Ubuntu 4076-1: Linux kernel vulnerabilities

    Date25 Jul 2019
    CategoryUbuntu
    2486
    Posted ByLinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4076-1
    July 25, 2019
    
    linux, linux-aws, linux-kvm, 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 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
    
    Details:
    
    It was discovered that a race condition existed in the Serial Attached SCSI
    (SAS) implementation in the Linux kernel. A local attacker could possibly
    use this to cause a denial of service (system crash) or execute arbitrary
    code. (CVE-2018-20836)
    
    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 Bluetooth Human Interface Device Protocol (HIDP)
    implementation in the Linux kernel did not properly verify strings were
    NULL terminated in certain situations. A local attacker could use this to
    expose sensitive information (kernel memory). (CVE-2019-11884)
    
    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)
    
    Hugues Anguelkov discovered that the Broadcom Wifi driver in the Linux
    kernel did not properly prevent remote firmware events from being processed
    for USB Wifi devices. A physically proximate attacker could use this to
    send firmware events to the device. (CVE-2019-9503)
    
    It was discovered that an integer overflow existed in the Freescale
    (PowerPC) hypervisor manager in the Linux kernel. A local attacker with
    write access to /dev/fsl-hv could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2019-10142)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1052-kvm      4.4.0-1052.59
      linux-image-4.4.0-1088-aws      4.4.0-1088.99
      linux-image-4.4.0-1117-raspi2   4.4.0-1117.126
      linux-image-4.4.0-157-generic   4.4.0-157.185
      linux-image-4.4.0-157-generic-lpae  4.4.0-157.185
      linux-image-4.4.0-157-lowlatency  4.4.0-157.185
      linux-image-4.4.0-157-powerpc-e500mc  4.4.0-157.185
      linux-image-4.4.0-157-powerpc-smp  4.4.0-157.185
      linux-image-4.4.0-157-powerpc64-emb  4.4.0-157.185
      linux-image-4.4.0-157-powerpc64-smp  4.4.0-157.185
      linux-image-aws                 4.4.0.1088.91
      linux-image-generic             4.4.0.157.165
      linux-image-generic-lpae        4.4.0.157.165
      linux-image-kvm                 4.4.0.1052.52
      linux-image-lowlatency          4.4.0.157.165
      linux-image-powerpc-e500mc      4.4.0.157.165
      linux-image-powerpc-smp         4.4.0.157.165
      linux-image-powerpc64-emb       4.4.0.157.165
      linux-image-powerpc64-smp       4.4.0.157.165
      linux-image-raspi2              4.4.0.1117.117
      linux-image-virtual             4.4.0.157.165
    
    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/4076-1
      CVE-2018-20836, CVE-2019-10142, CVE-2019-11833, CVE-2019-11884,
      CVE-2019-2054, CVE-2019-9503
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-157.185
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1088.99
      https://launchpad.net/ubuntu/+source/linux-kvm/4.4.0-1052.59
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1117.126
    
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