1. Ubuntu Security Notices
  2. USN-5114-1

USN-5114-1: Linux kernel vulnerabilities

Publication date

22 October 2021

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

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...

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

After a standard system update you need to reboot your computer to make all the necessary changes.

Learn more about how to get the fixes.

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.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
18.04 bionic linux-image-4.15.0-1029-dell300x –  4.15.0-1029.34
linux-image-4.15.0-1082-oracle –  4.15.0-1082.90
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-oracle-lts-18.04 –  4.15.0.1082.92
linux-image-raspi2 –  4.15.0.1097.95
linux-image-snapdragon –  4.15.0.1114.117
linux-image-virtual –  4.15.0.161.150
16.04 xenial linux-image-4.15.0-1082-oracle –  4.15.0-1082.90~16.04.1  
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-oracle –  4.15.0.1082.70  
linux-image-virtual-hwe-16.04 –  4.15.0.161.154  
14.04 trusty linux-image-4.15.0-1125-azure –  4.15.0-1125.138~14.04.1  
linux-image-azure –  4.15.0.1125.98  

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References

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