Advisory Published

USN-2843-1: Linux kernel vulnerabilities

First published: Thu Dec 17 2015(Updated: )

Jan Beulich discovered that the KVM svm hypervisor implementation in the Linux kernel did not properly catch Debug exceptions on AMD processors. An attacker in a guest virtual machine could use this to cause a denial of service (system crash) in the host OS. (CVE-2015-8104) 郭永刚 discovered that the ppp implementation in the Linux kernel did not ensure that certain slot numbers are valid. A local attacker with the privilege to call ioctl() on /dev/ppp could cause a denial of service (system crash). (CVE-2015-7799) Dmitry Vyukov discovered that the Linux kernel's keyring handler attempted to garbage collect incompletely instantiated keys. A local unprivileged attacker could use this to cause a denial of service (system crash). (CVE-2015-7872) It was discovered that the virtual video osd test driver in the Linux kernel did not properly initialize data structures. A local attacker could use this to obtain sensitive information from the kernel. (CVE-2015-7884) It was discovered that the driver for Digi Neo and ClassicBoard devices did not properly initialize data structures. A local attacker could use this to obtain sensitive information from the kernel. (CVE-2015-7885)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.2.0-21-powerpc64-emb<4.2.0-21.25
4.2.0-21.25
=15.10
All of
ubuntu/linux-image-4.2.0-21-powerpc-smp<4.2.0-21.25
4.2.0-21.25
=15.10
All of
ubuntu/linux-image-4.2.0-21-lowlatency<4.2.0-21.25
4.2.0-21.25
=15.10
All of
ubuntu/linux-image-4.2.0-21-generic-lpae<4.2.0-21.25
4.2.0-21.25
=15.10
All of
ubuntu/linux-image-4.2.0-21-generic<4.2.0-21.25
4.2.0-21.25
=15.10
All of
ubuntu/linux-image-4.2.0-21-powerpc-e500mc<4.2.0-21.25
4.2.0-21.25
=15.10
All of
ubuntu/linux-image-4.2.0-21-powerpc64-smp<4.2.0-21.25
4.2.0-21.25
=15.10

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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 CVE-2015-8104.

  • What is the impact of CVE-2015-8104?

    CVE-2015-8104 can be used by an attacker in a guest virtual machine to cause a denial of service (system crash) in the host OS.

  • How can I fix the CVE-2015-8104 vulnerability?

    To fix the CVE-2015-8104 vulnerability, update your Linux kernel to version 4.2.0-21.25 or higher.

  • Is Ubuntu 15.10 affected by CVE-2015-8104?

    Yes, Ubuntu 15.10 is affected by CVE-2015-8104.

  • Where can I find more information about CVE-2015-8104?

    You can find more information about CVE-2015-8104 at the following link: [CVE-2015-8104](https://ubuntu.com/security/CVE-2015-8104).

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