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Ubuntu 20.04 LTS: USN-5116-2 Critical: Kernel Denial Of Service

Several security issues were fixed in the Linux kernel.. =========================================================================Ubuntu Security Notice USN-5116-2 October 22, 2021 linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-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-aws: Linux kernel for Amazon Web Services (AWS) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gke: Linux kernel for Google Container Engine (GKE) systems - linux-gkeop: Linux kernel for Google Container Engine (GKE) systems - linux-oracle: Linux kernel for Oracle Cloud systems - linux-raspi: Linux kernel for Raspberry Pi systems - linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems - linux-azure-5.4: Linux kernel version specific cloud tools for version 5.4.0-1062 - 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-oracle-5.4: Linux kernel for Oracle Cloud systems - linux-raspi-5.4: Linux kernel for Raspberry Pi systems Details: It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An attacker could possibly use this to expose sensitive information (WiFi network traffic). (CVE-2020-3702) Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private clones in some situations. An attacker could use this to expose sensitive information. (CVE-2021-3732) It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly compute the access permissions for shadow pages in some situations. A local attacker coulduse this to cause a denial of service. (CVE-2021-38198) It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the Linux kernel could report pointer addresses in some situations. An attacker could use this information to ease the exploitation of another vulnerability. (CVE-2021-38205) It was discovered that the ext4 file system in the Linux kernel contained a race condition when writing xattrs to an inode. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. (CVE-2021-40490) It was discovered that the 6pack network protocol driver in the Linux kernel did not properly perform validation checks. A privileged attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-42008) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.4.0-1025-gkeop 5.4.0-1025.26 linux-image-5.4.0-1045-raspi 5.4.0-1045.49 linux-image-5.4.0-1054-gke 5.4.0-1054.57 linux-image-5.4.0-1056-oracle 5.4.0-1056.60 linux-image-5.4.0-1058-aws 5.4.0-1058.61 linux-image-5.4.0-1062-azure 5.4.0-1062.65 linux-image-aws-lts-20.04 5.4.0.1058.61 linux-image-azure-lts-20.04 5.4.0.1062.60 linux-image-gke 5.4.0.1054.64 linux-image-gke-5.4 5.4.0.1054.64 linux-image-gkeop 5.4.0.1025.28 linux-image-gkeop-5.4 5.4.0.1025.28 linux-image-oracle-lts-20.04 5.4.0.1056.56 linux-image-raspi 5.4.0.1045.80 linux-image-raspi2 5.4.0.1045.80 Ubuntu 18.04 LTS: linux-image-5.4.0-1025-gkeop 5.4.0-1025.26~18.04.1 linux-image-5.4.0-1045-raspi 5.4.0-1045.49~18.04.1 linux-image-5.4.0-1054-gke 5.4.0-1054.57~18.04.1 linux-image-5.4.0-1056-oracle 5.4.0-1056.60~18.04.1 linux-image-5.4.0-1058-aws 5.4.0-1058.61~18.04.3 linux-image-5.4.0-1062-azure 5.4.0-1062.65~18.04.1 linux-image-aws 5.4.0.1058.41 linux-image-azure 5.4.0.1062.42 linux-image-gke-5.4 5.4.0.1054.57~18.04.19 linux-image-gkeop-5.4 5.4.0.1025.26~18.04.26 linux-image-oracle 5.4.0.1056.60~18.04.36 linux-image-raspi-hwe-18.04 5.4.0.1045.48 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-5116-2 https://ubuntu.com/security/notices/USN-5116-1 CVE-2020-3702, CVE-2021-3732, CVE-2021-38198, CVE-2021-38205, CVE-2021-40490, CVE-2021-42008 Package Information: https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1058.61 https://launchpad.net/ubuntu/+source/linux-azure/5.4.0-1062.65 https://launchpad.net/ubuntu/+source/linux-gke/5.4.0-1054.57 https://launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1025.26 https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1056.60 https://launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1045.49 https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1058.61~18.04.3 https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1062.65~18.04.1 https://launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1054.57~18.04.1 https://launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1025.26~18.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1056.60~18.04.1 https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1045.49~18.04.1 . The Debian operating system's kernel is undergoing vital enhancements aimed at addressing multiple vulnerabilities, including potential data breaches and denial ofservice attacks.. Ubuntu Kernel Update, Linux Kernel Security, System Vulnerabilities, Cloud System Security. . Severity: Critical. LinuxSecurity.com Team

Oct 21, 2021 •Critical Ubuntu