1. Ubuntu Security Notices
  2. USN-5621-1

USN-5621-1: Linux kernel vulnerabilities

Publication date

21 September 2022

Overview

Several security issues were fixed in the Linux kernel.

Releases

Packages

Details

It was discovered that the framebuffer driver on the Linux kernel did not
verify size limits when changing font or screen size, leading to an out-of-
bounds write. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-33655)

Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter
subsystem in the Linux kernel did not properly handle rules that truncated
packets below the packet header size. When such rules are in place, a
remote attacker could possibly use this to cause a denial of service
(system crash). (CVE-2022-36946)

It was discovered that the framebuffer driver on the Linux kernel did not
verify size limits when changing font or screen size, leading to an out-of-
bounds write. A local attacker could use this to cause a denial of service
(system crash) or possibly execute arbitrary code. (CVE-2021-33655)

Domingo Dirutigliano and Nicola Guerrera discovered that the netfilter
subsystem in the Linux kernel did not properly handle rules that truncated
packets below the packet header size. When such rules are in place, a
remote attacker could possibly use this to cause a denial of service
(system crash). (CVE-2022-36946)

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-dell300x –  4.15.0.1053.53
linux-image-virtual –  4.15.0.193.178
linux-image-4.15.0-1136-gcp –  4.15.0-1136.152
linux-image-aws-lts-18.04 –  4.15.0.1141.141
linux-image-4.15.0-193-lowlatency –  4.15.0-193.204
linux-image-4.15.0-1119-raspi2 –  4.15.0-1119.127
linux-image-4.15.0-1137-snapdragon –  4.15.0-1137.147
linux-image-oracle-lts-18.04 –  4.15.0.1106.113
linux-image-raspi2 –  4.15.0.1119.116
linux-image-snapdragon –  4.15.0.1137.138
linux-image-4.15.0-1053-dell300x –  4.15.0-1053.58
linux-image-4.15.0-193-generic –  4.15.0-193.204
linux-image-azure-lts-18.04 –  4.15.0.1151.121
linux-image-kvm –  4.15.0.1127.120
linux-image-4.15.0-193-generic-lpae –  4.15.0-193.204
linux-image-4.15.0-1106-oracle –  4.15.0-1106.117
linux-image-gcp-lts-18.04 –  4.15.0.1136.152
linux-image-4.15.0-1141-aws –  4.15.0-1141.152
linux-image-4.15.0-1127-kvm –  4.15.0-1127.132
linux-image-generic –  4.15.0.193.178
linux-image-generic-lpae –  4.15.0.193.178
linux-image-4.15.0-1151-azure –  4.15.0-1151.166
linux-image-lowlatency –  4.15.0.193.178
16.04 xenial linux-image-lowlatency-hwe-16.04 –  4.15.0.193.180  
linux-image-4.15.0-193-generic –  4.15.0-193.204~16.04.1  
linux-image-4.15.0-1136-gcp –  4.15.0-1136.152~16.04.1  
linux-image-4.15.0-193-lowlatency –  4.15.0-193.204~16.04.1  
linux-image-oem –  4.15.0.193.180  
linux-image-4.15.0-1141-aws-hwe –  4.15.0-1141.152~16.04.1  
linux-image-gke –  4.15.0.1136.130  
linux-image-gcp –  4.15.0.1136.130  
linux-image-aws-hwe –  4.15.0.1141.128  
linux-image-generic-hwe-16.04 –  4.15.0.193.180  
linux-image-4.15.0-1106-oracle –  4.15.0-1106.117~16.04.1  
linux-image-oracle –  4.15.0.1106.90  
linux-image-virtual-hwe-16.04 –  4.15.0.193.180  

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References

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