Ubuntu 3695-1: Linux kernel vulnerabilities

    Date02 Jul 2018
    CategoryUbuntu
    1132
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3695-1
    July 02, 2018
    
    linux, linux-aws, linux-azure, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    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-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-oem: Linux kernel for OEM processors
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    Wen Xu discovered that the ext4 file system implementation in the Linux
    kernel did not properly initialize the crc32c checksum driver. A local
    attacker could use this to cause a denial of service (system crash).
    (CVE-2018-1094)
    
    It was discovered that the cdrom driver in the Linux kernel contained an
    incorrect bounds check. A local attacker could use this to expose sensitive
    information (kernel memory). (CVE-2018-10940)
    
    Wen Xu discovered that the ext4 file system implementation in the Linux
    kernel did not properly validate xattr sizes. A local attacker could use
    this to cause a denial of service (system crash). (CVE-2018-1095)
    
    Jann Horn discovered that the 32 bit adjtimex() syscall implementation for
    64 bit Linux kernels did not properly initialize memory returned to user
    space in some situations. A local attacker could use this to expose
    sensitive information (kernel memory). (CVE-2018-11508)
    
    It was discovered that an information leak vulnerability existed in the
    floppy driver in the Linux kernel. A local attacker could use this to
    expose sensitive information (kernel memory). (CVE-2018-7755)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1010-gcp     4.15.0-1010.10
      linux-image-4.15.0-1011-aws     4.15.0-1011.11
      linux-image-4.15.0-1012-kvm     4.15.0-1012.12
      linux-image-4.15.0-1013-raspi2  4.15.0-1013.14
      linux-image-4.15.0-1014-azure   4.15.0-1014.14
      linux-image-4.15.0-24-generic   4.15.0-24.26
      linux-image-4.15.0-24-generic-lpae  4.15.0-24.26
      linux-image-4.15.0-24-lowlatency  4.15.0-24.26
      linux-image-4.15.0-24-snapdragon  4.15.0-24.26
      linux-image-aws                 4.15.0.1011.11
      linux-image-azure               4.15.0.1014.14
      linux-image-gcp                 4.15.0.1010.12
      linux-image-generic             4.15.0.24.26
      linux-image-generic-lpae        4.15.0.24.26
      linux-image-gke                 4.15.0.1010.12
      linux-image-kvm                 4.15.0.1012.12
      linux-image-lowlatency          4.15.0.24.26
      linux-image-oem                 4.15.0.1009.11
      linux-image-raspi2              4.15.0.1013.11
      linux-image-snapdragon          4.15.0.24.26
    
    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-3695-1
      CVE-2018-1094, CVE-2018-10940, CVE-2018-1095, CVE-2018-11508,
      CVE-2018-7755
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.15.0-24.26
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1011.11
      https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1014.14
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1010.10
      https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1012.12
      https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1009.12
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1013.14
    
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