Kernel Live Patch Security Notice LSN-0080-1

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 14.04 ESM

Summary

Several security issues were fixed in the kernel.

Software Description

– linux – Linux kernel
– 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-oem – Linux kernel for OEM systems

Details

Andy Nguyen discovered that the netfilter subsystem in the Linux kernel
contained an out-of-bounds write in its setsockopt() implementation. A
local attacker could use this to cause a denial of service (system
crash) or possibly execute arbitrary code. (CVE-2021-22555)

Update instructions

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

Ubuntu 20.04 LTS
gcp – 80.1
generic – 80.1
gke – 80.1
gkeop – 80.1
lowlatency – 80.1

Ubuntu 18.04 LTS
generic – 80.1
gke – 80.1
gkeop – 80.1
lowlatency – 80.1
oem – 80.1

Ubuntu 16.04 ESM
generic – 80.1
lowlatency – 80.1

Ubuntu 14.04 ESM
generic – 80.1
lowlatency – 80.1

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-oem – 5.4.0-26
linux – 5.4.0-26

Ubuntu 18.04 LTS
linux-aws – 4.15.0-1054
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-oem – 4.15.0-1063
linux – 4.15.0-69

Ubuntu 16.04 ESM
linux-aws – 4.4.0-1098
linux-azure – 4.15.0-1063
linux-azure – 4.15.0-1078
linux-hwe – 4.15.0-69
linux – 4.4.0-168

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

References

– CVE-2021-22555


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