Ubuntu Security Notice 5114-1 - 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. 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. Various other issues were also addressed.
ceee63f51059c725b70a515fe8119b33ddc4422809941ce8a057f099681ff444
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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
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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