CWE
362
Advisory Published

USN-2853-1: Linux kernel (Wily HWE) vulnerabilities

First published: Sun Dec 20 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<4.2.0-22.27~14.04.1
4.2.0-22.27~14.04.1
=14.04
All of
ubuntu/linux-image-4.2.0-22-generic-lpae<4.2.0-22.27~14.04.1
4.2.0-22.27~14.04.1
=14.04
All of
ubuntu/linux-image-4.2.0-22-lowlatency<4.2.0-22.27~14.04.1
4.2.0-22.27~14.04.1
=14.04
All of
ubuntu/linux-image-4.2.0-22-powerpc-e500mc<4.2.0-22.27~14.04.1
4.2.0-22.27~14.04.1
=14.04
All of
ubuntu/linux-image-4.2.0-22-powerpc-smp<4.2.0-22.27~14.04.1
4.2.0-22.27~14.04.1
=14.04
All of
ubuntu/linux-image-4.2.0-22-powerpc64-emb<4.2.0-22.27~14.04.1
4.2.0-22.27~14.04.1
=14.04
All of
ubuntu/linux-image-4.2.0-22-powerpc64-smp<4.2.0-22.27~14.04.1
4.2.0-22.27~14.04.1
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this advisory?

    The vulnerability ID for this advisory is USN-2853-1.

  • What is the severity of USN-2853-1?

    The severity of USN-2853-1 is not specified in the information provided.

  • How can an attacker exploit the vulnerabilities in this advisory?

    An attacker can exploit the vulnerabilities in this advisory to cause a denial of service or potentially execute arbitrary code on the host.

  • What is the affected software for USN-2853-1?

    The affected software for USN-2853-1 is Ubuntu Linux with versions 14.04 and the specified kernel versions.

  • How can I fix the vulnerabilities in USN-2853-1?

    To fix the vulnerabilities in USN-2853-1, update the affected software to the specified remedy versions.

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