========================================================================== Ubuntu Security Notice USN-4660-1 December 03, 2020 linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15, linux-gcp, linux-gcp-4.15, linux-gke-4.15, linux-hwe, linux-kvm, linux-oem, 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 LTS - Ubuntu 14.04 ESM 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-azure-4.15: Linux kernel for Microsoft Azure Cloud systems - linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems - linux-gke-4.15: Linux kernel for Google Container Engine (GKE) systems - linux-kvm: Linux kernel for cloud environments - linux-oem: Linux kernel for OEM systems - linux-oracle: Linux kernel for Oracle Cloud systems - linux-raspi2: Linux kernel for Raspberry Pi (V8) systems - linux-snapdragon: Linux kernel for Qualcomm Snapdragon processors - linux-aws-hwe: Linux kernel for Amazon Web Services (AWS-HWE) systems - linux-azure: Linux kernel for Microsoft Azure Cloud systems - linux-gcp: Linux kernel for Google Cloud Platform (GCP) systems - linux-hwe: Linux hardware enablement (HWE) kernel Details: It was discovered that a race condition existed in the perf subsystem of the Linux kernel, leading to a use-after-free vulnerability. An attacker with access to the perf subsystem could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-14351) It was discovered that the frame buffer implementation in the Linux kernel did not properly handle some edge cases in software scrollback. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-14390) It was discovered that the netfilter connection tracker for netlink in the Linux kernel did not properly perform bounds checking in some situations. A local attacker could use this to cause a denial of service (system crash). (CVE-2020-25211) It was discovered that the Rados block device (rbd) driver in the Linux kernel did not properly perform privilege checks for access to rbd devices in some situations. A local attacker could use this to map or unmap rbd block devices. (CVE-2020-25284) It was discovered that a race condition existed in the hugetlb sysctl implementation in the Linux kernel. A privileged attacker could use this to cause a denial of service (system crash). (CVE-2020-25285) It was discovered that the block layer subsystem in the Linux kernel did not properly handle zero-length requests. A local attacker could use this to cause a denial of service. (CVE-2020-25641) It was discovered that the HDLC PPP implementation in the Linux kernel did not properly validate input in some situations. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2020-25643) It was discovered that the GENEVE tunnel implementation in the Linux kernel when combined with IPSec did not properly select IP routes in some situations. An attacker could use this to expose sensitive information (unencrypted network traffic). (CVE-2020-25645) It was discovered that the framebuffer implementation in the Linux kernel did not properly perform range checks in certain situations. A local attacker could use this to expose sensitive information (kernel memory). (CVE-2020-28915) It was discovered that Power 9 processors could be coerced to expose information from the L1 cache in certain situations. A local attacker could use this to expose sensitive information. (CVE-2020-4788) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS: linux-image-4.15.0-1059-oracle 4.15.0-1059.65 linux-image-4.15.0-1074-gke 4.15.0-1074.79 linux-image-4.15.0-1074-raspi2 4.15.0-1074.79 linux-image-4.15.0-1079-kvm 4.15.0-1079.81 linux-image-4.15.0-1088-aws 4.15.0-1088.93 linux-image-4.15.0-1088-gcp 4.15.0-1088.101 linux-image-4.15.0-1091-snapdragon 4.15.0-1091.100 linux-image-4.15.0-1100-azure 4.15.0-1100.111 linux-image-4.15.0-1103-oem 4.15.0-1103.114 linux-image-4.15.0-126-generic 4.15.0-126.129 linux-image-4.15.0-126-generic-lpae 4.15.0-126.129 linux-image-4.15.0-126-lowlatency 4.15.0-126.129 linux-image-aws-lts-18.04 4.15.0.1088.90 linux-image-azure-lts-18.04 4.15.0.1100.73 linux-image-gcp-lts-18.04 4.15.0.1088.106 linux-image-generic 4.15.0.126.113 linux-image-generic-lpae 4.15.0.126.113 linux-image-gke 4.15.0.1074.78 linux-image-gke-4.15 4.15.0.1074.78 linux-image-kvm 4.15.0.1079.75 linux-image-lowlatency 4.15.0.126.113 linux-image-oem 4.15.0.1103.107 linux-image-oracle-lts-18.04 4.15.0.1059.69 linux-image-powerpc-e500mc 4.15.0.126.113 linux-image-powerpc-smp 4.15.0.126.113 linux-image-powerpc64-emb 4.15.0.126.113 linux-image-powerpc64-smp 4.15.0.126.113 linux-image-raspi2 4.15.0.1074.71 linux-image-snapdragon 4.15.0.1091.94 linux-image-virtual 4.15.0.126.113 Ubuntu 16.04 LTS: linux-image-4.15.0-1059-oracle 4.15.0-1059.65~16.04.1 linux-image-4.15.0-1088-aws 4.15.0-1088.93~16.04.1 linux-image-4.15.0-1088-gcp 4.15.0-1088.101~16.04.1 linux-image-4.15.0-1100-azure 4.15.0-1100.111~16.04.1 linux-image-4.15.0-126-generic 4.15.0-126.129~16.04.1 linux-image-4.15.0-126-generic-lpae 4.15.0-126.129~16.04.1 linux-image-4.15.0-126-lowlatency 4.15.0-126.129~16.04.1 linux-image-aws-hwe 4.15.0.1088.82 linux-image-azure 4.15.0.1100.93 linux-image-azure-edge 4.15.0.1100.93 linux-image-gcp 4.15.0.1088.89 linux-image-generic-hwe-16.04 4.15.0.126.125 linux-image-generic-lpae-hwe-16.04 4.15.0.126.125 linux-image-gke 4.15.0.1088.89 linux-image-lowlatency-hwe-16.04 4.15.0.126.125 linux-image-oem 4.15.0.126.125 linux-image-oracle 4.15.0.1059.48 linux-image-virtual-hwe-16.04 4.15.0.126.125 Ubuntu 14.04 ESM: linux-image-4.15.0-1100-azure 4.15.0-1100.111~14.04.1 linux-image-azure 4.15.0.1100.75 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://usn.ubuntu.com/4660-1 CVE-2020-14351, CVE-2020-14390, CVE-2020-25211, CVE-2020-25284, CVE-2020-25285, CVE-2020-25641, CVE-2020-25643, CVE-2020-25645, CVE-2020-28915, CVE-2020-4788 Package Information: https://launchpad.net/ubuntu/+source/linux/4.15.0-126.129 https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1088.93 https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1100.111 https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1088.101 https://launchpad.net/ubuntu/+source/linux-gke-4.15/4.15.0-1074.79 https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1079.81 https://launchpad.net/ubuntu/+source/linux-oem/4.15.0-1103.114 https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1059.65 https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1074.79 https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1091.100 https://launchpad.net/ubuntu/+source/linux-aws-hwe/4.15.0-1088.93~16.04.1 https://launchpad.net/ubuntu/+source/linux-azure/4.15.0-1100.111~16.04.1 https://launchpad.net/ubuntu/+source/linux-gcp/4.15.0-1088.101~16.04.1 https://launchpad.net/ubuntu/+source/linux-hwe/4.15.0-126.129~16.04.1 https://launchpad.net/ubuntu/+source/linux-oracle/4.15.0-1059.65~16.04.1