========================================================================== Ubuntu Security Notice USN-5591-3 September 01, 2022
linux, linux-azure-4.15, linux-dell300x, linux-gcp-4.15, linux-kvm, linux-snapdragon vulnerability ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary: The system could be made to crash or run programs as an administrator. Software Description: - linux: Linux kernel - linux-azure-4.15: Linux kernel for Microsoft Azure Cloud systems - linux-dell300x: Linux kernel for Dell 300x platforms - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors Details:It was discovered that the virtual terminal driver in the Linux kernel did not properly handle VGA console font changes, leading to an out-of-bounds write. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code.
Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1052-dell300x 4.15.0-1052.57 linux-image-4.15.0-1126-kvm 4.15.0-1126.131 linux-image-4.15.0-1135-gcp 4.15.0-1135.151 linux-image-4.15.0-1136-snapdragon 4.15.0-1136.146 linux-image-4.15.0-1150-azure 4.15.0-1150.165 linux-image-4.15.0-192-generic 4.15.0-192.203 linux-image-4.15.0-192-generic-lpae 4.15.0-192.203 linux-image-4.15.0-192-lowlatency 4.15.0-192.203 linux-image-azure-lts-18.04 4.15.0.1150.120 linux-image-dell300x 4.15.0.1052.52 linux-image-gcp-lts-18.04 4.15.0.1135.151 linux-image-generic 4.15.0.192.177 linux-image-generic-lpae 4.15.0.192.177 linux-image-kvm 4.15.0.1126.119 linux-image-lowlatency 4.15.0.192.177 linux-image-snapdragon 4.15.0.1136.137 linux-image-virtual 4.15.0.192.177 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-5591-3 https://ubuntu.com/security/notices/USN-5591-1 CVE-2021-33656 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-192.203 https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1150.165 https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1052.57 https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1135.151 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1126.131 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1136.146
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