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Ubuntu 12.04 LTS USN-2840-1 Moderate: Denial Of Service In Kernel

ubuntu
Calendar Grey December 17, 2015
Scroller Ubuntu
Tackling essential kernel challenges in Ubuntu 12.04 LTS while implementing crucial patches for enhanced system safety and reliability.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted

to garbage collect incompletely instantiated keys. A local unprivileged

attacker could use this to cause a denial of service (system crash).

(CVE-2015-7872)

Jan Beulich discovered that the KVM svm hypervisor implementation in the

Linux kernel did not properly catch Debug exceptions on AMD processors. An

attacker in a guest virtual machine could use this to cause a denial of

service (system crash) in the host OS. (CVE-2015-8104)

Topics%20covered

Topics Covered

security advisory denial of service ubuntu system crash kernel issues

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-96-generic    3.2.0-96.136
  linux-image-3.2.0-96-generic-pae  3.2.0-96.136
  linux-image-3.2.0-96-highbank   3.2.0-96.136
  linux-image-3.2.0-96-omap       3.2.0-96.136
  linux-image-3.2.0-96-powerpc-smp  3.2.0-96.136
  linux-image-3.2.0-96-powerpc64-smp  3.2.0-96.136
  linux-image-3.2.0-96-virtual    3.2.0-96.136

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-2840-1

CVE-2015-7872, CVE-2015-8104

December 17, 2015

Topics%20covered

Topics Covered

security advisory denial of service ubuntu system crash kernel issues

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-96.136

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