Ubuntu 4367-2: Linux kernel regression

    Date 28 May 2020
    200
    Posted By LinuxSecurity Advisories
    USN-4367-1 introduced a regression in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4367-2
    May 28, 2020
    
    linux regression
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 20.04 LTS
    
    Summary:
    
    USN-4367-1 introduced a regression in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    
    Details:
    
    USN-4367-1 fixed vulnerabilities in the 5.4 Linux kernel. Unfortunately,
    that update introduced a regression in overlayfs. This update corrects
    the problem.
    
    We apologize for the inconvenience.
    
    Original advisory details:
    
     It was discovered that the btrfs implementation in the Linux kernel did not
     properly detect that a block was marked dirty in some situations. An
     attacker could use this to specially craft a file system image that, when
     unmounted, could cause a denial of service (system crash). (CVE-2019-19377)
    
     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 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 20.04 LTS:
      linux-image-5.4.0-33-generic    5.4.0-33.37
      linux-image-5.4.0-33-generic-lpae  5.4.0-33.37
      linux-image-5.4.0-33-lowlatency  5.4.0-33.37
      linux-image-generic             5.4.0.33.38
      linux-image-generic-lpae        5.4.0.33.38
      linux-image-lowlatency          5.4.0.33.38
      linux-image-oem                 5.4.0.33.38
      linux-image-oem-osp1            5.4.0.33.38
      linux-image-virtual             5.4.0.33.38
    
    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/4367-2
      https://usn.ubuntu.com/4367-1
      https://launchpad.net/bugs/1879690
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/5.4.0-33.37
    

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