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Ubuntu 18.04 LTS USN-5985-1 Critical: Kernel Denial Of Service Risks

Several security issues were fixed in the Linux kernel.. =========================================================================Ubuntu Security Notice USN-5985-1 March 29, 2023 linux-aws-5.4, linux-azure-5.4, linux-gcp-5.4, linux-hwe-5.4, linux-ibm-5.4, linux-oracle-5.4, linux-raspi-5.4 vulnerabilities ========================================================================= A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS Summary: Several security issues were fixed in the Linux kernel. Software Description: - linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems - linux-azure-5.4: Linux kernel for Microsoft Azure cloud systems - linux-gcp-5.4: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe-5.4: Linux hardware enablement (HWE) kernel - linux-ibm-5.4: Linux kernel for IBM cloud systems - linux-oracle-5.4: Linux kernel for Oracle Cloud systems - linux-raspi-5.4: Linux kernel for Raspberry Pi systems Details: It was discovered that the System V IPC implementation in the Linux kernel did not properly handle large shared memory counts. A local attacker could use this to cause a denial of service (memory exhaustion). (CVE-2021-3669) 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. (CVE-2022-2196) Gerald Lee discovered that the USB Gadget file system implementation in the Linux kernel contained a race condition, leading to a use-after-free vulnerability in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-4382) It was discovered that the RNDIS USB driver in the Linux kernel contained an integer overflow vulnerability. A local attacker with physical access could plug in a malicious USB device tocause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2023-23559) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-5.4.0-1046-ibm 5.4.0-1046.51~18.04.1 linux-image-5.4.0-1082-raspi 5.4.0-1082.93~18.04.1 linux-image-5.4.0-1098-oracle 5.4.0-1098.107~18.04.1 linux-image-5.4.0-1099-aws 5.4.0-1099.107~18.04.1 linux-image-5.4.0-1102-gcp 5.4.0-1102.111~18.04.2 linux-image-5.4.0-1105-azure 5.4.0-1105.111~18.04.1 linux-image-5.4.0-146-generic 5.4.0-146.163~18.04.1 linux-image-5.4.0-146-generic-lpae 5.4.0-146.163~18.04.1 linux-image-5.4.0-146-lowlatency 5.4.0-146.163~18.04.1 linux-image-aws 5.4.0.1099.77 linux-image-azure 5.4.0.1105.78 linux-image-gcp 5.4.0.1102.78 linux-image-generic-hwe-18.04 5.4.0.146.163~18.04.117 linux-image-generic-lpae-hwe-18.04 5.4.0.146.163~18.04.117 linux-image-ibm 5.4.0.1046.57 linux-image-lowlatency-hwe-18.04 5.4.0.146.163~18.04.117 linux-image-oem 5.4.0.146.163~18.04.117 linux-image-oem-osp1 5.4.0.146.163~18.04.117 linux-image-oracle 5.4.0.1098.107~18.04.70 linux-image-raspi-hwe-18.04 5.4.0.1082.79 linux-image-snapdragon-hwe-18.04 5.4.0.146.163~18.04.117 linux-image-virtual-hwe-18.04 5.4.0.146.163~18.04.117 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-5985-1 CVE-2021-3669, CVE-2022-2196, CVE-2022-4382, CVE-2023-23559 Package Information: https://launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1099.107~18.04.1 https://launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1105.111~18.04.1 https://launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1102.111~18.04.2 https://launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-146.163~18.04.1 https://launchpad.net/ubuntu/+source/linux-ibm-5.4/5.4.0-1046.51~18.04.1 https://launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1098.107~18.04.1 https://launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1082.93~18.04.1 . Several vulnerabilities within the Linux kernel on Ubuntu have been addressed through updates and patches, aiming to improve overall system robustness.. Ubuntu Kernel Issues, Cloud Security, Linux System Update. . Severity: Critical. LinuxSecurity.com Team

Mar 29, 2023 •Critical Ubuntu