Ubuntu 3836-2: Linux kernel (HWE) vulnerabilities

    Date04 Dec 2018
    CategoryUbuntu
    2745
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3836-2
    December 04, 2018
    
    linux-hwe, linux-gcp 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-hwe: Linux hardware enablement (HWE) kernel
    
    Details:
    
    USN-3836-1 fixed vulnerabilities in the Linux kernel for Ubuntu 18.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 18.04 LTS for Ubuntu
    16.04 LTS.
    
    Jann Horn discovered that the Linux kernel mishandles mapping UID or GID
    ranges inside nested user namespaces in some situations. A local attacker
    could use this to bypass access controls on resources outside the
    namespace. (CVE-2018-18955)
    
    Philipp Wendler discovered that the overlayfs implementation in the Linux
    kernel did not properly verify the directory contents permissions from
    within a unprivileged user namespace. A local attacker could use this to
    expose sensitive information (protected file names). (CVE-2018-6559)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.15.0-1025-gcp     4.15.0-1025.26~16.04.1
      linux-image-4.15.0-42-generic   4.15.0-42.45~16.04.1
      linux-image-4.15.0-42-generic-lpae  4.15.0-42.45~16.04.1
      linux-image-4.15.0-42-lowlatency  4.15.0-42.45~16.04.1
      linux-image-gcp                 4.15.0.1025.39
      linux-image-generic-hwe-16.04   4.15.0.42.63
      linux-image-generic-lpae-hwe-16.04  4.15.0.42.63
      linux-image-gke                 4.15.0.1025.39
      linux-image-lowlatency-hwe-16.04  4.15.0.42.63
      linux-image-oem                 4.15.0.42.63
    
    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://usn.ubuntu.com/usn/usn-3836-2
      https://usn.ubuntu.com/usn/usn-3836-1
      CVE-2018-18955, CVE-2018-6559
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1025.26~16.04.1
      https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-42.45~16.04.1
    
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