========================================================================== Ubuntu Security Notice USN-5091-1 September 28, 2021 linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - 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-gke: Linux kernel for Google Container Engine (GKE) systems - linux-gkeop: Linux kernel for Google Container Engine (GKE) systems - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud 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-5.4: Linux kernel for Google Container Engine (GKE) systems - linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems - linux-hwe-5.4: Linux hardware enablement (HWE) kernel - linux-oracle-5.4: Linux kernel for Oracle Cloud systems Details: Ofek Kirzner, Adam Morrison, Benedict Schlueter, and Piotr Krysiuk discovered that the BPF verifier in the Linux kernel missed possible mispredicted branches due to type confusion, allowing a side-channel attack. An attacker could use this to expose sensitive information. (CVE-2021-33624) It was discovered that the tracing subsystem in the Linux kernel did not properly keep track of per-cpu ring buffer state. A privileged attacker could use this to cause a denial of service. (CVE-2021-3679) Alexey Kardashevskiy discovered that the KVM implementation for PowerPC systems in the Linux kernel did not properly validate RTAS arguments in some situations. An attacker in a guest vm could use this to cause a denial of service (host OS crash) or possibly execute arbitrary code. (CVE-2021-37576) It was discovered that the Virtio console implementation in the Linux kernel did not properly validate input lengths in some situations. A local attacker could possibly use this to cause a denial of service (system crash). (CVE-2021-38160) Michael Wakabayashi discovered that the NVSv4 client implementation in the Linux kernel did not properly order connection setup operations. An attacker controlling a remote NFS server could use this to cause a denial of service on the client. (CVE-2021-38199) It was discovered that the MAX-3421 host USB device driver in the Linux kernel did not properly handle device removal events. A physically proximate attacker could use this to cause a denial of service (system crash). (CVE-2021-38204) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.4.0-1024-gkeop 5.4.0-1024.25 linux-image-5.4.0-1047-kvm 5.4.0-1047.49 linux-image-5.4.0-1053-gcp 5.4.0-1053.57 linux-image-5.4.0-1053-gke 5.4.0-1053.56 linux-image-5.4.0-1055-oracle 5.4.0-1055.59 linux-image-5.4.0-1057-aws 5.4.0-1057.60 linux-image-5.4.0-1059-azure 5.4.0-1059.62 linux-image-5.4.0-88-generic 5.4.0-88.99 linux-image-5.4.0-88-generic-lpae 5.4.0-88.99 linux-image-5.4.0-88-lowlatency 5.4.0-88.99 linux-image-aws-lts-20.04 5.4.0.1057.60 linux-image-azure-lts-20.04 5.4.0.1059.57 linux-image-gcp-lts-20.04 5.4.0.1053.63 linux-image-generic 5.4.0.88.92 linux-image-generic-lpae 5.4.0.88.92 linux-image-gke 5.4.0.1053.63 linux-image-gke-5.4 5.4.0.1053.63 linux-image-gkeop 5.4.0.1024.27 linux-image-gkeop-5.4 5.4.0.1024.27 linux-image-kvm 5.4.0.1047.46 linux-image-lowlatency 5.4.0.88.92 linux-image-oem 5.4.0.88.92 linux-image-oem-osp1 5.4.0.88.92 linux-image-oracle-lts-20.04 5.4.0.1055.55 linux-image-virtual 5.4.0.88.92 Ubuntu 18.04 LTS: linux-image-5.4.0-1024-gkeop 5.4.0-1024.25~18.04.1 linux-image-5.4.0-1053-gcp 5.4.0-1053.57~18.04.1 linux-image-5.4.0-1053-gke 5.4.0-1053.56~18.04.1 linux-image-5.4.0-1055-oracle 5.4.0-1055.59~18.04.1 linux-image-5.4.0-1057-aws 5.4.0-1057.60~18.04.1 linux-image-5.4.0-1059-azure 5.4.0-1059.62~18.04.1 linux-image-5.4.0-87-generic 5.4.0-87.98~18.04.1 linux-image-5.4.0-87-generic-lpae 5.4.0-87.98~18.04.1 linux-image-5.4.0-87-lowlatency 5.4.0-87.98~18.04.1 linux-image-aws 5.4.0.1057.40 linux-image-azure 5.4.0.1059.39 linux-image-gcp 5.4.0.1053.39 linux-image-generic-hwe-18.04 5.4.0.87.98~18.04.78 linux-image-generic-lpae-hwe-18.04 5.4.0.87.98~18.04.78 linux-image-gke-5.4 5.4.0.1053.56~18.04.18 linux-image-gkeop-5.4 5.4.0.1024.25~18.04.25 linux-image-lowlatency-hwe-18.04 5.4.0.87.98~18.04.78 linux-image-oem 5.4.0.87.98~18.04.78 linux-image-oem-osp1 5.4.0.87.98~18.04.78 linux-image-oracle 5.4.0.1055.59~18.04.35 linux-image-snapdragon-hwe-18.04 5.4.0.87.98~18.04.78 linux-image-virtual-hwe-18.04 5.4.0.87.98~18.04.78 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-5091-1 CVE-2021-33624, CVE-2021-3679, CVE-2021-37576, CVE-2021-38160, CVE-2021-38199, CVE-2021-38204 Package Information: https://launchpad.net/ubuntu/+source/linux/5.4.0-88.99 https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1057.60 https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1059.62 https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1053.57 https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1053.56 https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1024.25 https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1047.49 https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1055.59 https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1057.60~18.04.1 https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1059.62~18.04.1 https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1053.57~18.04.1 https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1053.56~18.04.1 https://launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1024.25~18.04.1 https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-87.98~18.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1055.59~18.04.1