========================================================================== Ubuntu Security Notice USN-4680-1 January 06, 2021 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-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-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: It was discovered that debugfs in the Linux kernel as used by blktrace contained a use-after-free in some situations. A privileged local attacker could possibly use this to cause a denial of service (system crash). (CVE-2019-19770) It was discovered that a race condition existed in the binder IPC implementation in the Linux kernel, 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-2020-0423) Daniele Antonioli, Nils Ole Tippenhauer, and Kasper Rasmussen discovered that legacy pairing and secure-connections pairing authentication in the Bluetooth protocol could allow an unauthenticated user to complete authentication without pairing credentials via adjacent access. A physically proximate attacker could use this to impersonate a previously paired Bluetooth device. (CVE-2020-10135) It was discovered that the console keyboard driver in the Linux kernel contained a race condition. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-25656) Minh Yuan discovered that the tty driver in the Linux kernel contained race conditions when handling fonts. A local attacker could possibly use this to expose sensitive information (kernel memory). (CVE-2020-25668) Keyu Man discovered that the ICMP global rate limiter in the Linux kernel could be used to assist in scanning open UDP ports. A remote attacker could use to facilitate attacks on UDP based services that depend on source port randomization. (CVE-2020-25705) Jinoh Kang discovered that the Xen event channel infrastructure in the Linux kernel contained a race condition. An attacker in guest could possibly use this to cause a denial of service (dom0 crash). (CVE-2020-27675) Daniel Axtens discovered that PowerPC RTAS implementation in the Linux kernel did not properly restrict memory accesses in some situations. A privileged local attacker could use this to arbitrarily modify kernel memory, potentially bypassing kernel lockdown restrictions. (CVE-2020-27777) Minh Yuan discovered that the framebuffer console driver in the Linux kernel did not properly handle fonts in some conditions. A local attacker could use this to cause a denial of service (system crash) or possibly expose sensitive information (kernel memory). (CVE-2020-28974) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1062-oracle 4.15.0-1062.68 linux-image-4.15.0-1077-gke 4.15.0-1077.82 linux-image-4.15.0-1077-raspi2 4.15.0-1077.82 linux-image-4.15.0-1082-kvm 4.15.0-1082.84 linux-image-4.15.0-1091-aws 4.15.0-1091.96 linux-image-4.15.0-1091-gcp 4.15.0-1091.104 linux-image-4.15.0-1094-snapdragon 4.15.0-1094.103 linux-image-4.15.0-1103-azure 4.15.0-1103.114 linux-image-4.15.0-129-generic 4.15.0-129.132 linux-image-4.15.0-129-generic-lpae 4.15.0-129.132 linux-image-4.15.0-129-lowlatency 4.15.0-129.132 linux-image-aws-lts-18.04 4.15.0.1091.93 linux-image-azure-lts-18.04 4.15.0.1103.76 linux-image-gcp-lts-18.04 4.15.0.1091.109 linux-image-generic 4.15.0.129.116 linux-image-generic-lpae 4.15.0.129.116 linux-image-gke 4.15.0.1077.81 linux-image-gke-4.15 4.15.0.1077.81 linux-image-kvm 4.15.0.1082.78 linux-image-lowlatency 4.15.0.129.116 linux-image-oracle-lts-18.04 4.15.0.1062.72 linux-image-powerpc-e500mc 4.15.0.129.116 linux-image-powerpc-smp 4.15.0.129.116 linux-image-powerpc64-emb 4.15.0.129.116 linux-image-powerpc64-smp 4.15.0.129.116 linux-image-raspi2 4.15.0.1077.74 linux-image-snapdragon 4.15.0.1094.97 linux-image-virtual 4.15.0.129.116 Ubuntu 16.04 LTS: linux-image-4.15.0-1062-oracle 4.15.0-1062.68~16.04.1 linux-image-4.15.0-1091-aws 4.15.0-1091.96~16.04.1 linux-image-4.15.0-1091-gcp 4.15.0-1091.104~16.04.1 linux-image-4.15.0-1103-azure 4.15.0-1103.114~16.04.1 linux-image-4.15.0-129-generic 4.15.0-129.132~16.04.1 linux-image-4.15.0-129-generic-lpae 4.15.0-129.132~16.04.1 linux-image-4.15.0-129-lowlatency 4.15.0-129.132~16.04.1 linux-image-aws-hwe 4.15.0.1091.85 linux-image-azure 4.15.0.1103.96 linux-image-gcp 4.15.0.1091.92 linux-image-generic-hwe-16.04 4.15.0.129.128 linux-image-generic-lpae-hwe-16.04 4.15.0.129.128 linux-image-gke 4.15.0.1091.92 linux-image-lowlatency-hwe-16.04 4.15.0.129.128 linux-image-oem 4.15.0.129.128 linux-image-oracle 4.15.0.1062.51 linux-image-virtual-hwe-16.04 4.15.0.129.128 Ubuntu 14.04 ESM: linux-image-4.15.0-1103-azure 4.15.0-1103.114~14.04.1 linux-image-azure 4.15.0.1103.78 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://usn.ubuntu.com/4680-1 CVE-2019-19770, CVE-2020-0423, CVE-2020-10135, CVE-2020-25656, CVE-2020-25668, CVE-2020-25705, CVE-2020-27675, CVE-2020-27777, CVE-2020-28974 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-129.132 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1091.96 https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1103.114 https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1091.104 https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1077.82 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1082.84 https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1062.68 https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1077.82 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1094.103 https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1091.96~16.04.1 https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1103.114~16.04.1 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1091.104~16.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-129.132~16.04.1 https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1062.68~16.04.1