CWE
362
Advisory Published

USN-2851-1: Linux kernel vulnerabilities

First published: Sat Dec 19 2015(Updated: )

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 consistency 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 consistency 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-2015-8552) Jann Horn discovered a ptrace issue with user namespaces in the Linux kernel. The namespace owner could potentially exploit this flaw by ptracing a root owned process entering the user namespace to elevate its privileges and potentially gain access outside of the namespace. (http://bugs.launchpad.net/bugs/1527374, CVE-2015-8709)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.2.0-22-generic<4.2.0-22.27
4.2.0-22.27
=15.10
All of
ubuntu/linux-image-4.2.0-22-generic-lpae<4.2.0-22.27
4.2.0-22.27
=15.10
All of
ubuntu/linux-image-4.2.0-22-lowlatency<4.2.0-22.27
4.2.0-22.27
=15.10
All of
ubuntu/linux-image-4.2.0-22-powerpc-e500mc<4.2.0-22.27
4.2.0-22.27
=15.10
All of
ubuntu/linux-image-4.2.0-22-powerpc-smp<4.2.0-22.27
4.2.0-22.27
=15.10
All of
ubuntu/linux-image-4.2.0-22-powerpc64-emb<4.2.0-22.27
4.2.0-22.27
=15.10
All of
ubuntu/linux-image-4.2.0-22-powerpc64-smp<4.2.0-22.27
4.2.0-22.27
=15.10

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-2851-1?

    The severity of USN-2851-1 is high.

  • How can an attacker exploit CVE-2015-8550?

    An attacker can exploit CVE-2015-8550 by causing a denial of service or potentially executing arbitrary code on the host.

  • Which versions of Ubuntu are affected by USN-2851-1?

    Ubuntu 15.10 is affected by USN-2851-1.

  • How do I fix the Linux kernel vulnerabilities mentioned in USN-2851-1?

    To fix the vulnerabilities, update your Ubuntu system to version 4.2.0-22.27 of the Linux kernel.

  • Where can I find more information about USN-2851-1?

    More information about USN-2851-1 can be found at the following references: <a href='https://ubuntu.com/security/CVE-2015-8550'>CVE-2015-8550</a>, <a href='https://ubuntu.com/security/CVE-2015-8551'>CVE-2015-8551</a>, <a href='https://ubuntu.com/security/CVE-2015-8552'>CVE-2015-8552</a>.

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