Linux Security
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    Linux Security

    Ubuntu 4368-1: Linux kernel vulnerabilities

    Date 19 May 2020
    272
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4368-1
    May 19, 2020
    
    linux-gke-5.0, linux-oem-osp1 vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
    - linux-oem-osp1: Linux kernel for OEM systems
    
    Details:
    
    Tristan Madani discovered that the file locking implementation in the Linux
    kernel contained a race condition. A local attacker could possibly use this
    to cause a denial of service or expose sensitive information.
    (CVE-2019-19769)
    
    It was discovered that the Serial CAN interface driver in the Linux kernel
    did not properly initialize data. A local attacker could use this to expose
    sensitive information (kernel memory). (CVE-2020-11494)
    
    It was discovered that the linux kernel did not properly validate certain
    mount options to the tmpfs virtual memory file system. A local attacker
    with the ability to specify mount options could use this to cause a denial
    of service (system crash). (CVE-2020-11565)
    
    It was discovered that the OV51x USB Camera device driver in the Linux
    kernel did not properly validate device metadata. A physically proximate
    attacker could use this to cause a denial of service (system crash).
    (CVE-2020-11608)
    
    It was discovered that the STV06XX USB Camera device driver in the Linux
    kernel did not properly validate device metadata. A physically proximate
    attacker could use this to cause a denial of service (system crash).
    (CVE-2020-11609)
    
    It was discovered that the Xirlink C-It USB Camera device driver in the
    Linux kernel did not properly validate device metadata. A physically
    proximate attacker could use this to cause a denial of service (system
    crash). (CVE-2020-11668)
    
    David Gibson discovered that the Linux kernel on Power9 CPUs did not
    properly save and restore Authority Mask registers state in some
    situations. A local attacker in a guest VM could use this to cause a denial
    of service (host system crash). (CVE-2020-11669)
    
    It was discovered that the block layer in the Linux kernel contained a race
    condition leading to a use-after-free vulnerability. A local attacker could
    possibly use this to cause a denial of service (system crash) or execute
    arbitrary code. (CVE-2020-12657)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-5.0.0-1037-gke      5.0.0-1037.38
      linux-image-5.0.0-1052-oem-osp1  5.0.0-1052.57
      linux-image-gke-5.0             5.0.0.1037.25
      linux-image-oem-osp1            5.0.0.1052.55
    
    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/4368-1
      CVE-2019-19769, CVE-2020-11494, CVE-2020-11565, CVE-2020-11608,
      CVE-2020-11609, CVE-2020-11668, CVE-2020-11669, CVE-2020-12657
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1037.38
      https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1052.57
    

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