Ubuntu 4318-1: Linux kernel vulnerabilities

    Date 06 Apr 2020
    385
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4318-1
    April 06, 2020
    
    linux, linux-hwe vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    - Ubuntu 16.04 LTS
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-hwe: Linux hardware enablement (HWE) kernel
    
    Details:
    
    Al Viro discovered that the vfs layer in the Linux kernel contained a use-
    after-free vulnerability. A local attacker could use this to cause a denial
    of service (system crash) or possibly expose sensitive information (kernel
    memory). (CVE-2020-8428)
    
    Gustavo Romero and Paul Mackerras discovered that the KVM implementation in
    the Linux kernel for PowerPC processors did not properly keep guest state
    separate from host state. A local attacker in a KVM guest could use this to
    cause a denial of service (host system crash). (CVE-2020-8834)
    
    Shijie Luo discovered that the ext4 file system implementation in the Linux
    kernel did not properly check for a too-large journal size. An attacker
    could use this to construct a malicious ext4 image that, when mounted,
    could cause a denial of service (soft lockup). (CVE-2020-8992)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-96-generic   4.15.0-96.97
      linux-image-4.15.0-96-generic-lpae  4.15.0-96.97
      linux-image-4.15.0-96-lowlatency  4.15.0-96.97
      linux-image-generic             4.15.0.96.87
      linux-image-generic-lpae        4.15.0.96.87
      linux-image-lowlatency          4.15.0.96.87
      linux-image-powerpc-e500mc      4.15.0.96.87
      linux-image-powerpc-smp         4.15.0.96.87
      linux-image-powerpc64-emb       4.15.0.96.87
      linux-image-powerpc64-smp       4.15.0.96.87
      linux-image-virtual             4.15.0.96.87
    
    Ubuntu 16.04 LTS:
      linux-image-4.15.0-96-generic   4.15.0-96.97~16.04.1
      linux-image-4.15.0-96-generic-lpae  4.15.0-96.97~16.04.1
      linux-image-4.15.0-96-lowlatency  4.15.0-96.97~16.04.1
      linux-image-generic-hwe-16.04   4.15.0.96.104
      linux-image-generic-lpae-hwe-16.04  4.15.0.96.104
      linux-image-lowlatency-hwe-16.04  4.15.0.96.104
      linux-image-oem                 4.15.0.96.104
      linux-image-virtual-hwe-16.04   4.15.0.96.104
    
    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/4318-1
      CVE-2020-8428, CVE-2020-8834, CVE-2020-8992
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.15.0-96.97
      https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-96.97~16.04.1
    

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