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Ubuntu Security Notice USN-5621-1

Ubuntu Security Notice 5621-1 - It was discovered that the framebuffer driver on the Linux kernel did not verify size limits when changing font or screen size, leading to an out-of- bounds write. A local attacker could use this to cause a denial of service or possibly execute arbitrary code. Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter subsystem in the Linux kernel did not properly handle rules that truncated packets below the packet header size. When such rules are in place, a remote attacker could possibly use this to cause a denial of service.

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=========================================================================Ubuntu Security Notice USN-5621-1September 21, 2022linux, linux-aws, linux-aws-hwe, linux-azure-4.15, linux-dell300x,linux-gcp, linux-gcp-4.15, lnux-hwe, inux-kvm, linux-oracle, linux-raspi2,linux-snapdragon vulnerabilities=========================================================================A security issue affects these releases of Ubuntu and its derivatives:- Ubuntu 18.04 LTS- Ubuntu 16.04 ESMSummary: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-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-oracle: Linux kernel for Oracle Cloud systems- linux-raspi2: Linux kernel for Raspberry Pi systems- linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors- linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems- linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems- linux-hwe: Linux hardware enablement (HWE) kernelDetails:It was discovered that the framebuffer driver on the Linux kernel did notverify size limits when changing font or screen size, 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. (CVE-2021-33655)Domingo Dirutigliano and Nicola Guerrera discovered that the netfiltersubsystem in the Linux kernel did not properly handle rules that truncatedpackets below the packet header size. When such rules are in place, aremote attacker could possibly use this to cause a denial of service(system crash). (CVE-2022-36946)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 18.04 LTS:  linux-image-4.15.0-1053-dell300x  4.15.0-1053.58  linux-image-4.15.0-1106-oracle  4.15.0-1106.117  linux-image-4.15.0-1119-raspi2  4.15.0-1119.127  linux-image-4.15.0-1127-kvm     4.15.0-1127.132  linux-image-4.15.0-1136-gcp     4.15.0-1136.152  linux-image-4.15.0-1137-snapdragon  4.15.0-1137.147  linux-image-4.15.0-1141-aws     4.15.0-1141.152  linux-image-4.15.0-1151-azure   4.15.0-1151.166  linux-image-4.15.0-193-generic  4.15.0-193.204  linux-image-4.15.0-193-generic-lpae  4.15.0-193.204  linux-image-4.15.0-193-lowlatency  4.15.0-193.204  linux-image-aws-lts-18.04       4.15.0.1141.141  linux-image-azure-lts-18.04     4.15.0.1151.121  linux-image-dell300x            4.15.0.1053.53  linux-image-gcp-lts-18.04       4.15.0.1136.152  linux-image-generic             4.15.0.193.178  linux-image-generic-lpae        4.15.0.193.178  linux-image-kvm                 4.15.0.1127.120  linux-image-lowlatency          4.15.0.193.178  linux-image-oracle-lts-18.04    4.15.0.1106.113  linux-image-raspi2              4.15.0.1119.116  linux-image-snapdragon          4.15.0.1137.138  linux-image-virtual             4.15.0.193.178Ubuntu 16.04 ESM:  linux-image-4.15.0-1106-oracle  4.15.0-1106.117~16.04.1  linux-image-4.15.0-1136-gcp     4.15.0-1136.152~16.04.1  linux-image-4.15.0-1141-aws-hwe  4.15.0-1141.152~16.04.1  linux-image-4.15.0-193-generic  4.15.0-193.204~16.04.1  linux-image-4.15.0-193-lowlatency  4.15.0-193.204~16.04.1  linux-image-aws-hwe             4.15.0.1141.128  linux-image-gcp                 4.15.0.1136.130  linux-image-generic-hwe-16.04   4.15.0.193.180  linux-image-gke                 4.15.0.1136.130  linux-image-lowlatency-hwe-16.04  4.15.0.193.180  linux-image-oem                 4.15.0.193.180  linux-image-oracle              4.15.0.1106.90  linux-image-virtual-hwe-16.04   4.15.0.193.180After 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-5621-1  CVE-2021-33655, CVE-2022-36946Package Information:  https://launchpad.net/ubuntu/+source/linux/4.15.0-193.204  https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1141.152  https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1151.166  https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1053.58  https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1136.152  https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1127.132  https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1106.117  https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1119.127  https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1137.147

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