Ubuntu 4367-2: Linux kernel regression

    Date 28 May 2020
    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
    USN-4367-1 introduced a regression in the Linux kernel.
    Software Description:
    - linux: Linux kernel
    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
    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.
    Package Information:

    LinuxSecurity Poll

    How do you feel about the elimination of the terms 'blacklist' and 'slave' from the Linux kernel?

    No answer selected. Please try again.
    Please select either existing option or enter your own, however not both.
    Please select minimum 0 answer(s) and maximum 3 answer(s).
    [{"id":"112","title":"I strongly support this change - racially charged language should not be used in the code and documentation of the kernel and other open-source projects.","votes":"7","type":"x","order":"1","pct":18.42,"resources":[]},{"id":"113","title":"I'm indifferent - this small change will not affect broader issues of racial insensitivity and white privilege.","votes":"4","type":"x","order":"2","pct":10.53,"resources":[]},{"id":"114","title":"I'm opposed to this change - there is no need to change language that has been used for years. It doesn't make sense for people to take offense to terminology used in community projects.","votes":"27","type":"x","order":"3","pct":71.05,"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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