Advisory Published

USN-3541-2: Linux kernel (HWE) vulnerabilities

First published: Tue Jan 23 2018(Updated: )

USN-3541-1 addressed vulnerabilities in the Linux kernel for Ubuntu 17.10. This update provides the corresponding updates for the Linux Hardware Enablement (HWE) kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS. Jann Horn discovered that microprocessors utilizing speculative execution and branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Spectre. A local attacker could use this to expose sensitive information, including kernel memory. This update provides mitigations for the i386 (CVE-2017-5753 only), amd64, ppc64el, and s390x architectures. (CVE-2017-5715, CVE-2017-5753) USN-3523-2 mitigated CVE-2017-5754 (Meltdown) for the amd64 architecture in the Linux Hardware Enablement (HWE) kernel from Ubuntu 17.10 for Ubuntu 16.04 LTS. This update provides the corresponding mitigations for the ppc64el architecture. Original advisory details: Jann Horn discovered that microprocessors utilizing speculative execution and indirect branch prediction may allow unauthorized memory reads via sidechannel attacks. This flaw is known as Meltdown. A local attacker could use this to expose sensitive information, including kernel memory. (CVE-2017-5754)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/linux-image-4.13.0-1006-azure<4.13.0-1006.8
4.13.0-1006.8
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.13.0-1007-gcp<4.13.0-1007.10
4.13.0-1007.10
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.13.0-1017-oem<4.13.0-1017.18
4.13.0-1017.18
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.13.0-31-generic<4.13.0-31.34~16.04.1
4.13.0-31.34~16.04.1
Ubuntu OpenSSH Client=16.04
All of
ubuntu/linux-image-4.13.0-31-lowlatency<4.13.0-31.34~16.04.1
4.13.0-31.34~16.04.1
Ubuntu OpenSSH Client=16.04

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Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the vulnerability ID for this security update?

    The vulnerability ID for this security update is USN-3541-2.

  • What is the affected software for this vulnerability?

    The affected software for this vulnerability is the Linux kernel for Ubuntu 16.04 LTS.

  • What is the severity of this vulnerability?

    The severity of this vulnerability is not specified.

  • How do I fix this vulnerability?

    To fix this vulnerability, update the Linux kernel to version 4.13.0-1006.8 or later.

  • Where can I find more information about this vulnerability?

    You can find more information about this vulnerability on the Ubuntu security website. Visit the following links: CVE-2017-5715, CVE-2017-5753, CVE-2017-5754.

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