Linux Security
    Linux Security
    Linux Security

    Ubuntu 4578-1: Linux kernel vulnerabilities

    Date 13 Oct 2020
    146
    Posted By LinuxSecurity Advisories
    Several security issues were fixed in the Linux kernel.
    ==========================================================================
    Ubuntu Security Notice USN-4578-1
    October 14, 2020
    
    linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp,
    linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem,
    linux-oracle, linux-raspi2, linux-snapdragon vulnerabilities
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 18.04 LTS
    - 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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems
    - linux-kvm: Linux kernel for cloud environments
    - linux-oem: Linux kernel for OEM systems
    - linux-oracle: Linux kernel for Oracle Cloud systems
    - linux-raspi2: Linux kernel for Raspberry Pi (V8) systems
    - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors
    - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems
    - linux-azure: Linux kernel for Microsoft Azure Cloud systems
    - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems
    - linux-hwe: Linux hardware enablement (HWE) kernel
    
    Details:
    
    Hador Manor discovered that the DCCP protocol implementation in the Linux
    kernel improperly handled socket reuse, leading to a use-after-free
    vulnerability. A local attacker could use this to cause a denial of service
    (system crash) or possibly execute arbitrary code. (CVE-2020-16119)
    
    Wen Xu discovered that the XFS file system in the Linux kernel did not
    properly validate inode metadata in some situations. An attacker could use
    this to construct a malicious XFS image that, when mounted, could cause a
    denial of service (system crash). (CVE-2018-10322)
    
    It was discovered that the btrfs file system in the Linux kernel contained
    a use-after-free vulnerability when merging free space. An attacker could
    use this to construct a malicious btrfs image that, when mounted and
    operated on, could cause a denial of service (system crash).
    (CVE-2019-19448)
    
    Jay Shin discovered that the ext4 file system implementation in the Linux
    kernel did not properly handle directory access with broken indexing,
    leading to an out-of-bounds read vulnerability. A local attacker could use
    this to cause a denial of service (system crash). (CVE-2020-14314)
    
    Giuseppe Scrivano discovered that the overlay file system in the Linux
    kernel did not properly perform permission checks in some situations. A
    local attacker could possibly use this to bypass intended restrictions and
    gain read access to restricted files. (CVE-2020-16120)
    
    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)
    
    It was discovered that the NFC implementation in the Linux kernel did not
    properly perform permissions checks when opening raw sockets. A local
    attacker could use this to create or listen to NFC traffic.
    (CVE-2020-26088)
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 18.04 LTS:
      linux-image-4.15.0-1057-oracle  4.15.0-1057.62
      linux-image-4.15.0-1072-gke     4.15.0-1072.76
      linux-image-4.15.0-1073-raspi2  4.15.0-1073.78
      linux-image-4.15.0-1077-kvm     4.15.0-1077.79
      linux-image-4.15.0-1086-aws     4.15.0-1086.91
      linux-image-4.15.0-1086-gcp     4.15.0-1086.98
      linux-image-4.15.0-1089-snapdragon  4.15.0-1089.98
      linux-image-4.15.0-1099-azure   4.15.0-1099.110
      linux-image-4.15.0-1099-oem     4.15.0-1099.109
      linux-image-4.15.0-121-generic  4.15.0-121.123
      linux-image-4.15.0-121-generic-lpae  4.15.0-121.123
      linux-image-4.15.0-121-lowlatency  4.15.0-121.123
      linux-image-aws-lts-18.04       4.15.0.1086.88
      linux-image-azure-lts-18.04     4.15.0.1099.72
      linux-image-gcp-lts-18.04       4.15.0.1086.104
      linux-image-generic             4.15.0.121.108
      linux-image-generic-lpae        4.15.0.121.108
      linux-image-gke                 4.15.0.1072.76
      linux-image-gke-4.15            4.15.0.1072.76
      linux-image-kvm                 4.15.0.1077.73
      linux-image-lowlatency          4.15.0.121.108
      linux-image-oem                 4.15.0.1099.103
      linux-image-oracle-lts-18.04    4.15.0.1057.67
      linux-image-powerpc-e500mc      4.15.0.121.108
      linux-image-powerpc-smp         4.15.0.121.108
      linux-image-powerpc64-emb       4.15.0.121.108
      linux-image-powerpc64-smp       4.15.0.121.108
      linux-image-raspi2              4.15.0.1073.70
      linux-image-snapdragon          4.15.0.1089.92
      linux-image-virtual             4.15.0.121.108
    
    Ubuntu 16.04 LTS:
      linux-image-4.15.0-1056-oracle  4.15.0-1056.61~16.04.1
      linux-image-4.15.0-1085-aws     4.15.0-1085.90~16.04.1
      linux-image-4.15.0-1086-gcp     4.15.0-1086.98~16.04.1
      linux-image-4.15.0-1098-azure   4.15.0-1098.109~16.04.1
      linux-image-4.15.0-120-generic  4.15.0-120.122~16.04.1
      linux-image-4.15.0-120-generic-lpae  4.15.0-120.122~16.04.1
      linux-image-4.15.0-120-lowlatency  4.15.0-120.122~16.04.1
      linux-image-aws-hwe             4.15.0.1085.81
      linux-image-azure               4.15.0.1098.92
      linux-image-gcp                 4.15.0.1086.87
      linux-image-generic-hwe-16.04   4.15.0.120.121
      linux-image-generic-lpae-hwe-16.04  4.15.0.120.121
      linux-image-gke                 4.15.0.1086.87
      linux-image-lowlatency-hwe-16.04  4.15.0.120.121
      linux-image-oem                 4.15.0.120.121
      linux-image-oracle              4.15.0.1056.46
      linux-image-virtual-hwe-16.04   4.15.0.120.121
    
    Ubuntu 14.04 ESM:
      linux-image-4.15.0-1098-azure   4.15.0-1098.109~14.04.1
      linux-image-azure               4.15.0.1098.74
    
    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/4578-1
      CVE-2018-10322, CVE-2019-19448, CVE-2020-14314, CVE-2020-16119,
      CVE-2020-16120, CVE-2020-25212, CVE-2020-26088
    
    Package Information:
      https://launchpad.net/ubuntu/+source/linux/4.15.0-121.123
      https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1086.91
      https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1099.110
      https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1086.98
      https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1072.76
      https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1077.79
      https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1099.109
      https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1057.62
      https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1073.78
      https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1089.98
      https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1085.90~16.04.1
      https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1098.109~16.04.1
      https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1086.98~16.04.1
      https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-120.122~16.04.1
      https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1056.61~16.04.1
    

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