A Linux kernel security update has been released for Ubuntu Linux 18.04 LTS, 20.04 LTS, and 22.04 LTS.

LSN-0091-1: Linux kernel vulnerability

Linux kernel vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 22.04 LTS

Summary

Several security issues were fixed in the kernel.

Software Description

- linux - Linux kernel
- linux-aws - Linux kernel for Amazon Web Services (AWS) systems - linux-azure - Linux kernel for Microsoft Azure Cloud systems - linux-gcp - Linux kernel for Google Cloud Platform (GCP) systems - linux-gke - Linux kernel for Google Container Engine (GKE) systems - linux-gkeop - Linux kernel for Google Container Engine (GKE) systems - linux-ibm - Linux kernel for IBM cloud systems

Details

It was discovered that a race condition existed in the memory address space accounting implementation in the Linux kernel, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-41222)

Sönke Huster discovered that a use-after-free vulnerability existed in the WiFi driver stack in the Linux kernel. A physically proximate attacker could use this to cause a denial of service (system crash) or possibly execute arbitrary code. (CVE-2022-42719)

Update instructions

The problem can be corrected by updating your kernel livepatch to the following versions:

Ubuntu 20.04 LTS
aws - 91.1
azure - 91.1
gcp - 91.1
generic - 91.1
gke - 91.1
gkeop - 91.1
ibm - 91.1
lowlatency - 91.1

Ubuntu 18.04 LTS
aws - 91.1
azure - 91.1
gcp - 91.1
generic - 91.1
gke - 91.1
gkeop - 91.1
ibm - 91.1
lowlatency - 91.1

Ubuntu 22.04 LTS
aws - 91.1
azure - 91.1
gcp - 91.1
generic - 91.1
gke - 91.1
ibm - 91.1

Support Information

Kernels older than the levels listed below do not receive livepatch updates. If you are running a kernel version earlier than the one listed below, please upgrade your kernel as soon as possible.

Ubuntu 20.04 LTS
linux-aws-5.15 - 5.15.0-1000
linux-aws - 5.4.0-1009
linux-aws - 5.4.0-1061
linux-azure-5.15 - 5.15.0-1069
linux-azure - 5.4.0-1010
linux-gcp-5.15 - 5.15.0-1000
linux-gcp - 5.4.0-1009
linux-gke-5.15 - 5.15.0-1000
linux-gke - 5.4.0-1033
linux-gkeop - 5.4.0-1009
linux-hwe - 5.15.0-0
linux-ibm-5.15 - 5.15.0-1000
linux-ibm - 5.4.0-1009
linux-oem - 5.4.0-26
linux - 5.4.0-26

Ubuntu 18.04 LTS
linux-aws-5.4 - 5.4.0-1069
linux-aws - 4.15.0-1054
linux-aws - 4.15.0-1119
linux-azure-4.15 - 4.15.0-1115
linux-azure-5.4 - 5.4.0-1069
linux-gcp-4.15 - 4.15.0-1121
linux-gcp-5.4 - 5.4.0-1069
linux-gke-4.15 - 4.15.0-1076
linux-gke-5.4 - 5.4.0-1009
linux-gkeop-5.4 - 5.4.0-1007
linux-hwe-5.4 - 5.4.0-26
linux-ibm-5.4 - 5.4.0-1009
linux-oem - 4.15.0-1063
linux - 4.15.0-69

Ubuntu 16.04 ESM
linux-aws-hwe - 4.15.0-1126
linux-aws - 4.4.0-1098
linux-aws - 4.4.0-1129
linux-azure - 4.15.0-1063
linux-azure - 4.15.0-1078
linux-azure - 4.15.0-1114
linux-gcp - 4.15.0-1118
linux-hwe - 4.15.0-143
linux-hwe - 4.15.0-69
linux - 4.4.0-168
linux - 4.4.0-211

Ubuntu 22.04 LTS
linux-aws - 5.15.0-1000
linux-azure - 5.15.0-1000
linux-gcp - 5.15.0-1000
linux-gke - 5.15.0-1000
linux-ibm - 5.15.0-1000
linux - 5.15.0-24
linux - 5.15.0-25

Ubuntu 14.04 ESM
linux-lts-xenial - 4.4.0-168

References

- CVE-2022-41222
- CVE-2022-42719