Ubuntu 3443-2: Linux kernel (HWE) vulnerabilities

    Date10 Oct 2017
    CategoryUbuntu
    74
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3443-2
    October 10, 2017
    
    linux-hwe vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-hwe: Linux hardware enablement (HWE) kernel
    
    Details:
    
    USN-3443-1 fixed vulnerabilities in the Linux kernel for Ubuntu 17.04.
    This update provides the corresponding updates for the Linux Hardware
    Enablement (HWE) kernel from Ubuntu 17.04 for Ubuntu 16.04 LTS.
    
    It was discovered that on the PowerPC architecture, the kernel did not
    properly sanitize the signal stack when handling sigreturn(). A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2017-1000255)
    
    Andrey Konovalov discovered that a divide-by-zero error existed in the TCP
    stack implementation in the Linux kernel. A local attacker could use this
    to cause a denial of service (system crash). (CVE-2017-14106)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.10.0-37-generic   4.10.0-37.41~16.04.1
      linux-image-4.10.0-37-generic-lpae  4.10.0-37.41~16.04.1
      linux-image-4.10.0-37-lowlatency  4.10.0-37.41~16.04.1
      linux-image-generic-hwe-16.04   4.10.0.37.39
      linux-image-generic-lpae-hwe-16.04  4.10.0.37.39
      linux-image-lowlatency-hwe-16.04  4.10.0.37.39
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    ATTENTION: Due to an unavoidable ABI change the kernel updates have
    been given a new version number, which requires you to recompile and
    reinstall all third party kernel modules you might have installed.
    Unless you manually uninstalled the standard kernel metapackages
    (e.g. linux-generic, linux-generic-lts-RELEASE, linux-virtual,
    linux-powerpc), a standard system upgrade will automatically perform
    this as well.
    
    References:
      https://www.ubuntu.com/usn/usn-3443-2
      https://www.ubuntu.com/usn/usn-3443-1
      CVE-2017-1000255, CVE-2017-14106
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-hwe/4.10.0-37.41~16.04.1
    
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