[USN-5116-2] Linux kernel vulnerabilities

========================================================================== Ubuntu Security Notice USN-5116-2 October 22, 2021
linux-aws, linux-aws-5.4, linux-azure, linux-azure-5.4, linux-gke, linux-gke-5.4, linux-gkeop, linux-gkeop-5.4, 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-aws: Linux kernel for Amazon Web Services (AWS) systems – linux-azure: Linux kernel for Microsoft Azure Cloud systems – linux-gke: Linux kernel for Google Container Engine (GKE) systems – linux-gkeop: Linux kernel for Google Container Engine (GKE) systems – linux-oracle: Linux kernel for Oracle Cloud systems – linux-raspi: Linux kernel for Raspberry Pi systems – linux-aws-5.4: Linux kernel for Amazon Web Services (AWS) systems – linux-azure-5.4: Linux kernel version specific cloud tools for version 5.4.0-1062 – 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-oracle-5.4: Linux kernel for Oracle Cloud systems – linux-raspi-5.4: Linux kernel for Raspberry Pi systems
Details:
It was discovered that a race condition existed in the Atheros Ath9k WiFi driver in the Linux kernel. An attacker could possibly use this to expose sensitive information (WiFi network traffic). (CVE-2020-3702)
Alois Wohlschlager discovered that the overlay file system in the Linux kernel did not restrict private clones in some situations. An attacker could use this to expose sensitive information. (CVE-2021-3732)
It was discovered that the KVM hypervisor implementation in the Linux kernel did not properly compute the access permissions for shadow pages in some situations. A local attacker could use this to cause a denial of service. (CVE-2021-38198)
It was discovered that the Xilinx 10/100 Ethernet Lite device driver in the Linux kernel could report pointer addresses in some situations. An attacker could use this information to ease the exploitation of another vulnerability. (CVE-2021-38205)
It was discovered that the ext4 file system in the Linux kernel contained a race condition when writing xattrs to an inode. A local attacker could use this to cause a denial of service or possibly gain administrative privileges. (CVE-2021-40490)
It was discovered that the 6pack network protocol driver in the Linux kernel did not properly perform validation checks. A privileged attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2021-42008)
Update instructions:
The problem can be corrected by updating your system to the following package versions:
Ubuntu 20.04 LTS: linux-image-5.4.0-1025-gkeop 5.4.0-1025.26 linux-image-5.4.0-1045-raspi 5.4.0-1045.49 linux-image-5.4.0-1054-gke 5.4.0-1054.57 linux-image-5.4.0-1056-oracle 5.4.0-1056.60 linux-image-5.4.0-1058-aws 5.4.0-1058.61 linux-image-5.4.0-1062-azure 5.4.0-1062.65 linux-image-aws-lts-20.04 5.4.0.1058.61 linux-image-azure-lts-20.04 5.4.0.1062.60 linux-image-gke 5.4.0.1054.64 linux-image-gke-5.4 5.4.0.1054.64 linux-image-gkeop 5.4.0.1025.28 linux-image-gkeop-5.4 5.4.0.1025.28 linux-image-oracle-lts-20.04 5.4.0.1056.56 linux-image-raspi 5.4.0.1045.80 linux-image-raspi2 5.4.0.1045.80
Ubuntu 18.04 LTS: linux-image-5.4.0-1025-gkeop 5.4.0-1025.26~18.04.1 linux-image-5.4.0-1045-raspi 5.4.0-1045.49~18.04.1 linux-image-5.4.0-1054-gke 5.4.0-1054.57~18.04.1 linux-image-5.4.0-1056-oracle 5.4.0-1056.60~18.04.1 linux-image-5.4.0-1058-aws 5.4.0-1058.61~18.04.3 linux-image-5.4.0-1062-azure 5.4.0-1062.65~18.04.1 linux-image-aws 5.4.0.1058.41 linux-image-azure 5.4.0.1062.42 linux-image-gke-5.4 5.4.0.1054.57~18.04.19 linux-image-gkeop-5.4 5.4.0.1025.26~18.04.26 linux-image-oracle 5.4.0.1056.60~18.04.36 linux-image-raspi-hwe-18.04 5.4.0.1045.48
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-5116-2 ubuntu.com/security/notices/USN-5116-1 CVE-2020-3702, CVE-2021-3732, CVE-2021-38198, CVE-2021-38205, CVE-2021-40490, CVE-2021-42008
Package Information: launchpad.net/ubuntu/+source/linux-aws/5.4.0-1058.61 launchpad.net/ubuntu/+source/linux-azure/5.4.0-1062.65 launchpad.net/ubuntu/+source/linux-gke/5.4.0-1054.57 launchpad.net/ubuntu/+source/linux-gkeop/5.4.0-1025.26 launchpad.net/ubuntu/+source/linux-oracle/5.4.0-1056.60 launchpad.net/ubuntu/+source/linux-raspi/5.4.0-1045.49 launchpad.net/ubuntu/+source/linux-aws-5.4/5.4.0-1058.61~18.04.3 launchpad.net/ubuntu/+source/linux-azure-5.4/5.4.0-1062.65~18.04.1 launchpad.net/ubuntu/+source/linux-gke-5.4/5.4.0-1054.57~18.04.1 launchpad.net/ubuntu/+source/linux-gkeop-5.4/5.4.0-1025.26~18.04.1 launchpad.net/ubuntu/+source/linux-oracle-5.4/5.4.0-1056.60~18.04.1 launchpad.net/ubuntu/+source/linux-raspi-5.4/5.4.0-1045.49~18.04.1