[USN-5016-1] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-5016-1 July 20, 2021
linux, linux-aws, linux-aws-5.8, linux-azure, linux-azure-5.8, linux-gcp, linux-gcp-5.8, linux-hwe-5.8, linux-kvm, linux-oracle, linux-oracle-5.8, linux-raspi vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.10 – Ubuntu 20.04 LTS
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: Linux kernel for Microsoft Azure Cloud 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-raspi: Linux kernel for Raspberry Pi (V8) systems – linux-aws-5.8: Linux kernel for Amazon Web Services (AWS) systems – linux-azure-5.8: Linux kernel for Microsoft Azure cloud systems – linux-gcp-5.8: Linux kernel for Google Cloud Platform (GCP) systems – linux-hwe-5.8: Linux hardware enablement (HWE) kernel – linux-oracle-5.8: Linux kernel for Oracle Cloud systems
Details:
It was discovered that the virtual file system implementation in the Linux kernel contained an unsigned to signed integer conversion error. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-33909)
Or Cohen and Nadav Markus discovered a use-after-free vulnerability in the nfc implementation in the Linux kernel. A privileged local attacker could use this issue to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-23134)
It was discovered that a race condition in the kernel Bluetooth subsystem could lead to use-after-free of slab objects. An attacker could use this issue to possibly execute arbitrary code. (CVE-2021-32399)
It was discovered that a use-after-free existed in the Bluetooth HCI driver of the Linux kernel. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2021-33034)
It was discovered that an out-of-bounds (OOB) memory access flaw existed in the f2fs module of the Linux kernel. A local attacker could use this issue to cause a denial of service (system crash). (CVE-2021-3506)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.10: linux-image-5.8.0-1032-raspi 5.8.0-1032.35 linux-image-5.8.0-1032-raspi-nolpae 5.8.0-1032.35 linux-image-5.8.0-1033-kvm 5.8.0-1033.36 linux-image-5.8.0-1037-oracle 5.8.0-1037.38 linux-image-5.8.0-1038-gcp 5.8.0-1038.40 linux-image-5.8.0-1039-azure 5.8.0-1039.42 linux-image-5.8.0-1041-aws 5.8.0-1041.43 linux-image-5.8.0-63-generic 5.8.0-63.71 linux-image-5.8.0-63-generic-64k 5.8.0-63.71 linux-image-5.8.0-63-generic-lpae 5.8.0-63.71 linux-image-5.8.0-63-lowlatency 5.8.0-63.71 linux-image-aws 5.8.0.1041.43 linux-image-azure 5.8.0.1039.40 linux-image-gcp 5.8.0.1038.38 linux-image-generic 5.8.0.63.69 linux-image-generic-64k 5.8.0.63.69 linux-image-generic-lpae 5.8.0.63.69 linux-image-gke 5.8.0.1038.38 linux-image-kvm 5.8.0.1033.36 linux-image-lowlatency 5.8.0.63.69 linux-image-oem-20.04 5.8.0.63.69 linux-image-oracle 5.8.0.1037.36 linux-image-raspi 5.8.0.1032.34 linux-image-raspi-nolpae 5.8.0.1032.34 linux-image-virtual 5.8.0.63.69
Ubuntu 20.04 LTS: linux-image-5.8.0-1037-oracle 5.8.0-1037.38~20.04.1 linux-image-5.8.0-1038-gcp 5.8.0-1038.40~20.04.1 linux-image-5.8.0-1039-azure 5.8.0-1039.42~20.04.1 linux-image-5.8.0-1041-aws 5.8.0-1041.43~20.04.1 linux-image-5.8.0-63-generic 5.8.0-63.71~20.04.1 linux-image-5.8.0-63-generic-64k 5.8.0-63.71~20.04.1 linux-image-5.8.0-63-generic-lpae 5.8.0-63.71~20.04.1 linux-image-5.8.0-63-lowlatency 5.8.0-63.71~20.04.1 linux-image-aws 5.8.0.1041.43~20.04.13 linux-image-azure 5.8.0.1039.42~20.04.11 linux-image-gcp 5.8.0.1038.40~20.04.13 linux-image-generic-64k-hwe-20.04 5.8.0.63.71~20.04.45 linux-image-generic-hwe-20.04 5.8.0.63.71~20.04.45 linux-image-generic-lpae-hwe-20.04 5.8.0.63.71~20.04.45 linux-image-lowlatency-hwe-20.04 5.8.0.63.71~20.04.45 linux-image-oracle 5.8.0.1037.38~20.04.13 linux-image-virtual-hwe-20.04 5.8.0.63.71~20.04.45
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: ubuntu.com/security/notices/USN-5016-1 CVE-2021-23134, CVE-2021-32399, CVE-2021-33034, CVE-2021-33909, CVE-2021-3506
Package Information: launchpad.net/ubuntu/+source/linux/5.8.0-63.71 launchpad.net/ubuntu/+source/linux-aws/5.8.0-1041.43 launchpad.net/ubuntu/+source/linux-azure/5.8.0-1039.42 launchpad.net/ubuntu/+source/linux-gcp/5.8.0-1038.40 launchpad.net/ubuntu/+source/linux-kvm/5.8.0-1033.36 launchpad.net/ubuntu/+source/linux-oracle/5.8.0-1037.38 launchpad.net/ubuntu/+source/linux-raspi/5.8.0-1032.35 launchpad.net/ubuntu/+source/linux-aws-5.8/5.8.0-1041.43~20.04.1 launchpad.net/ubuntu/+source/linux-azure-5.8/5.8.0-1039.42~20.04.1 launchpad.net/ubuntu/+source/linux-gcp-5.8/5.8.0-1038.40~20.04.1 launchpad.net/ubuntu/+source/linux-hwe-5.8/5.8.0-63.71~20.04.1 launchpad.net/ubuntu/+source/linux-oracle-5.8/5.8.0-1037.38~20.04.1