[LSN-0087-1] 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 16.04 ESM – Ubuntu 22.04 LTS – Ubuntu 14.04 ESM
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 – linux-oem – Linux kernel for OEM systems
Details
Aaron Adams discovered that the netfilter subsystem in the Linux kernel did not properly handle the removal of stateful expressions in some situations, leading to a use-after-free vulnerability. A local attacker could use this to cause a denial of service (system crash) or execute arbitrary code. (CVE-2022-1966)
Ziming Zhang discovered that the netfilter subsystem in the Linux kernel did not properly validate sets with multiple ranged fields. A local attacker could use this to cause a denial of service or execute arbitrary code. (CVE-2022-1972)
Update instructions
The problem can be corrected by updating your kernel livepatch to the following versions:
Ubuntu 20.04 LTS aws – 87.1 azure – 87.1 gcp – 87.1 generic – 87.1 gke – 87.1 gkeop – 87.1 ibm – 87.1 lowlatency – 87.1
Ubuntu 18.04 LTS aws – 87.1 aws – 87.2 azure – 87.1 gcp – 87.1 generic – 87.1 gke – 87.1 gkeop – 87.1 lowlatency – 87.1 oem – 87.1
Ubuntu 16.04 ESM aws – 87.1 azure – 87.1 gcp – 87.1 generic – 87.1 lowlatency – 87.1
Ubuntu 22.04 LTS gcp – 87.1 generic – 87.1 gke – 87.1 ibm – 87.1 lowlatency – 87.1
Ubuntu 14.04 ESM generic – 87.1 lowlatency – 87.1
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 – 5.4.0-1009 linux-azure – 5.4.0-1010 linux-gcp – 5.4.0-1009 linux-gke – 5.4.0-1033 linux-gkeop – 5.4.0-1009 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-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-azure – 4.15.0-1063 linux-gcp – 4.15.0-1118 linux-hwe – 4.15.0-69 linux – 4.4.0-168
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
Ubuntu 14.04 ESM linux-lts-xenial – 4.4.0-168
References
– CVE-2022-1966 – CVE-2022-1972