Ubuntu 4325-1: Linux kernel vulnerabilities

    Date 07 Apr 2020
    232
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4325-1
    April 07, 2020
    
    linux-azure, linux-gcp, linux-gke-5.0, linux-oem-osp1, linux-oracle-5.0
    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-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-gke-5.0: Linux kernel for Google Container Engine (GKE) systems
    - linux-oem-osp1: Linux kernel for OEM processors
    - linux-oracle-5.0: Linux kernel for Oracle Cloud systems
    
    Details:
    
    It was discovered that the IPMI message handler implementation in the Linux
    kernel did not properly deallocate memory in certain situations. A local
    attacker could use this to cause a denial of service (kernel memory
    exhaustion). (CVE-2019-19046)
    
    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)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-5.0.0-1014-oracle   5.0.0-1014.19
      linux-image-5.0.0-1033-gke      5.0.0-1033.34
      linux-image-5.0.0-1034-gcp      5.0.0-1034.35
      linux-image-5.0.0-1036-azure    5.0.0-1036.38
      linux-image-5.0.0-1047-oem-osp1  5.0.0-1047.52
      linux-image-azure               5.0.0.1036.47
      linux-image-gcp                 5.0.0.1034.38
      linux-image-gke-5.0             5.0.0.1033.21
      linux-image-oem-osp1            5.0.0.1047.50
      linux-image-oracle              5.0.0.1014.15
    
    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/4325-1
      CVE-2019-19046, CVE-2020-8428
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux-azure/5.0.0-1036.38
      https://launchpad.net/ubuntu/+source/linux-gcp/5.0.0-1034.35
      https://launchpad.net/ubuntu/+source/linux-gke-5.0/5.0.0-1033.34
      https://launchpad.net/ubuntu/+source/linux-oem-osp1/5.0.0-1047.52
      https://launchpad.net/ubuntu/+source/linux-oracle-5.0/5.0.0-1014.19
    

    LinuxSecurity Poll

    Do you agree with Linus Torvalds' decision to reject the controversial patch mitigating the Snoop attack on Intel CPUs?

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    /main-polls/28-do-you-agree-with-linus-torvalds-decision-to-reject-the-controversial-patch-mitigating-the-snoop-attack-on-intel-cpus?task=poll.vote&format=json
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    [{"id":"100","title":"Yes - this was undoubtedly the right decision.","votes":"0","type":"x","order":"1","pct":0,"resources":[]},{"id":"101","title":"Not sure...","votes":"1","type":"x","order":"2","pct":100,"resources":[]},{"id":"102","title":"No - he made a big mistake here.","votes":"0","type":"x","order":"3","pct":0,"resources":[]}] ["#ff5b00","#4ac0f2","#b80028","#eef66c","#60bb22","#b96a9a","#62c2cc"] ["rgba(255,91,0,0.7)","rgba(74,192,242,0.7)","rgba(184,0,40,0.7)","rgba(238,246,108,0.7)","rgba(96,187,34,0.7)","rgba(185,106,154,0.7)","rgba(98,194,204,0.7)"] 350
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