Synopsis:          Important: kernel security update
Advisory ID:       SLSA-2016:0450-1
Issue Date:        2016-03-15
CVE Numbers:       CVE-2013-2596
                   CVE-2015-2151
--

* An integer overflow flaw was found in the way the Linux kernel's Frame
Buffer device implementation mapped kernel memory to user space via the
mmap syscall. A local user able to access a frame buffer device file
(/dev/fb*) could possibly use this flaw to escalate their privileges on
the system. (CVE-2013-2596, Important)

* It was found that the Xen hypervisor x86 CPU emulator implementation did
not correctly handle certain instructions with segment overrides,
potentially resulting in a memory corruption. A malicious guest user could
use this flaw to read arbitrary data relating to other guests, cause a
denial of service on the host, or potentially escalate their privileges on
the host. (CVE-2015-2151, Important)

This update also fixes the following bugs:

* Previously, the CPU power of a CPU group could be zero. As a
consequence, a kernel panic occurred at "find_busiest_group+570" with
do_divide_error. The provided patch ensures that the division is only
performed if the CPU power is not zero, and the aforementioned panic no
longer occurs.

* Prior to this update, a bug occurred when performing an online resize of
an ext4 file system which had been previously converted from ext3. As a
consequence, the kernel crashed. The provided patch fixes online resizing
for such file systems by limiting the blockgroup search loop for non-
extent files, and the mentioned kernel crash no longer occurs.

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

SL5
  x86_64
    kernel-2.6.18-409.el5.x86_64.rpm
    kernel-debug-2.6.18-409.el5.x86_64.rpm
    kernel-debug-debuginfo-2.6.18-409.el5.x86_64.rpm
    kernel-debug-devel-2.6.18-409.el5.x86_64.rpm
    kernel-debuginfo-2.6.18-409.el5.x86_64.rpm
    kernel-debuginfo-common-2.6.18-409.el5.x86_64.rpm
    kernel-devel-2.6.18-409.el5.x86_64.rpm
    kernel-headers-2.6.18-409.el5.x86_64.rpm
    kernel-xen-2.6.18-409.el5.x86_64.rpm
    kernel-xen-debuginfo-2.6.18-409.el5.x86_64.rpm
    kernel-xen-devel-2.6.18-409.el5.x86_64.rpm
  i386
    kernel-2.6.18-409.el5.i686.rpm
    kernel-PAE-2.6.18-409.el5.i686.rpm
    kernel-PAE-debuginfo-2.6.18-409.el5.i686.rpm
    kernel-PAE-devel-2.6.18-409.el5.i686.rpm
    kernel-debug-2.6.18-409.el5.i686.rpm
    kernel-debug-debuginfo-2.6.18-409.el5.i686.rpm
    kernel-debug-devel-2.6.18-409.el5.i686.rpm
    kernel-debuginfo-2.6.18-409.el5.i686.rpm
    kernel-debuginfo-common-2.6.18-409.el5.i686.rpm
    kernel-devel-2.6.18-409.el5.i686.rpm
    kernel-headers-2.6.18-409.el5.i386.rpm
    kernel-xen-2.6.18-409.el5.i686.rpm
    kernel-xen-debuginfo-2.6.18-409.el5.i686.rpm
    kernel-xen-devel-2.6.18-409.el5.i686.rpm
  noarch
    kernel-doc-2.6.18-409.el5.noarch.rpm

- Scientific Linux Development Team