Ubuntu 3742-3: Linux kernel (Trusty HWE) regressions

    Date20 Aug 2018
    CategoryUbuntu
    1492
    Posted ByAnthony Pell
    USN-3742-2 introduced regressions in the Linux Hardware Enablement(HWE) kernel for Ubuntu 12.04 ESM.
    ==========================================================================
    Ubuntu Security Notice USN-3742-3
    August 21, 2018
    
    linux-lts-trusty regressions
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    USN-3742-2 introduced regressions in the Linux Hardware Enablement
    (HWE) kernel for Ubuntu 12.04 ESM.
    
    Software Description:
    - linux-lts-trusty: Linux hardware enablement kernel from Trusty for Precise ESM
    
    Details:
    
    USN-3742-2 introduced mitigations in the Linux Hardware Enablement
    (HWE) kernel for Ubuntu 12.04 ESM to address L1 Terminal Fault (L1TF)
    vulnerabilities (CVE-2018-3620, CVE-2018-3646). Unfortunately, the
    update introduced regressions that caused kernel panics when booting
    in some environments as well as preventing Java applications from
    starting. This update fixes the problems.
    
    We apologize for the inconvenience.
    
    Original advisory details:
    
     It was discovered that memory present in the L1 data cache of an Intel CPU
     core may be exposed to a malicious process that is executing on the CPU
     core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
     attacker in a guest virtual machine could use this to expose sensitive
     information (memory from other guests or the host OS). (CVE-2018-3646)
    
     It was discovered that memory present in the L1 data cache of an Intel CPU
     core may be exposed to a malicious process that is executing on the CPU
     core. This vulnerability is also known as L1 Terminal Fault (L1TF). A local
     attacker could use this to expose sensitive information (memory from the
     kernel or other processes). (CVE-2018-3620)
    
     Andrey Konovalov discovered an out-of-bounds read in the POSIX
     timers subsystem in the Linux kernel. A local attacker could use
     this to cause a denial of service (system crash) or expose sensitive
     information. (CVE-2017-18344)
    
     Juha-Matti Tilli discovered that the TCP implementation in the Linux kernel
     performed algorithmically expensive operations in some situations when
     handling incoming packets. A remote attacker could use this to cause a
     denial of service. (CVE-2018-5390)
    
     Juha-Matti Tilli discovered that the IP implementation in the Linux kernel
     performed algorithmically expensive operations in some situations when
     handling incoming packet fragments. A remote attacker could use this to
     cause a denial of service. (CVE-2018-5391)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      linux-image-3.13.0-156-generic  3.13.0-156.206~precise1
      linux-image-3.13.0-156-generic-lpae  3.13.0-156.206~precise1
      linux-image-generic-lpae-lts-trusty  3.13.0.156.146
      linux-image-generic-lts-trusty  3.13.0.156.146
    
    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/usn/usn-3742-3
      https://usn.ubuntu.com/usn/usn-3742-2
      https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787127
      https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1787258
      https://wiki.ubuntu.com/SecurityTeam/KnowledgeBase/L1TF
    
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