Ubuntu 3007-1: Linux kernel (Raspberry Pi 2) vulnerabilities

    Date10 Jun 2016
    CategoryUbuntu
    33
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the kernel.
    ==========================================================================
    Ubuntu Security Notice USN-3007-1
    June 10, 2016
    
    linux-raspi2 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the kernel.
    
    Software Description:
    - linux-raspi2: Linux kernel for Raspberry Pi 2
    
    Details:
    
    Justin Yackoski discovered that the Atheros L2 Ethernet Driver in the Linux
    kernel incorrectly enables scatter/gather I/O. A remote attacker could use
    this to obtain potentially sensitive information from kernel memory.
    (CVE-2016-2117)
    
    Jann Horn discovered that eCryptfs improperly attempted to use the mmap()
    handler of a lower filesystem that did not implement one, causing a
    recursive page fault to occur. A local unprivileged attacker could use to
    cause a denial of service (system crash) or possibly execute arbitrary code
    with administrative privileges. (CVE-2016-1583)
    
    Multiple race conditions where discovered in the Linux kernel's ext4 file
    system. A local user could exploit this flaw to cause a denial of service
    (disk corruption) by writing to a page that is associated with a different
    users file after unsynchronized hole punching and page-fault handling.
    (CVE-2015-8839)
    
    Ralf Spenneberg discovered that the Linux kernel's GTCO digitizer USB
    device driver did not properly validate endpoint descriptors. An attacker
    with physical access could use this to cause a denial of service (system
    crash). (CVE-2016-2187)
    
    Vitaly Kuznetsov discovered that the Linux kernel did not properly suppress
    hugetlbfs support in X86 paravirtualized guests. An attacker in the guest
    OS could cause a denial of service (guest system crash). (CVE-2016-3961)
    
    Kangjie Lu discovered an information leak in the ANSI/IEEE 802.2 LLC type 2
    Support implementations in the Linux kernel. A local attacker could use
    this to obtain potentially sensitive information from kernel memory.
    (CVE-2016-4485)
    
    Kangjie Lu discovered an information leak in the routing netlink socket
    interface (rtnetlink) implementation in the Linux kernel. A local attacker
    could use this to obtain potentially sensitive information from kernel
    memory. (CVE-2016-4486)
    
    Jann Horn discovered that the extended Berkeley Packet Filter (eBPF)
    implementation in the Linux kernel could overflow reference counters on
    systems with more than 32GB of physical ram and with RLIMIT_MEMLOCK set to
    infinite. A local unprivileged attacker could use to create a use-after-
    free situation, causing a denial of service (system crash) or possibly gain
    administrative privileges. (CVE-2016-4558)
    
    Jann Horn discovered that the InfiniBand interfaces within the Linux kernel
    could be coerced into overwriting kernel memory. A local unprivileged
    attacker could use this to possibly gain administrative privileges on
    systems where InifiniBand related kernel modules are loaded.
    (CVE-2016-4565)
    
    It was discovered that in some situations the Linux kernel did not handle
    propagated mounts correctly. A local unprivileged attacker could use this
    to cause a denial of service (system crash). (CVE-2016-4581)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1012-raspi2   4.4.0-1012.16
    
    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:
      http://www.ubuntu.com/usn/usn-3007-1
      CVE-2015-8839, CVE-2016-1583, CVE-2016-2117, CVE-2016-2187,
      CVE-2016-3961, CVE-2016-4485, CVE-2016-4486, CVE-2016-4558,
      CVE-2016-4565, CVE-2016-4581
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1012.16
    
    
    
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