Ubuntu 3631-1: Linux kernel vulnerabilities

    Date24 Apr 2018
    CategoryUbuntu
    6194
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3631-1
    April 24, 2018
    
    linux, linux-aws, linux-kvm, linux-raspi2, linux-snapdragon 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: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    - linux-snapdragon: Linux kernel for Snapdragon processors
    
    Details:
    
    It was discovered that a buffer overread vulnerability existed in the
    keyring subsystem of the Linux kernel. A local attacker could possibly use
    this to expose sensitive information (kernel memory). (CVE-2017-13305)
    
    It was discovered that the DM04/QQBOX USB driver in the Linux kernel did
    not properly handle device attachment and warm-start. A physically
    proximate attacker could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2017-16538)
    
    Luo Quan and Wei Yang discovered that a race condition existed in the
    Advanced Linux Sound Architecture (ALSA) subsystem of the Linux kernel when
    handling ioctl()s. A local attacker could use this to cause a denial of
    service (system deadlock). (CVE-2018-1000004)
    
    Wang Qize discovered that an information disclosure vulnerability existed
    in the SMBus driver for ACPI Embedded Controllers in the Linux kernel. A
    local attacker could use this to expose sensitive information (kernel
    pointer addresses). (CVE-2018-5750)
    
    ??? discovered that a race condition existed in the Advanced Linux
    Sound Architecture (ALSA) subsystem of the Linux kernel that could lead to
    a use-after-free or an out-of-bounds buffer access. A local attacker with
    access to /dev/snd/seq could use this to cause a denial of service (system
    crash) or possibly execute arbitrary code. (CVE-2018-7566)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1021-kvm      4.4.0-1021.26
      linux-image-4.4.0-1055-aws      4.4.0-1055.64
      linux-image-4.4.0-1087-raspi2   4.4.0-1087.95
      linux-image-4.4.0-1090-snapdragon  4.4.0-1090.95
      linux-image-4.4.0-121-generic   4.4.0-121.145
      linux-image-4.4.0-121-generic-lpae  4.4.0-121.145
      linux-image-4.4.0-121-lowlatency  4.4.0-121.145
      linux-image-4.4.0-121-powerpc-e500mc  4.4.0-121.145
      linux-image-4.4.0-121-powerpc-smp  4.4.0-121.145
      linux-image-4.4.0-121-powerpc64-emb  4.4.0-121.145
      linux-image-4.4.0-121-powerpc64-smp  4.4.0-121.145
      linux-image-aws                 4.4.0.1055.57
      linux-image-generic             4.4.0.121.127
      linux-image-generic-lpae        4.4.0.121.127
      linux-image-kvm                 4.4.0.1021.20
      linux-image-lowlatency          4.4.0.121.127
      linux-image-powerpc-e500mc      4.4.0.121.127
      linux-image-powerpc-smp         4.4.0.121.127
      linux-image-powerpc64-emb       4.4.0.121.127
      linux-image-powerpc64-smp       4.4.0.121.127
      linux-image-raspi2              4.4.0.1087.87
      linux-image-snapdragon          4.4.0.1090.82
    
    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-3631-1
      CVE-2017-13305, CVE-2017-16538, CVE-2018-1000004, CVE-2018-5750,
      CVE-2018-7566
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-121.145
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1055.64
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1021.26
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1087.95
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1090.95
    
    
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