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Ubuntu 16.04 LTS USN-6739-1 Critical: Linux Kernel Security Issues

Several security issues were fixed in the Linux kernel.. ========================================================================== Ubuntu Security Notice USN-6739-1 April 19, 2024 linux, linux-aws, linux-kvm, linux-lts-xenial vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 16.04 LTS (Available with Ubuntu Pro) - Ubuntu 14.04 LTS (Available with Ubuntu Pro) 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-kvm: Linux kernel for cloud environments - linux-lts-xenial: Linux hardware enablement kernel from Xenial for Trusty Details: It was discovered that a race condition existed in the instruction emulator of the Linux kernel on Arm 64-bit systems. A local attacker could use this to cause a denial of service (system crash). (CVE-2022-20422) Wei Chen discovered that a race condition existed in the TIPC protocol implementation in the Linux kernel, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2023-1382) Jose Oliveira and Rodrigo Branco discovered that the Spectre Variant 2 mitigations with prctl syscall were insufficient in some situations. A local attacker could possibly use this to expose sensitive information. (CVE-2023-1998) Daniele Antonioli discovered that the Secure Simple Pairing and Secure Connections pairing in the Bluetooth protocol could allow an unauthenticated user to complete authentication without pairing credentials. A physically proximate attacker placed between two Bluetooth devices could use this to subsequently impersonate one of the paired devices. (CVE-2023-24023) shanzhulig discovered that the DRM subsystem in the Linux kernel contained a race condition when performing certain operation whilehandling driver unload, 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-2023-51043) It was discovered that a race condition existed in the Bluetooth subsystem of 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-2023-51779) It was discovered that the device mapper driver in the Linux kernel did not properly validate target size during certain memory allocations. A local attacker could use this to cause a denial of service (system crash). (CVE-2023-52429, CVE-2024-23851) Several security issues were discovered in the Linux kernel. An attacker could possibly use these to compromise the system. This update corrects flaws in the following subsystems: - Architecture specifics; - ACPI drivers; - I2C subsystem; - Media drivers; - JFS file system; - IPv4 Networking; - Open vSwitch; (CVE-2021-46966, CVE-2021-46936, CVE-2023-52451, CVE-2019-25162, CVE-2023-52445, CVE-2023-52600, CVE-2021-46990, CVE-2021-46955, CVE-2023-52603) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 16.04 LTS (Available with Ubuntu Pro): linux-image-4.4.0-1131-kvm 4.4.0-1131.141 linux-image-4.4.0-1168-aws 4.4.0-1168.183 linux-image-4.4.0-253-generic 4.4.0-253.287 linux-image-4.4.0-253-lowlatency 4.4.0-253.287 linux-image-aws 4.4.0.1168.172 linux-image-generic 4.4.0.253.259 linux-image-generic-lts-xenial 4.4.0.253.259 linux-image-kvm 4.4.0.1131.128 linux-image-lowlatency 4.4.0.253.259 linux-image-lowlatency-lts-xenial 4.4.0.253.259 linux-image-virtual 4.4.0.253.259 linux-image-virtual-lts-xenial 4.4.0.253.259 Ubuntu 14.04 LTS (Available with Ubuntu Pro): linux-image-4.4.0-1130-aws 4.4.0-1130.136 linux-image-4.4.0-253-generic 4.4.0-253.287~14.04.1 linux-image-4.4.0-253-lowlatency 4.4.0-253.287~14.04.1 linux-image-aws 4.4.0.1130.127 linux-image-generic-lts-xenial 4.4.0.253.287~14.04.1 linux-image-lowlatency-lts-xenial 4.4.0.253.287~14.04.1 linux-image-virtual-lts-xenial 4.4.0.253.287~14.04.1 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-6739-1 CVE-2019-25162, CVE-2021-46936, CVE-2021-46955, CVE-2021-46966, CVE-2021-46990, CVE-2022-20422, CVE-2023-1382, CVE-2023-1998, CVE-2023-24023, CVE-2023-51043, CVE-2023-51779, CVE-2023-52429, CVE-2023-52445, CVE-2023-52451, CVE-2023-52600, CVE-2023-52603, CVE-2024-23851 . The Ubuntu Linux kernel contains significant vulnerabilities that necessitate prompt updates, as they pose risks of denial-of-service (DoS) attacks and potential data exposure.. Ubuntu Kernel Flaw, Linux Security Update, Kernel Mitigation, System Vulnerabilities. . Severity: Critical. LinuxSecurity.com Team

Apr 19, 2024 •Critical Ubuntu