USN-5114-1: Linux kernel vulnerabilities
=========================================================================
Ubuntu Security Notice USN-5114-1
October 20, 2021
linux, linux-aws, linux-aws-hwe, linux-azure, linux-azure-4.15,
linux-dell300x, linux-gcp, linux-gcp-4.15, linux-hwe, linux-kvm,
linux-raspi2, linux-snapdragon vulnerabilities
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- 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-dell300x: Linux kernel for Dell 300x platforms
- linux-gcp-4.15: Linux kernel for Google Cloud Platform (GCP) systems
- linux-kvm: Linux kernel for cloud environments
- linux-raspi2: Linux kernel for Raspberry Pi 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 Atheros Ath9k WiFi
driver in the Linux kernel. An attacker could possibly use this to expose
sensitive information (WiFi network traffic). (CVE-2020-3702)
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 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 18.04 LTS:
linux-image-4.15.0-1029-dell300x 4.15.0-1029.34
linux-image-4.15.0-1097-raspi2 4.15.0-1097.103
linux-image-4.15.0-1101-kvm 4.15.0-1101.103
linux-image-4.15.0-1110-gcp 4.15.0-1110.124
linux-image-4.15.0-1114-aws 4.15.0-1114.121
linux-image-4.15.0-1114-snapdragon 4.15.0-1114.123
linux-image-4.15.0-1125-azure 4.15.0-1125.138
linux-image-4.15.0-161-generic 4.15.0-161.169
linux-image-4.15.0-161-generic-lpae 4.15.0-161.169
linux-image-4.15.0-161-lowlatency 4.15.0-161.169
linux-image-aws-lts-18.04 4.15.0.1114.117
linux-image-azure-lts-18.04 4.15.0.1125.98
linux-image-dell300x 4.15.0.1029.31
linux-image-gcp-lts-18.04 4.15.0.1110.129
linux-image-generic 4.15.0.161.150
linux-image-generic-lpae 4.15.0.161.150
linux-image-kvm 4.15.0.1101.97
linux-image-lowlatency 4.15.0.161.150
linux-image-raspi2 4.15.0.1097.95
linux-image-snapdragon 4.15.0.1114.117
linux-image-virtual 4.15.0.161.150
Ubuntu 16.04 ESM:
linux-image-4.15.0-1110-gcp 4.15.0-1110.124~16.04.1
linux-image-4.15.0-1113-aws 4.15.0-1113.120~16.04.1
linux-image-4.15.0-1125-azure 4.15.0-1125.138~16.04.1
linux-image-4.15.0-161-generic 4.15.0-161.169~16.04.1
linux-image-4.15.0-161-lowlatency 4.15.0-161.169~16.04.1
linux-image-aws-hwe 4.15.0.1113.104
linux-image-azure 4.15.0.1125.116
linux-image-gcp 4.15.0.1110.111
linux-image-generic-hwe-16.04 4.15.0.161.154
linux-image-gke 4.15.0.1110.111
linux-image-lowlatency-hwe-16.04 4.15.0.161.154
linux-image-oem 4.15.0.161.154
linux-image-virtual-hwe-16.04 4.15.0.161.154
Ubuntu 14.04 ESM:
linux-image-4.15.0-1125-azure 4.15.0-1125.138~14.04.1
linux-image-azure 4.15.0.1125.98
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-5114-1
CVE-2020-3702, CVE-2021-38198, CVE-2021-40490, CVE-2021-42008
Package Information:
https://launchpad.net/ubuntu/+source/linux/4.15.0-161.169
https://launchpad.net/ubuntu/+source/linux-aws/4.15.0-1114.121
https://launchpad.net/ubuntu/+source/linux-azure-4.15/4.15.0-1125.138
https://launchpad.net/ubuntu/+source/linux-dell300x/4.15.0-1029.34
https://launchpad.net/ubuntu/+source/linux-gcp-4.15/4.15.0-1110.124
https://launchpad.net/ubuntu/+source/linux-kvm/4.15.0-1101.103
https://launchpad.net/ubuntu/+source/linux-raspi2/4.15.0-1097.103
https://launchpad.net/ubuntu/+source/linux-snapdragon/4.15.0-1114.123
A Linux kernel security update has been released for Ubuntu Linux 14.04 ESM, 16.04 ESM, and 18.04 LTS.
