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Ubuntu 12.04 LTS: USN-2587-1 Critical Kernel Denial of Service Threat

ubuntu
Calendar Grey April 30, 2015
Dist Ubuntu Esm H88
Ubuntu Security Notice USN-3489-2 highlights critical kernel weaknesses that can be exploited for privilege escalation and system instability.
Several security issues were fixed in the kernel.

Summary

Several security issues were fixed in the kernel.

Software Description:

- linux-lts-trusty: Linux hardware enablement kernel from Trusty

Details:

A stack overflow was discovered in the the microcode loader for the intel

x86 platform. A local attacker could exploit this flaw to cause a denial of

service (kernel crash) or to potentially execute code with kernel

privileges. (CVE-2015-2666)

It was discovered that the Linux kernel's IPv6 networking stack has a flaw

that allows using route advertisement (RA) messages to set the 'hop_limit'

to values that are too low. An unprivileged attacker on a local network

could exploit this flaw to cause a denial of service (IPv6 messages

dropped). (CVE-2015-2922)

Topics%20covered

Topics Covered

security advisory denial of service critical local exploit kernel ubuntu

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.13.0-51-generic   3.13.0-51.84~precise1
  linux-image-3.13.0-51-generic-lpae  3.13.0-51.84~precise1

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-2587-1

CVE-2015-2666, CVE-2015-2922

Severity
critical
Lowest
Low
Medium
High
Critical

April 30, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical local exploit kernel ubuntu

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-51.84~precise1

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