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Ubuntu 20.04 LTS: Urgent USN-5051-1 Updates for Bluetooth & Network Issues

Several security issues were fixed in the Linux kernel.. =========================================================================Ubuntu Security Notice USN-5050-1 August 24, 2021 linux-aws-5.8, linux-azure-5.8, linux-gcp-5.8, linux-oracle-5.8 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-aws-5.8: Linux kernel for Amazon Web Services (AWS) systems - linux-azure-5.8: Linux kernel for Microsoft Azure cloud systems - linux-gcp-5.8: Linux kernel for Google Cloud Platform (GCP) systems - linux-oracle-5.8: Linux kernel for Oracle Cloud systems Details: It was discovered that the bluetooth subsystem in the Linux kernel did not properly perform access control. An authenticated attacker could possibly use this to expose sensitive information. (CVE-2020-26558, CVE-2021-0129) Michael Brown discovered that the Xen netback driver in the Linux kernel did not properly handle malformed packets from a network PV frontend, leading to a use-after-free vulnerability. An attacker in a guest VM could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2021-28691) It was discovered that the bluetooth subsystem in the Linux kernel did not properly handle HCI device initialization failure, leading to a double-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2021-3564) It was discovered that the bluetooth subsystem in the Linux kernel did not properly handle HCI device detach events, leading to a use-after-free vulnerability. An attacker could use this to cause a denial of service or possibly execute arbitrary code. (CVE-2021-3573) It was discovered that the NFC implementation in the Linux kernel did not properly handle failed connect events leading to a NULL pointer dereference. A local attacker could usethis to cause a denial of service. (CVE-2021-38208) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.8.0-1038-oracle 5.8.0-1038.39~20.04.1 linux-image-5.8.0-1039-gcp 5.8.0-1039.41 linux-image-5.8.0-1040-azure 5.8.0-1040.43~20.04.1 linux-image-5.8.0-1042-aws 5.8.0-1042.44~20.04.1 linux-image-aws 5.8.0.1042.44~20.04.14 linux-image-azure 5.8.0.1040.43~20.04.12 linux-image-gcp 5.8.0.1039.14 linux-image-oracle 5.8.0.1038.39~20.04.14 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-5050-1 CVE-2020-26558, CVE-2021-0129, CVE-2021-28691, CVE-2021-3564, CVE-2021-3573, CVE-2021-38208 Package Information: https://launchpad.net/ubuntu/+source/linux-aws-5.8/5.8.0-1042.44~20.04.1 https://launchpad.net/ubuntu/+source/linux-azure-5.8/5.8.0-1040.43~20.04.1 https://launchpad.net/ubuntu/+source/linux-gcp-5.8/5.8.0-1039.41 https://launchpad.net/ubuntu/+source/linux-oracle-5.8/5.8.0-1038.39~20.04.1 . A number of vulnerabilities have been addressed in the Linux kernel that affect Ubuntu 20.04 LTS and its derivatives. Users are advised to apply the latest updates promptly.. Ubuntu Update, Linux Kernel Threats, Bluetooth Security Issues, Kernel Vulnerabilities. . Severity: Critical. LinuxSecurity.com Team

Aug 24, 2021 •Critical Ubuntu