========================================================================== Ubuntu Security Notice USN-6317-1 August 29, 2023 linux, linux-aws, linux-aws-5.4, linux-gcp, linux-hwe-5.4, linux-kvm, linux-oracle, linux-xilinx-zynqmp vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 20.04 LTS - Ubuntu 18.04 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-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-kvm: Linux kernel for cloud environments - linux-oracle: Linux kernel for Oracle Cloud systems - linux-xilinx-zynqmp: Linux kernel for Xilinx ZynqMP processors - linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems - linux-hwe-5.4: Linux hardware enablement (HWE) kernel Details: Daniel Moghimi discovered that some Intel(R) Processors did not properly clear microarchitectural state after speculative execution of various instructions. A local unprivileged user could use this to obtain to sensitive information. (CVE-2022-40982) Tavis Ormandy discovered that some AMD processors did not properly handle speculative execution of certain vector register instructions. A local attacker could use this to expose sensitive information. (CVE-2023-20593) It was discovered that the universal 32bit network packet classifier implementation in the Linux kernel did not properly perform reference counting in some situations, 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-2023-3609) It was discovered that the Quick Fair Queueing network scheduler implementation in the Linux kernel contained an out-of-bounds write vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-3611) It was discovered that the network packet classifier with netfilter/firewall marks implementation in the Linux kernel did not properly handle reference counting, 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-2023-3776) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 20.04 LTS: linux-image-5.4.0-1028-xilinx-zynqmp 5.4.0-1028.32 linux-image-5.4.0-1097-kvm 5.4.0-1097.103 linux-image-5.4.0-1107-oracle 5.4.0-1107.116 linux-image-5.4.0-1108-aws 5.4.0-1108.116 linux-image-5.4.0-1111-gcp 5.4.0-1111.120 linux-image-5.4.0-159-generic 5.4.0-159.176 linux-image-5.4.0-159-generic-lpae 5.4.0-159.176 linux-image-5.4.0-159-lowlatency 5.4.0-159.176 linux-image-aws-lts-20.04 5.4.0.1108.105 linux-image-gcp-lts-20.04 5.4.0.1111.113 linux-image-generic 5.4.0.159.154 linux-image-generic-lpae 5.4.0.159.154 linux-image-kvm 5.4.0.1097.92 linux-image-lowlatency 5.4.0.159.154 linux-image-oem 5.4.0.159.154 linux-image-oem-osp1 5.4.0.159.154 linux-image-oracle-lts-20.04 5.4.0.1107.100 linux-image-virtual 5.4.0.159.154 linux-image-xilinx-zynqmp 5.4.0.1028.30 Ubuntu 18.04 LTS (Available with Ubuntu Pro): linux-image-5.4.0-1108-aws 5.4.0-1108.116~18.04.1 linux-image-5.4.0-159-generic 5.4.0-159.176~18.04.1 linux-image-5.4.0-159-generic-lpae 5.4.0-159.176~18.04.1 linux-image-5.4.0-159-lowlatency 5.4.0-159.176~18.04.1 linux-image-aws 5.4.0.1108.86 linux-image-generic-hwe-18.04 5.4.0.159.176~18.04.127 linux-image-generic-lpae-hwe-18.04 5.4.0.159.176~18.04.127 linux-image-lowlatency-hwe-18.04 5.4.0.159.176~18.04.127 linux-image-oem 5.4.0.159.176~18.04.127 linux-image-oem-osp1 5.4.0.159.176~18.04.127 linux-image-snapdragon-hwe-18.04 5.4.0.159.176~18.04.127 linux-image-virtual-hwe-18.04 5.4.0.159.176~18.04.127 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-6317-1 CVE-2022-40982, CVE-2023-20593, CVE-2023-3609, CVE-2023-3611, CVE-2023-3776 Package Information: https://launchpad.net/ubuntu/+source/linux/5.4.0-159.176 https://launchpad.net/ubuntu/+source/linux-aws/5.4.0-1108.116 https://launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1111.120 https://launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1097.103 https://launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1107.116 https://launchpad.net/ubuntu/+source/linux-xilinx-zynqmp/5.4.0-1028.32