Ubuntu 4095-2: Linux kernel (Xenial HWE) vulnerabilities

    Date13 Aug 2019
    CategoryUbuntu
    1574
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4095-2
    August 13, 2019
    
    linux-lts-xenial, linux-aws vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 14.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    USN-4095-1 fixed vulnerabilities in the Linux kernel for Ubuntu 16.04
    LTS. This update provides the corresponding updates for the Linux
    Hardware Enablement (HWE) kernel from Ubuntu 16.04 LTS for Ubuntu
    14.04 ESM.
    
    Eli Biham and Lior Neumann discovered that the Bluetooth implementation in
    the Linux kernel did not properly validate elliptic curve parameters during
    Diffie-Hellman key exchange in some situations. An attacker could use this
    to expose sensitive information. (CVE-2018-5383)
    
    It was discovered that a heap buffer overflow existed in the Marvell
    Wireless LAN device driver for the Linux kernel. An attacker could use this
    to cause a denial of service (system crash) or possibly execute arbitrary
    code. (CVE-2019-10126)
    
    Andrei Vlad Lutas and Dan Lutas discovered that some x86 processors
    incorrectly handle SWAPGS instructions during speculative execution. A
    local attacker could use this to expose sensitive information (kernel
    memory). (CVE-2019-1125)
    
    It was discovered that the ext4 file system implementation in the Linux
    kernel did not properly zero out memory in some situations. A local
    attacker could use this to expose sensitive information (kernel memory).
    (CVE-2019-11833)
    
    It was discovered that the PowerPC dlpar implementation in the Linux kernel
    did not properly check for allocation errors in some situations. A local
    attacker could possibly use this to cause a denial of service (system
    crash). (CVE-2019-12614)
    
    It was discovered that the Linux kernel on ARM processors allowed a tracing
    process to modify a syscall after a seccomp decision had been made on that
    syscall. A local attacker could possibly use this to bypass seccomp
    restrictions. (CVE-2019-2054)
    
    It was discovered that the Marvell Wireless LAN device driver in the Linux
    kernel did not properly validate the BSS descriptor. A local attacker could
    possibly use this to cause a denial of service (system crash) or possibly
    execute arbitrary code. (CVE-2019-3846)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 14.04 ESM:
      linux-image-4.4.0-1050-aws      4.4.0-1050.54
      linux-image-4.4.0-159-generic   4.4.0-159.187~14.04.1
      linux-image-4.4.0-159-generic-lpae  4.4.0-159.187~14.04.1
      linux-image-4.4.0-159-lowlatency  4.4.0-159.187~14.04.1
      linux-image-4.4.0-159-powerpc-e500mc  4.4.0-159.187~14.04.1
      linux-image-4.4.0-159-powerpc-smp  4.4.0-159.187~14.04.1
      linux-image-4.4.0-159-powerpc64-emb  4.4.0-159.187~14.04.1
      linux-image-4.4.0-159-powerpc64-smp  4.4.0-159.187~14.04.1
      linux-image-aws                 4.4.0.1050.51
      linux-image-generic-lpae-lts-xenial  4.4.0.159.140
      linux-image-generic-lts-xenial  4.4.0.159.140
      linux-image-lowlatency-lts-xenial  4.4.0.159.140
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.159.140
      linux-image-powerpc-smp-lts-xenial  4.4.0.159.140
      linux-image-powerpc64-emb-lts-xenial  4.4.0.159.140
      linux-image-powerpc64-smp-lts-xenial  4.4.0.159.140
      linux-image-virtual-lts-xenial  4.4.0.159.140
    
    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/4095-2
      https://usn.ubuntu.com/4095-1
      CVE-2018-5383, CVE-2019-10126, CVE-2019-1125, CVE-2019-11833,
      CVE-2019-12614, CVE-2019-2054, CVE-2019-3846
    
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