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Ubuntu 20.04 LTS: USN-4411-1 Critical: Multiple Kernel Issues

Several security issues were fixed in the Linux kernel.. =========================================================================Ubuntu Security Notice USN-4411-1 July 02, 2020 linux, linux-aws, linux-gcp, linux-kvm, linux-oracle, linux-riscv vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 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-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-riscv: Linux kernel for RISC-V systems Details: It was discovered that the elf handling code in the Linux kernel did not initialize memory before using it in certain situations. A local attacker could use this to possibly expose sensitive information (kernel memory). (CVE-2020-10732) Matthew Sheets discovered that the SELinux network label handling implementation in the Linux kernel could be coerced into de-referencing a NULL pointer. A remote attacker could use this to cause a denial of service (system crash). (CVE-2020-10711) It was discovered that the SCSI generic (sg) driver in the Linux kernel did not properly handle certain error conditions correctly. A local privileged attacker could use this to cause a denial of service (system crash). (CVE-2020-12770) It was discovered that the USB Gadget device driver in the Linux kernel did not validate arguments passed from configfs in some situations. A local attacker could possibly use this to cause a denial of service (system crash) or possibly expose sensitive information. (CVE-2020-13143) It was discovered that the KVM implementation in the Linux kernel did not properly deallocate memory on initialization for some processors. A local attacker could possibly use this to cause a denial ofservice. (CVE-2020-12768) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.4.0-1018-aws 5.4.0-1018.18 linux-image-5.4.0-1019-gcp 5.4.0-1019.19 linux-image-5.4.0-1019-oracle 5.4.0-1019.19 linux-image-5.4.0-28-generic 5.4.0-28.32 linux-image-5.4.0-40-generic 5.4.0-40.44 linux-image-5.4.0-40-generic-lpae 5.4.0-40.44 linux-image-5.4.0-40-lowlatency 5.4.0-40.44 linux-image-aws 5.4.0.1018.19 linux-image-gcp 5.4.0.1019.17 linux-image-generic 5.4.0.28.35 linux-image-generic-lpae 5.4.0.40.43 linux-image-gke 5.4.0.1019.17 linux-image-kvm 5.4.0.1018.17 linux-image-lowlatency 5.4.0.40.43 linux-image-oem 5.4.0.40.43 linux-image-oem-osp1 5.4.0.40.43 linux-image-oracle 5.4.0.1019.17 linux-image-virtual 5.4.0.28.35 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-4411-1 CVE-2020-10711, CVE-2020-10732, CVE-2020-12768, CVE-2020-12770, CVE-2020-13143 Package Information: https://launchpad.net/ubuntu/+source/linux/5.4.0-40.44 https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1018.18 https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1019.19 https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1018.18 https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1019.19 https://launchpad.net/ubuntu/+source/linux-riscv/5.4.0-28.32 . Urgent vulnerabilities resolved in Ubuntu's Linux kernel tackling various attack vectors needing swift patching.. Linux Kernel Updates, Ubuntu Security Notice, Security Issues, Kernel Exploits, System Integrity. . Severity: Critical. LinuxSecurity.com Team

Jul 02, 2020 •Critical Ubuntu