Several security issues were fixed in the Linux kernel.. ========================================================================== Ubuntu Security Notice USN-6533-1 December 05, 2023 linux-oem-6.1 vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-oem-6.1: Linux kernel for OEM systems Details: Tom Dohrmann discovered that the Secure Encrypted Virtualization (SEV) implementation for AMD processors in the Linux kernel contained a race condition when accessing MMIO registers. A local attacker in a SEV guest VM could possibly use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-46813) It was discovered that the io_uring subsystem in the Linux kernel contained a race condition, leading to a null pointer dereference vulnerability. A local attacker could use this to cause a denial of service (system crash). (CVE-2023-46862) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS: linux-image-6.1.0-1027-oem 6.1.0-1027.27 linux-image-oem-22.04 6.1.0.1027.28 linux-image-oem-22.04a 6.1.0.1027.28 linux-image-oem-22.04b 6.1.0.1027.28 linux-image-oem-22.04c 6.1.0.1027.28 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 thisas well. References: https://ubuntu.com/security/notices/USN-6533-1 CVE-2023-46813, CVE-2023-46862 Package Information: https://launchpad.net/ubuntu/+source/linux-oem-6.1/6.1.0-1027.27 . Ubuntu 22.04 LTS has addressed multiple security flaws in its OEM Linux kernel. Ensure your system remains secure by keeping it updated.. Linux Kernel Security, Ubuntu Kernel Update, OEM Security Issues. . Severity: Critical. LinuxSecurity.com Team
The system could be made to crash or expose sensitive information under certain conditions.. =========================================================================Ubuntu Security Notice USN-4683-1 January 07, 2021 linux-oem-5.6 vulnerability ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS Summary: The system could be made to crash or expose sensitive information under certain conditions. Software Description: - linux-oem-5.6: Linux kernel for OEM systems Details: 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). Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.6.0-1039-oem 5.6.0-1039.43 linux-image-oem-20.04 5.6.0.1039.37 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-4683-1 CVE-2020-28974 Package Information: https://launchpad.net/ubuntu/+source/linux-oem-5.6/5.6.0-1039.43 . Ubuntu Security Notice USN-4683-1 details a kernel vulnerability that could lead to service interruption or potential data leakage.. Ubuntu Kernel Security, Denial of Service, Linux OEM Issues. . Severity: Critical. LinuxSecurity.com Team
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