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Ubuntu 14.10: 2396-1 Critical Kernel Denial of Service Issues

ubuntu
Calendar Grey October 31, 2014
Scroller Ubuntu Esm H88
Address vulnerabilities within the Ubuntu Linux kernel resulting from various recognized security weaknesses affecting overall system reliability.
Several security issues were fixed in the kernel.

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...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service kernel update ubuntu system crash

Update Instructions

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

Ubuntu 14.10:
  linux-image-3.16.0-24-generic   3.16.0-24.32
  linux-image-3.16.0-24-generic-lpae  3.16.0-24.32
  linux-image-3.16.0-24-lowlatency  3.16.0-24.32
  linux-image-3.16.0-24-powerpc-e500mc  3.16.0-24.32
  linux-image-3.16.0-24-powerpc-smp  3.16.0-24.32
  linux-image-3.16.0-24-powerpc64-emb  3.16.0-24.32
  linux-image-3.16.0-24-powerpc64-smp  3.16.0-24.32

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

https://ubuntu.com/security/notices/USN-2396-1

CVE-2014-3610, CVE-2014-3611, CVE-2014-3646, CVE-2014-3647

Severity
critical
Lowest
Low
Medium
High
Critical

=========================================================================Ubuntu Security Notice USN-2396-1

Topics%20covered

Topics Covered

security advisory denial of service kernel update ubuntu system crash

Package Information

https://launchpad.net/ubuntu/+source/linux/3.16.0-24.32

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