Ubuntu 4135-2: Linux kernel vulnerabilities

    Date18 Sep 2019
    CategoryUbuntu
    267
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4135-2
    September 18, 2019
    
    linux, linux-aws, linux-azure, linux-lts-trusty, linux-lts-xenial
    vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM
    
    Details:
    
    Peter Pi discovered a buffer overflow in the virtio network backend
    (vhost_net) implementation in the Linux kernel. An attacker in a guest may
    be able to use this to cause a denial of service (host OS crash) or
    possibly execute arbitrary code in the host OS. (CVE-2019-14835)
    
    It was discovered that the Linux kernel on PowerPC architectures did not
    properly handle Facility Unavailable exceptions in some situations. A local
    attacker could use this to expose sensitive information. (CVE-2019-15030)
    
    It was discovered that the Linux kernel on PowerPC architectures did not
    properly handle exceptions on interrupts in some situations. A local
    attacker could use this to expose sensitive information. (CVE-2019-15031)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      linux-image-3.13.0-173-generic  3.13.0-173.224
      linux-image-3.13.0-173-generic-lpae  3.13.0-173.224
      linux-image-3.13.0-173-lowlatency  3.13.0-173.224
      linux-image-3.13.0-173-powerpc-e500  3.13.0-173.224
      linux-image-3.13.0-173-powerpc-e500mc  3.13.0-173.224
      linux-image-3.13.0-173-powerpc-smp  3.13.0-173.224
      linux-image-3.13.0-173-powerpc64-emb  3.13.0-173.224
      linux-image-3.13.0-173-powerpc64-smp  3.13.0-173.224
      linux-image-4.15.0-1059-azure   4.15.0-1059.64~14.04.1
      linux-image-4.4.0-1054-aws      4.4.0-1054.58
      linux-image-4.4.0-164-generic   4.4.0-164.192~14.04.1
      linux-image-4.4.0-164-generic-lpae  4.4.0-164.192~14.04.1
      linux-image-4.4.0-164-lowlatency  4.4.0-164.192~14.04.1
      linux-image-4.4.0-164-powerpc-e500mc  4.4.0-164.192~14.04.1
      linux-image-4.4.0-164-powerpc-smp  4.4.0-164.192~14.04.1
      linux-image-4.4.0-164-powerpc64-emb  4.4.0-164.192~14.04.1
      linux-image-4.4.0-164-powerpc64-smp  4.4.0-164.192~14.04.1
      linux-image-aws                 4.4.0.1054.55
      linux-image-azure               4.15.0.1059.45
      linux-image-generic             3.13.0.173.184
      linux-image-generic-lpae        3.13.0.173.184
      linux-image-generic-lpae-lts-xenial  4.4.0.164.143
      linux-image-generic-lts-xenial  4.4.0.164.143
      linux-image-lowlatency          3.13.0.173.184
      linux-image-lowlatency-lts-xenial  4.4.0.164.143
      linux-image-powerpc-e500        3.13.0.173.184
      linux-image-powerpc-e500mc      3.13.0.173.184
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.164.143
      linux-image-powerpc-smp         3.13.0.173.184
      linux-image-powerpc-smp-lts-xenial  4.4.0.164.143
      linux-image-powerpc64-emb       3.13.0.173.184
      linux-image-powerpc64-emb-lts-xenial  4.4.0.164.143
      linux-image-powerpc64-smp       3.13.0.173.184
      linux-image-powerpc64-smp-lts-xenial  4.4.0.164.143
      linux-image-server              3.13.0.173.184
      linux-image-virtual             3.13.0.173.184
      linux-image-virtual-lts-xenial  4.4.0.164.143
    
    Ubuntu 12.04 ESM:
      linux-image-3.13.0-173-generic  3.13.0-173.224~12.04.1
      linux-image-3.13.0-173-generic-lpae  3.13.0-173.224~12.04.1
      linux-image-3.13.0-173-lowlatency  3.13.0-173.224~12.04.1
      linux-image-3.2.0-143-generic   3.2.0-143.190
      linux-image-3.2.0-143-generic-pae  3.2.0-143.190
      linux-image-3.2.0-143-highbank  3.2.0-143.190
      linux-image-3.2.0-143-omap      3.2.0-143.190
      linux-image-3.2.0-143-powerpc-smp  3.2.0-143.190
      linux-image-3.2.0-143-powerpc64-smp  3.2.0-143.190
      linux-image-3.2.0-143-virtual   3.2.0-143.190
      linux-image-generic             3.2.0.143.158
      linux-image-generic-lpae-lts-trusty  3.13.0.173.161
      linux-image-generic-lts-trusty  3.13.0.173.161
      linux-image-generic-pae         3.2.0.143.158
      linux-image-highbank            3.2.0.143.158
      linux-image-omap                3.2.0.143.158
      linux-image-powerpc             3.2.0.143.158
      linux-image-powerpc-smp         3.2.0.143.158
      linux-image-powerpc64-smp       3.2.0.143.158
      linux-image-server              3.2.0.143.158
      linux-image-virtual             3.2.0.143.158
    
    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/4135-2
      https://usn.ubuntu.com/4135-1
      CVE-2019-14835, CVE-2019-15030, CVE-2019-15031
    
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