[USN-2395-1] Linux kernel vulnerabilities

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==========================================================================
Ubuntu Security Notice USN-2395-1
October 30, 2014

linux vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 14.04 LTS

Summary:

Several security issues were fixed in the kernel.

Software Description:
- linux: Linux kernel

Details:

Nadav Amit reported that the KVM (Kernel Virtual Machine) mishandles
noncanonical addresses when emulating instructions that change the rip
(Instruction Pointer). A guest user with access to I/O or the MMIO can use
this flaw to cause a denial of service (system crash) of the guest.
(CVE-2014-3647)

A flaw was discovered with the handling of the invept instruction in the
KVM (Kernel Virtual Machine) subsystem of the Linux kernel. An unprivileged
guest user could exploit this flaw to cause a denial of service (system
crash) on the guest. (CVE-2014-3646)

Lars Bull reported a race condition in the PIT (programmable interrupt
timer) emulation in the KVM (Kernel Virtual Machine) subsystem of the Linux
kernel. A local guest user with access to PIT i/o ports could exploit this
flaw to cause a denial of service (crash) on the host. (CVE-2014-3611)

Lars Bull and Nadav Amit reported a flaw in how KVM (the Kernel Virtual
Machine) handles noncanonical writes to certain MSR registers. A privileged
guest user can exploit this flaw to cause a denial of service (kernel
panic) on the host. (CVE-2014-3610)

Raphael Geissert reported a NULL pointer dereference in the Linux kernel's
CIFS client. A remote CIFS server could cause a denial of service (system
crash) or possibly have other unspecified impact by deleting IPC$ share
during resolution of DFS referrals. (CVE-2014-7145)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 14.04 LTS:
linux-image-3.13.0-39-generic 3.13.0-39.66
linux-image-3.13.0-39-generic-lpae 3.13.0-39.66
linux-image-3.13.0-39-lowlatency 3.13.0-39.66
linux-image-3.13.0-39-powerpc-e500 3.13.0-39.66
linux-image-3.13.0-39-powerpc-e500mc 3.13.0-39.66
linux-image-3.13.0-39-powerpc-smp 3.13.0-39.66
linux-image-3.13.0-39-powerpc64-emb 3.13.0-39.66
linux-image-3.13.0-39-powerpc64-smp 3.13.0-39.66

After a standard system update you need to reboot your computer to make
all the necessary changes.

ATTENTION: Due to an unavoidable ABI change the kernel updates have
been given a new version number, which requires you to recompile and
reinstall all third party kernel modules you might have installed. If
you use linux-restricted-modules, you have to update that package as
well to get modules which work with the new kernel version. Unless you
manually uninstalled the standard kernel metapackages (e.g. linux-generic,
linux-server, linux-powerpc), a standard system upgrade will automatically
perform this as well.

References:
http://www.ubuntu.com/usn/usn-2395-1
CVE-2014-3610, CVE-2014-3611, CVE-2014-3646, CVE-2014-3647,
CVE-2014-7145

Package Information:
https://launchpad.net/ubuntu/+source/linux/3.13.0-39.66