.7.1.el6.x86_64.rpm
 perf-debuginfo-2.6.32-220.7.1.el6.x86_64.rpm
 python-perf-2.6.32-220.7.1.el6.x86_64.rpm

- Scientific Linux Development Team