Linux Security
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    Linux Security

    Ubuntu 4527-1: Linux kernel vulnerabilities

    Date
    259
    Posted By
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4527-1
    September 22, 2020
    
    linux, linux-aws, linux-lts-xenial, linux-raspi2, linux-snapdragon
    vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 16.04 LTS
    - Ubuntu 14.04 ESM
    
    Summary:
    
    Several security issues were fixed in the Linux kernel.
    
    Software Description:
    - linux: Linux kernel
    - linux-aws: Linux kernel for Amazon Web Services (AWS) systems
    - linux-raspi2: Linux kernel for Raspberry Pi (V8) systems
    - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
    - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty
    
    Details:
    
    It was discovered that the Conexant 23885 TV card device driver for the
    Linux kernel did not properly deallocate memory in some error conditions. A
    local attacker could use this to cause a denial of service (memory
    exhaustion). (CVE-2019-19054)
    
    It was discovered that the Atheros HTC based wireless driver in the Linux
    kernel did not properly deallocate in certain error conditions. A local
    attacker could use this to cause a denial of service (memory exhaustion).
    (CVE-2019-19073, CVE-2019-19074)
    
    Yue Haibing discovered that the Linux kernel did not properly handle
    reference counting in sysfs for network devices in some situations. A local
    attacker could possibly use this to cause a denial of service.
    (CVE-2019-20811)
    
    It was discovered that the F2FS file system in the Linux kernel did not
    properly perform bounds checking in some situations, leading to an out-of-
    bounds read. A local attacker could possibly use this to expose sensitive
    information (kernel memory). (CVE-2019-9445)
    
    It was discovered that the F2FS file system in the Linux kernel did not
    properly validate xattr meta data in some situations, leading to an out-of-
    bounds read. An attacker could use this to construct a malicious F2FS image
    that, when mounted, could expose sensitive information (kernel memory).
    (CVE-2019-9453)
    
    It was discovered that the F2FS file system implementation in the Linux
    kernel did not properly perform bounds checking on xattrs in some
    situations. A local attacker could possibly use this to expose sensitive
    information (kernel memory). (CVE-2020-0067)
    
    It was discovered that the NFS client implementation in the Linux kernel
    did not properly perform bounds checking before copying security labels in
    some situations. A local attacker could use this to cause a denial of
    service (system crash) or possibly execute arbitrary code. (CVE-2020-25212)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 16.04 LTS:
      linux-image-4.4.0-1114-aws      4.4.0-1114.127
      linux-image-4.4.0-1139-raspi2   4.4.0-1139.148
      linux-image-4.4.0-1143-snapdragon  4.4.0-1143.152
      linux-image-4.4.0-190-generic   4.4.0-190.220
      linux-image-4.4.0-190-generic-lpae  4.4.0-190.220
      linux-image-4.4.0-190-lowlatency  4.4.0-190.220
      linux-image-4.4.0-190-powerpc-e500mc  4.4.0-190.220
      linux-image-4.4.0-190-powerpc-smp  4.4.0-190.220
      linux-image-4.4.0-190-powerpc64-emb  4.4.0-190.220
      linux-image-4.4.0-190-powerpc64-smp  4.4.0-190.220
      linux-image-aws                 4.4.0.1114.119
      linux-image-generic             4.4.0.190.196
      linux-image-generic-lpae        4.4.0.190.196
      linux-image-lowlatency          4.4.0.190.196
      linux-image-powerpc-e500mc      4.4.0.190.196
      linux-image-powerpc-smp         4.4.0.190.196
      linux-image-powerpc64-emb       4.4.0.190.196
      linux-image-powerpc64-smp       4.4.0.190.196
      linux-image-raspi2              4.4.0.1139.139
      linux-image-snapdragon          4.4.0.1143.135
      linux-image-virtual             4.4.0.190.196
    
    Ubuntu 14.04 ESM:
      linux-image-4.4.0-1078-aws      4.4.0-1078.82
      linux-image-4.4.0-190-generic   4.4.0-190.220~14.04.1
      linux-image-4.4.0-190-generic-lpae  4.4.0-190.220~14.04.1
      linux-image-4.4.0-190-lowlatency  4.4.0-190.220~14.04.1
      linux-image-4.4.0-190-powerpc-e500mc  4.4.0-190.220~14.04.1
      linux-image-4.4.0-190-powerpc-smp  4.4.0-190.220~14.04.1
      linux-image-4.4.0-190-powerpc64-emb  4.4.0-190.220~14.04.1
      linux-image-4.4.0-190-powerpc64-smp  4.4.0-190.220~14.04.1
      linux-image-aws                 4.4.0.1078.75
      linux-image-generic-lpae-lts-xenial  4.4.0.190.166
      linux-image-generic-lts-xenial  4.4.0.190.166
      linux-image-lowlatency-lts-xenial  4.4.0.190.166
      linux-image-powerpc-e500mc-lts-xenial  4.4.0.190.166
      linux-image-powerpc-smp-lts-xenial  4.4.0.190.166
      linux-image-powerpc64-emb-lts-xenial  4.4.0.190.166
      linux-image-powerpc64-smp-lts-xenial  4.4.0.190.166
      linux-image-virtual-lts-xenial  4.4.0.190.166
    
    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/4527-1
      CVE-2019-19054, CVE-2019-19073, CVE-2019-19074, CVE-2019-20811,
      CVE-2019-9445, CVE-2019-9453, CVE-2020-0067, CVE-2020-25212
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.4.0-190.220
      https://launchpad.net/ubuntu/+source/linux-aws/4.4.0-1114.127
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.4.0-1139.148
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.4.0-1143.152
    

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