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Ubuntu 12.04 LTS: 2847-1 Critical: Kernel Security Issues Resolved

ubuntu
Calendar Grey December 20, 2015
Scroller Ubuntu
Numerous vulnerabilities addressed in the Ubuntu Linux kernel; essential to perform an update for enhanced performance and protection.
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:

Felix Wilhelm discovered a race condition in the Xen paravirtualized

drivers which can cause double fetch vulnerabilities. An attacker in the

paravirtualized guest could exploit this flaw to cause a denial of service

(crash the host) or potentially execute arbitrary code on the host.

(CVE-2015-8550)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not

perform sanity checks on the device's state. An attacker could exploit this

flaw to cause a denial of service (NULL dereference) on the host.

(CVE-2015-8551)

Konrad Rzeszutek Wilk discovered the Xen PCI backend driver does not

perform sanity checks on the device's state. An attacker could exploit this

flaw to cause a denial of service by flooding the logging system with

WARN() messages causing the initial domain to exhaust disk space.

(CVE-2015-855...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical kernel fixes linux-lts-trusty

Update Instructions

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

Ubuntu 12.04 LTS:
  linux-image-3.13.0-74-generic   3.13.0-74.118~precise1
  linux-image-3.13.0-74-generic-lpae  3.13.0-74.118~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.
Unless you manually uninstalled the standard kernel metapackages
(e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
linux-powerpc), a standard system upgrade will automatically perform
this as well.

References

https://ubuntu.com/security/notices/USN-2847-1

CVE-2015-8550, CVE-2015-8551, CVE-2015-8552, https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527374

Severity
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December 19, 2015

Topics%20covered

Topics Covered

security advisory denial of service critical kernel fixes linux-lts-trusty

Package Information

https://launchpad.net/ubuntu/+source/linux-lts-trusty/3.13.0-74.118~precise1

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