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Ubuntu 12.04 LTS: USN-2443-1 Moderate: Kernel Security Issues

ubuntu
Calendar Grey December 12, 2014
Dist Ubuntu Esm H88
Multiple vulnerabilities in the Linux kernel patched via a recent release, mitigating significant security risks and enhancing system integrity.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux: Linux kernel

Details:

An information leak in the Linux kernel was discovered that could leak the

high 16 bits of the kernel stack address on 32-bit Kernel Virtual Machine

(KVM) paravirt guests. A user in the guest OS could exploit this leak to

obtain information that could potentially be used to aid in attacking the

kernel. (CVE-2014-8134)

Rabin Vincent, Robert Swiecki, Russell King discovered that the ftrace

subsystem of the Linux kernel does not properly handle private syscall

numbers. A local user could exploit this flaw to cause a denial of service

(OOPS). (CVE-2014-7826)

Rabin Vincent, Robert Swiecki, Russell Kinglaw discovered a flaw in how the

perf subsystem of the Linux kernel handles private systecall numbers. A

local user could exploit this to cause a denial of service (OOPS) or bypass

ASLR protections via a crafted application. (CVE-2014-7825)

A null pointer der...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory moderate denial of service information leak kernel ubuntu linux updates

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.2.0-74-generic    3.2.0-74.109
  linux-image-3.2.0-74-generic-pae  3.2.0-74.109
  linux-image-3.2.0-74-highbank   3.2.0-74.109
  linux-image-3.2.0-74-omap       3.2.0-74.109
  linux-image-3.2.0-74-powerpc-smp  3.2.0-74.109
  linux-image-3.2.0-74-powerpc64-smp  3.2.0-74.109
  linux-image-3.2.0-74-virtual    3.2.0-74.109

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-2443-1

CVE-2014-7825, CVE-2014-7826, CVE-2014-7841, CVE-2014-8134,

CVE-2014-8884, CVE-2014-9090

December 12, 2014

Topics%20covered

Topics Covered

security advisory moderate denial of service information leak kernel ubuntu linux updates

Package Information

https://launchpad.net/ubuntu/+source/linux/3.2.0-74.109

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