[USN-5017-1] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-5017-1 July 20, 2021
linux, linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gcp, linux-gcp-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, linux-hwe-5.4, linux-kvm, linux-oracle, linux-oracle-5.4, linux-raspi, linux-raspi-5.4 vulnerabilities ==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 20.04 LTS – Ubuntu 18.04 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-gke: Linux kernel for Google Container Engine (GKE) systems – linux-gkeop: Linux kernel for Google Container Engine (GKE) 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-5.4: 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-gke-5.4: Linux kernel for Google Container Engine (GKE) systems – linux-gkeop-5.4: Linux kernel for Google Container Engine (GKE) systems – linux-hwe-5.4: Linux hardware enablement (HWE) kernel – linux-oracle-5.4: Linux kernel for Oracle Cloud systems – linux-raspi-5.4: Linux kernel for Raspberry Pi (V8) 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)
It was discovered that the bluetooth subsystem in the Linux kernel did not properly perform access control. An authenticated attacker could possibly use this to expose sensitive information. (CVE-2020-26558, CVE-2021-0129)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: linux-image-5.4.0-1021-gkeop 5.4.0-1021.22 linux-image-5.4.0-1041-raspi 5.4.0-1041.45 linux-image-5.4.0-1044-kvm 5.4.0-1044.46 linux-image-5.4.0-1049-gcp 5.4.0-1049.53 linux-image-5.4.0-1049-gke 5.4.0-1049.52 linux-image-5.4.0-1052-oracle 5.4.0-1052.56 linux-image-5.4.0-1054-aws 5.4.0-1054.57 linux-image-5.4.0-1055-azure 5.4.0-1055.57 linux-image-5.4.0-80-generic 5.4.0-80.90 linux-image-5.4.0-80-generic-lpae 5.4.0-80.90 linux-image-5.4.0-80-lowlatency 5.4.0-80.90 linux-image-aws-lts-20.04 5.4.0.1054.57 linux-image-azure-lts-20.04 5.4.0.1055.53 linux-image-gcp-lts-20.04 5.4.0.1049.59 linux-image-generic 5.4.0.80.84 linux-image-generic-lpae 5.4.0.80.84 linux-image-gke 5.4.0.1049.59 linux-image-gke-5.4 5.4.0.1049.59 linux-image-gkeop 5.4.0.1021.24 linux-image-gkeop-5.4 5.4.0.1021.24 linux-image-kvm 5.4.0.1044.43 linux-image-lowlatency 5.4.0.80.84 linux-image-oem 5.4.0.80.84 linux-image-oem-osp1 5.4.0.80.84 linux-image-oracle-lts-20.04 5.4.0.1052.52 linux-image-raspi 5.4.0.1041.76 linux-image-raspi2 5.4.0.1041.76 linux-image-virtual 5.4.0.80.84
Ubuntu 18.04 LTS: linux-image-5.4.0-1021-gkeop 5.4.0-1021.22~18.04.1 linux-image-5.4.0-1041-raspi 5.4.0-1041.45~18.04.1 linux-image-5.4.0-1049-gcp 5.4.0-1049.53~18.04.1 linux-image-5.4.0-1049-gke 5.4.0-1049.52~18.04.1 linux-image-5.4.0-1052-oracle 5.4.0-1052.56~18.04.1 linux-image-5.4.0-1054-aws 5.4.0-1054.57~18.04.1 linux-image-5.4.0-1055-azure 5.4.0-1055.57~18.04.1 linux-image-5.4.0-80-generic 5.4.0-80.90~18.04.1 linux-image-5.4.0-80-generic-lpae 5.4.0-80.90~18.04.1 linux-image-5.4.0-80-lowlatency 5.4.0-80.90~18.04.1 linux-image-aws 5.4.0.1054.37 linux-image-azure 5.4.0.1055.35 linux-image-gcp 5.4.0.1049.36 linux-image-generic-hwe-18.04 5.4.0.80.90~18.04.72 linux-image-generic-lpae-hwe-18.04 5.4.0.80.90~18.04.72 linux-image-gke-5.4 5.4.0.1049.52~18.04.15 linux-image-gkeop-5.4 5.4.0.1021.22~18.04.22 linux-image-lowlatency-hwe-18.04 5.4.0.80.90~18.04.72 linux-image-oem 5.4.0.80.90~18.04.72 linux-image-oem-osp1 5.4.0.80.90~18.04.72 linux-image-oracle 5.4.0.1052.56~18.04.32 linux-image-raspi-hwe-18.04 5.4.0.1041.44 linux-image-snapdragon-hwe-18.04 5.4.0.80.90~18.04.72 linux-image-virtual-hwe-18.04 5.4.0.80.90~18.04.72
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-5017-1 CVE-2020-26558, CVE-2021-0129, CVE-2021-33909
Package Information: launchpad.net/ubuntu/+source/linux/5.4.0-80.90 launchpad.net/ubuntu/+source/linux-aws/5.4.0-1054.57 launchpad.net/ubuntu/+source/linux-azure/5.4.0-1055.57 launchpad.net/ubuntu/+source/linux-gcp/5.4.0-1049.53 launchpad.net/ubuntu/+source/linux-gke/5.4.0-1049.52 launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1021.22 launchpad.net/ubuntu/+source/linux-kvm/5.4.0-1044.46 launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1052.56 launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1041.45 launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1054.57~18.04.1 launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1055.57~18.04.1 launchpad.net/ubuntu/+source/linux-gcp-5.4/5.4.0-1049.53~18.04.1 launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1049.52~18.04.1 launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1021.22~18.04.1 launchpad.net/ubuntu/+source/linux-hwe-5.4/5.4.0-80.90~18.04.1 launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1052.56~18.04.1 launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1041.45~18.04.1