========================================================================== Ubuntu Security Notice USN-4917-1 April 15, 2021 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke-5.3, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe, linux-hwe-5.4, linux-hwe-5.8, linux-kvm, linux-oem-5.10, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4, linux-raspi2-5.3 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS 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: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud systems - linux-raspi: Linux kernel for Raspberry Pi (V8) systems - linux-gkeop: Linux kernel for Google Container Engine (GKE) systems - linux-hwe-5.8: Linux hardware enablement (HWE) kernel - linux-oem-5.10: Linux kernel for OEM systems - linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems - linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems - linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems - linux-gke-5.3: Linux kernel for Google Container Engine (GKE) systems - linux-gke-5.4: Linux kernel for Google Container Engine (GKE) systems - linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems - linux-hwe: Linux hardware enablement (HWE) kernel - linux-hwe-5.4: Linux hardware enablement (HWE) kernel - linux-oracle-5.4: Linux kernel for Oracle Cloud systems - linux-raspi-5.4: Linux kernel for Raspberry Pi (V8) systems - linux-raspi2-5.3: Linux kernel for Raspberry Pi (V8) systems Details: It was discovered that the overlayfs implementation in the Linux kernel did not properly validate the application of file system capabilities with respect to user namespaces. A local attacker could use this to gain elevated privileges. (CVE-2021-3493) Vincent Dehors discovered that the shiftfs file system in the Ubuntu Linux kernel did not properly handle faults in copy_from_user() when passing through ioctls to an underlying file system. A local attacker could use this to cause a denial of service (memory exhaustion) or execute arbitrary code. (CVE-2021-3492) Piotr Krysiuk discovered that the BPF JIT compiler for x86 in the Linux kernel did not properly validate computation of branch displacements in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-29154) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.10: linux-image-5.8.0-1021-raspi 5.8.0-1021.24 linux-image-5.8.0-1021-raspi-nolpae 5.8.0-1021.24 linux-image-5.8.0-1024-kvm 5.8.0-1024.26 linux-image-5.8.0-1026-oracle 5.8.0-1026.27 linux-image-5.8.0-1028-gcp 5.8.0-1028.29 linux-image-5.8.0-1029-azure 5.8.0-1029.31 linux-image-5.8.0-1030-aws 5.8.0-1030.32 linux-image-5.8.0-50-generic 5.8.0-50.56 linux-image-5.8.0-50-generic-64k 5.8.0-50.56 linux-image-5.8.0-50-generic-lpae 5.8.0-50.56 linux-image-5.8.0-50-lowlatency 5.8.0-50.56 linux-image-aws 5.8.0.1030.32 linux-image-azure 5.8.0.1029.29 linux-image-gcp 5.8.0.1028.28 linux-image-generic 5.8.0.50.55 linux-image-generic-64k 5.8.0.50.55 linux-image-generic-lpae 5.8.0.50.55 linux-image-gke 5.8.0.1028.28 linux-image-kvm 5.8.0.1024.26 linux-image-lowlatency 5.8.0.50.55 linux-image-oem-20.04 5.8.0.50.55 linux-image-oracle 5.8.0.1026.25 linux-image-raspi 5.8.0.1021.24 linux-image-raspi-nolpae 5.8.0.1021.24 linux-image-virtual 5.8.0.50.55 Ubuntu 20.04 LTS: linux-image-5.10.0-1022-oem 5.10.0-1022.23 linux-image-5.4.0-1014-gkeop 5.4.0-1014.15 linux-image-5.4.0-1034-raspi 5.4.0-1034.37 linux-image-5.4.0-1038-kvm 5.4.0-1038.39 linux-image-5.4.0-1042-gcp 5.4.0-1042.45 linux-image-5.4.0-1043-oracle 5.4.0-1043.46 linux-image-5.4.0-1045-aws 5.4.0-1045.47 linux-image-5.4.0-1046-azure 5.4.0-1046.48 linux-image-5.4.0-72-generic 5.4.0-72.80 linux-image-5.4.0-72-generic-lpae 5.4.0-72.80 linux-image-5.4.0-72-lowlatency 5.4.0-72.80 linux-image-5.8.0-50-generic 5.8.0-50.56~20.04.1 linux-image-5.8.0-50-generic-64k 5.8.0-50.56~20.04.1 linux-image-5.8.0-50-generic-lpae 5.8.0-50.56~20.04.1 linux-image-5.8.0-50-lowlatency 5.8.0-50.56~20.04.1 linux-image-aws 5.4.0.1045.46 linux-image-azure 5.4.0.1046.44 linux-image-gcp 5.4.0.1042.51 linux-image-generic 5.4.0.72.75 linux-image-generic-64k-hwe-20.04 5.8.0.50.56~20.04.34 linux-image-generic-hwe-20.04 5.8.0.50.56~20.04.34 linux-image-generic-lpae 5.4.0.72.75 linux-image-generic-lpae-hwe-20.04 5.8.0.50.56~20.04.34 linux-image-gkeop 5.4.0.1014.17 linux-image-gkeop-5.4 5.4.0.1014.17 linux-image-kvm 5.4.0.1038.36 linux-image-lowlatency 5.4.0.72.75 linux-image-lowlatency-hwe-20.04 5.8.0.50.56~20.04.34 linux-image-oem 5.4.0.72.75 linux-image-oem-20.04b 5.10.0.1022.23 linux-image-oem-osp1 5.4.0.72.75 linux-image-oracle 5.4.0.1043.40 linux-image-raspi 5.4.0.1034.69 linux-image-raspi2 5.4.0.1034.69 linux-image-virtual 5.4.0.72.75 linux-image-virtual-hwe-20.04 5.8.0.50.56~20.04.34 Ubuntu 18.04 LTS: linux-image-5.3.0-1039-raspi2 5.3.0-1039.41 linux-image-5.3.0-1042-gke 5.3.0-1042.45 linux-image-5.3.0-73-generic 5.3.0-73.69 linux-image-5.3.0-73-lowlatency 5.3.0-73.69 linux-image-5.4.0-1014-gkeop 5.4.0-1014.15~18.04.1 linux-image-5.4.0-1034-raspi 5.4.0-1034.37~18.04.1 linux-image-5.4.0-1042-gcp 5.4.0-1042.45~18.04.1 linux-image-5.4.0-1042-gke 5.4.0-1042.44~18.04.1 linux-image-5.4.0-1043-oracle 5.4.0-1043.46~18.04.1 linux-image-5.4.0-1045-aws 5.4.0-1045.47~18.04.1 linux-image-5.4.0-1046-azure 5.4.0-1046.48~18.04.1 linux-image-5.4.0-72-generic 5.4.0-72.80~18.04.1 linux-image-5.4.0-72-generic-lpae 5.4.0-72.80~18.04.1 linux-image-5.4.0-72-lowlatency 5.4.0-72.80~18.04.1 linux-image-aws 5.4.0.1045.27 linux-image-azure 5.4.0.1046.25 linux-image-gcp 5.4.0.1042.29 linux-image-generic-hwe-18.04 5.4.0.72.80~18.04.65 linux-image-generic-lpae-hwe-18.04 5.4.0.72.80~18.04.65 linux-image-gke-5.3 5.3.0.1042.25 linux-image-gke-5.4 5.4.0.1042.44~18.04.8 linux-image-gkeop-5.3 5.3.0.73.130 linux-image-gkeop-5.4 5.4.0.1014.15~18.04.15 linux-image-lowlatency-hwe-18.04 5.4.0.72.80~18.04.65 linux-image-oem 5.4.0.72.80~18.04.65 linux-image-oem-osp1 5.4.0.72.80~18.04.65 linux-image-oracle 5.4.0.1043.46~18.04.25 linux-image-raspi-hwe-18.04 5.4.0.1034.36 linux-image-raspi2-hwe-18.04 5.3.0.1039.28 linux-image-snapdragon-hwe-18.04 5.4.0.72.80~18.04.65 linux-image-virtual-hwe-18.04 5.4.0.72.80~18.04.65 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://ubuntu.com/security/notices/USN-4917-1 CVE-2021-29154, CVE-2021-3492, CVE-2021-3493 Package Information: https://launchpad.net/ubuntu/+source/linux/5.8.0-50.56 https://launchpad.net/ubuntu/+source/linux-aws/5.8.0-1030.32 https://launchpad.net/ubuntu/+source/linux-azure/5.8.0-1029.31 https://launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1028.29 https://launchpad.net/ubuntu/+source/linux-kvm/5.8.0-1024.26 https://launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1026.27 https://launchpad.net/ubuntu/+source/linux-raspi/5.8.0-1021.24 https://launchpad.net/ubuntu/+source/linux/5.4.0-72.80 https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1045.47 https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1046.48 https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1042.45 https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1014.15 https://launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-50.56~20.04.1 https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1038.39 https://launchpad.net/ubuntu/+source/linux-oem-5.10/5.10.0-1022.23 https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1043.46 https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1034.37 https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1045.47~18.04.1 https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1046.48~18.04.1 https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1042.45~18.04.1 https://launchpad.net/ubuntu/+source/linux-gke-5.3/5.3.0-1042.45 https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1042.44~18.04.1 https://launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1014.15~18.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/5.3.0-73.69 https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-72.80~18.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1043.46~18.04.1 https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1034.37~18.04.1 https://launchpad.net/ubuntu/+source/linux-raspi2-5.3/5.3.0-1039.41