Ubuntu 3777-1: Linux kernel vulnerabilities

    Date01 Oct 2018
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    Ubuntu Security Notice USN-3777-1
    October 01, 2018
    linux, linux-aws, linux-gcp, linux-kvm, linux-oem, linux-raspi2 vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 18.04 LTS
    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-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
    Jann Horn discovered that the vmacache subsystem did not properly handle
    sequence number overflows, leading to a use-after-free vulnerability. A
    local attacker could use this to cause a denial of service (system crash)
    or execute arbitrary code. (CVE-2018-17182)
    It was discovered that the paravirtualization implementation in the Linux
    kernel did not properly handle some indirect calls, reducing the
    effectiveness of Spectre v2 mitigations for paravirtual guests. A local
    attacker could use this to expose sensitive information. (CVE-2018-15594)
    It was discovered that microprocessors utilizing speculative execution and
    prediction of return addresses via Return Stack Buffer (RSB) may allow
    unauthorized memory reads via sidechannel attacks. An attacker could use
    this to expose sensitive information. (CVE-2018-15572)
    Andy Lutomirski and Mika Penttilä discovered that the KVM implementation
    in the Linux kernel did not properly check privilege levels when emulating
    some instructions. An unprivileged attacker in a guest VM could use this to
    escalate privileges within the guest. (CVE-2018-10853)
    It was discovered that a stack-based buffer overflow existed in the iSCSI
    target implementation of the Linux kernel. A remote attacker could use this
    to cause a denial of service (system crash). (CVE-2018-14633)
    It was discovered that a memory leak existed in the IRDA subsystem of the
    Linux kernel. A local attacker could use this to cause a denial of service
    (kernel memory exhaustion). (CVE-2018-6554)
    It was discovered that a use-after-free vulnerability existed in the IRDA
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2018-6555)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1021-gcp     4.15.0-1021.22
      linux-image-4.15.0-1021-oem     4.15.0-1021.24
      linux-image-4.15.0-1023-aws     4.15.0-1023.23
      linux-image-4.15.0-1023-kvm     4.15.0-1023.23
      linux-image-4.15.0-1024-raspi2  4.15.0-1024.26
      linux-image-4.15.0-36-generic   4.15.0-36.39
      linux-image-4.15.0-36-generic-lpae  4.15.0-36.39
      linux-image-4.15.0-36-lowlatency  4.15.0-36.39
      linux-image-4.15.0-36-snapdragon  4.15.0-36.39
    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.
      CVE-2018-10853, CVE-2018-14633, CVE-2018-15572, CVE-2018-15594,
      CVE-2018-17182, CVE-2018-6554, CVE-2018-6555
    Package Information:

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