CWE
362
Advisory Published

USN-2850-1: 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-3.19.0-42-generic<3.19.0-42.48
3.19.0-42.48
=15.04
All of
ubuntu/linux-image-3.19.0-42-generic-lpae<3.19.0-42.48
3.19.0-42.48
=15.04
All of
ubuntu/linux-image-3.19.0-42-lowlatency<3.19.0-42.48
3.19.0-42.48
=15.04
All of
ubuntu/linux-image-3.19.0-42-powerpc-e500mc<3.19.0-42.48
3.19.0-42.48
=15.04
All of
ubuntu/linux-image-3.19.0-42-powerpc-smp<3.19.0-42.48
3.19.0-42.48
=15.04
All of
ubuntu/linux-image-3.19.0-42-powerpc64-emb<3.19.0-42.48
3.19.0-42.48
=15.04
All of
ubuntu/linux-image-3.19.0-42-powerpc64-smp<3.19.0-42.48
3.19.0-42.48
=15.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-2850-1?

    The severity of USN-2850-1 is high.

  • How does the CVE-2015-8550 vulnerability in USN-2850-1 affect the system?

    The CVE-2015-8550 vulnerability in USN-2850-1 can cause a denial of service or potential code execution on the host system.

  • Which versions of Ubuntu are affected by USN-2850-1?

    Ubuntu version 15.04 is affected by USN-2850-1.

  • How can I fix CVE-2015-8550 vulnerability in USN-2850-1?

    To fix the CVE-2015-8550 vulnerability in USN-2850-1, update the system to Linux kernel version 3.19.0-42.48 or higher.

  • Where can I find more information about USN-2850-1?

    You can find more information about USN-2850-1 at the following URL: [https://ubuntu.com/security/CVE-2015-8550](https://ubuntu.com/security/CVE-2015-8550)

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