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Ubuntu Security Notice USN-5977-1
Ubuntu Security Notice 5977-1 - It was discovered that the network queuing discipline implementation in the Linux kernel contained a use-after-free vulnerability. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. It was discovered that the KVM VMX implementation in the Linux kernel did not properly handle indirect branch prediction isolation between L1 and L2 VMs. An attacker in a guest VM could use this to expose sensitive information from the host OS or other guest VMs.
==========================================================================Ubuntu Security Notice USN-5977-1March 27, 2023linux-oem-6.0 vulnerabilities==========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 22.04 LTSSummary:Several security issues were fixed in the Linux kernel.Software Description:- linux-oem-6.0: Linux kernel for OEM systemsDetails:It was discovered that the network queuing discipline implementation in theLinux kernel contained a use-after-free vulnerability. A local attackercould use this to cause a denial of service (system crash) or possiblyexecute arbitrary code. (CVE-2023-1281)It was discovered that the KVM VMX implementation in the Linux kernel didnot properly handle indirect branch prediction isolation between L1 and L2VMs. An attacker in a guest VM could use this to expose sensitiveinformation from the host OS or other guest VMs. (CVE-2022-2196)Thadeu Cascardo discovered that the io_uring subsystem contained a double-free vulnerability in certain memory allocation error conditions. A localattacker could possibly use this to cause a denial of service (systemcrash). (CVE-2023-1032)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 22.04 LTS: linux-image-6.0.0-1013-oem 6.0.0-1013.13 linux-image-oem-22.04b 6.0.0.1013.13After a standard system update you need to reboot your computer to makeall the necessary changes.ATTENTION: Due to an unavoidable ABI change the kernel updates havebeen given a new version number, which requires you to recompile andreinstall 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 performthis as well.References: https://ubuntu.com/security/notices/USN-5977-1 CVE-2022-2196, CVE-2023-1032, CVE-2023-1281Package Information: https://launchpad.net/ubuntu/+source/linux-oem-6.0/6.0.0-1013.13
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