========================================================================= 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