Advisory Published

USN-2797-1: Linux kernel (Utopic HWE) vulnerabilities

First published: Thu Nov 05 2015(Updated: )

It was discovered that the Linux kernel did not check if a new IPv6 MTU set by a user space application was valid. A remote attacker could forge a route advertisement with an invalid MTU that a user space daemon like NetworkManager would honor and apply to the kernel, causing a denial of service. (CVE-2015-0272) It was discovered that in certain situations, a directory could be renamed outside of a bind mounted location. An attacker could use this to escape bind mount containment and gain access to sensitive information. (CVE-2015-2925) Moein Ghasemzadeh discovered that the USB WhiteHEAT serial driver contained hardcoded attributes about the USB devices. An attacker could construct a fake WhiteHEAT USB device that, when inserted, causes a denial of service (system crash). (CVE-2015-5257) It was discovered that the SCTP protocol implementation in the Linux kernel performed an incorrect sequence of protocol-initialization steps. A local attacker could use this to cause a denial of service (system crash). (CVE-2015-5283)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-3.16.0-52-generic<3.16.0-52.71~14.04.1
3.16.0-52.71~14.04.1
=14.04
All of
ubuntu/linux-image-3.16.0-52-generic-lpae<3.16.0-52.71~14.04.1
3.16.0-52.71~14.04.1
=14.04
All of
ubuntu/linux-image-3.16.0-52-lowlatency<3.16.0-52.71~14.04.1
3.16.0-52.71~14.04.1
=14.04
All of
ubuntu/linux-image-3.16.0-52-powerpc-e500mc<3.16.0-52.71~14.04.1
3.16.0-52.71~14.04.1
=14.04
All of
ubuntu/linux-image-3.16.0-52-powerpc-smp<3.16.0-52.71~14.04.1
3.16.0-52.71~14.04.1
=14.04
All of
ubuntu/linux-image-3.16.0-52-powerpc64-emb<3.16.0-52.71~14.04.1
3.16.0-52.71~14.04.1
=14.04
All of
ubuntu/linux-image-3.16.0-52-powerpc64-smp<3.16.0-52.71~14.04.1
3.16.0-52.71~14.04.1
=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability in USN-2797-1?

    The vulnerability is caused by the Linux kernel not checking if a new IPv6 MTU set by a user space application is valid, allowing a remote attacker to cause a denial of service.

  • How can the vulnerability in USN-2797-1 be exploited?

    Remote attackers can exploit this vulnerability by forging a route advertisement with an invalid MTU that a user space daemon like NetworkManager would honor and apply to the kernel.

  • What is the impact of the vulnerability in USN-2797-1?

    The vulnerability can cause a denial of service.

  • Which versions of Linux kernel are affected by the vulnerability in USN-2797-1?

    Linux kernel versions up to and including 3.16.0-52.71~14.04.1 are affected by this vulnerability.

  • How can I fix the vulnerability in USN-2797-1?

    To fix the vulnerability, update the Linux kernel to version 3.16.0-52.71~14.04.1 or later.

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