Ubuntu 3698-2: Linux kernel (Trusty HWE) vulnerabilities

    Date02 Jul 2018
    CategoryUbuntu
    3272
    Posted ByAnthony Pell
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3698-2
    July 02, 2018
    
    linux-lts-trusty vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM
    
    Details:
    
    USN-3698-1 fixed vulnerabilities in the Linux kernel for Ubuntu 14.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 14.04 LTS for Ubuntu
    12.04 ESM.
    
    It was discovered that the nested KVM implementation in the Linux kernel in
    some situations did not properly prevent second level guests from reading
    and writing the hardware CR8 register. A local attacker in a guest could
    use this to cause a denial of service (system crash). (CVE-2017-12154)
    
    Fan Wu, Haoran Qiu, and Shixiong Zhao discovered that the associative array
    implementation in the Linux kernel sometimes did not properly handle adding
    a new entry. A local attacker could use this to cause a denial of service
    (system crash). (CVE-2017-12193)
    
    It was discovered that a race condition existed in the ALSA subsystem of
    the Linux kernel when creating and deleting a port via ioctl(). A local
    attacker could use this to cause a denial of service (system crash) or
    possibly execute arbitrary code. (CVE-2017-15265)
    
    It was discovered that a null pointer dereference vulnerability existed in
    the DCCP protocol implementation in the Linux kernel. A local attacker
    could use this to cause a denial of service (system crash). (CVE-2018-1130)
    
    Julian Stecklina and Thomas Prescher discovered that FPU register states
    (such as MMX, SSE, and AVX registers) which are lazily restored are
    potentially vulnerable to a side channel attack. A local attacker could use
    this to expose sensitive information. (CVE-2018-3665)
    
    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)
    
    It was discovered that the SCTP Protocol implementation in the Linux kernel
    did not properly validate userspace provided payload lengths in some
    situations. A local attacker could use this to cause a denial of service
    (system crash). (CVE-2018-5803)
    
    It was discovered that an integer overflow error existed in the futex
    implementation in the Linux kernel. A local attacker could use this to
    cause a denial of service (system crash). (CVE-2018-6927)
    
    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)
    
    It was discovered that a memory leak existed in the SAS driver subsystem of
    the Linux kernel. A local attacker could use this to cause a denial of
    service (memory exhaustion). (CVE-2018-7757)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      linux-image-3.13.0-153-generic  3.13.0-153.203~precise1
      linux-image-3.13.0-153-generic-lpae  3.13.0-153.203~precise1
      linux-image-generic-lpae-lts-trusty  3.13.0.153.143
      linux-image-generic-lts-trusty  3.13.0.153.143
    
    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-3698-2
      https://usn.ubuntu.com/usn/usn-3698-1
      CVE-2017-12154, CVE-2017-12193, CVE-2017-15265, CVE-2018-1130,
      CVE-2018-3665, CVE-2018-5750, CVE-2018-5803, CVE-2018-6927,
      CVE-2018-7755, CVE-2018-7757
    
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